https://www.pollenatlas.com/allergists2026-10-17https://www.pollenatlas.com/allergens/dock-sorrel2026-10-19https://www.pollenatlas.com/news2026-10-19https://www.pollenatlas.com/news/ragweed-season2026-10-15https://www.pollenatlas.com/images/blog/ragweed-season-common-ragweed.jpgCommon Ragweed in FlowerCommon ragweed, Ambrosia artemisiifolia, flowering in late summer. A single plant can release a billion pollen grains in a season, making ragweed the dominant fall allergen across North America.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/ragweed-season-giant-ragweed.jpgGiant Ragweed by the WaterGiant ragweed growing beside a river. Taller and coarser than common ragweed, Ambrosia trifida thrives on disturbed, damp ground — exactly the habitat riverbanks and field edges provide.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/ragweed-season-fall-field.jpgA Field Ready for FallAn open field in late summer, the kind of ground where ragweed thrives. Ragweed pollen peaks from late August through September, when day length shortens and the plants flower all at once.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/news/cedar-fever2026-10-15https://www.pollenatlas.com/images/blog/cedar-fever-texas-hill-country.jpgThe Texas Hill Country in WinterThe juniper-dotted hills of central Texas in winter. Ashe juniper, the tree behind cedar fever, releases enormous pollen clouds from December into February across the Hill Country.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/cedar-fever-ashe-juniper.jpgAshe Juniper FoliageClose-up of Ashe juniper foliage. The male cones of Juniperus ashei shed the pollen that drifts for miles on winter winds, carrying it into Austin, San Antonio and Dallas.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/news/what-is-a-pollen-count2026-10-15https://www.pollenatlas.com/images/blog/what-is-a-pollen-count-pollen-grains.jpgPollen Grains Under the MicroscopePollen grains under a microscope. A pollen count is the number of grains per cubic metre of air, identified by technicians who recognise each species by its sculpted surface.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/what-is-a-pollen-count-counting-station.jpgA Pollen Counting StationA volumetric pollen trap on a rooftop. Certified counting stations sample the air continuously, and the daily count is the average concentration over 24 hours.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/images/blog/what-is-a-pollen-count-forecast-map.jpgA Pollen Forecast MapA pollen forecast map. Forecasts combine yesterday's count with weather data — wind, rain and temperature — to predict what the air will carry tomorrow.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/news/worst-cities-for-allergies2026-10-15https://www.pollenatlas.com/images/blog/worst-cities-for-allergies-city-skyline.jpgA City Skyline at DuskA city skyline at dusk. The worst allergy cities combine heavy tree cover, long growing seasons and geography that traps pollen in place.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/worst-cities-for-allergies-suburban-street.jpgA Tree-Lined Suburban StreetA tree-lined suburban street in spring. The same street trees that make neighbourhoods beautiful — oak, maple, birch — are the biggest pollen producers.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/news/pollen-forecast-vs-pollen-count2026-10-15https://www.pollenatlas.com/images/blog/pollen-forecast-vs-pollen-count-morning-coffee.jpgMorning Coffee Before Checking the ForecastA morning coffee before checking the day's pollen forecast. The count tells you what yesterday's air held; the forecast tells you what to do before you head out.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/pollen-forecast-vs-pollen-count-weather-vane.jpgA Weather Vane Against the SkyA weather vane against the sky. Wind direction and speed decide where today's pollen lands — a forecast that ignores the wind is just a count with confidence.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/news/tree-pollen-season2026-10-15https://www.pollenatlas.com/images/blog/tree-pollen-season-oak-catkins.jpgOak Catkins Shedding PollenOak catkins shedding pollen in spring. Oaks are the heavyweight champions of tree pollen season, with a single tree capable of releasing millions of grains a day.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/tree-pollen-season-birch-forest.jpgA Birch Forest in SpringA birch forest in early spring. Birch pollen is among the most allergenic tree pollens, and its season overlaps with oak across much of the northern United States.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/images/blog/tree-pollen-season-maple-flowers.jpgMaple Flowers in Close-UpMaple flowers in close-up. Maples flower early — often the first tree pollen of spring — and their sticky pollen travels shorter distances than oak or birch.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/tree-pollen-season-pine-forest.jpgA Pine Forest Dusting the AirA pine forest releasing its unmistakable yellow dust. Pine pollen is visible everywhere in spring, but its large, waxy grains are actually a minor allergen compared with oak and birch.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/news/grass-pollen-season2026-10-15https://www.pollenatlas.com/images/blog/grass-pollen-season-meadow-sunrise.jpgSunrise Over a Grass MeadowSunrise over a flowering grass meadow. Grasses release pollen in the morning hours, which is why counts often peak before noon on warm, dry days.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/grass-pollen-season-lawn-mower.jpgMowing the Lawn in SummerMowing a lawn in early summer. Freshly cut grass releases a burst of pollen and plant particles — mowing on a high-count day can trigger symptoms within minutes.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/images/blog/grass-pollen-season-timothy-grass.jpgTimothy Grass in FlowerTimothy grass flowering. Timothy is one of the most allergenic grasses, and its pollen cross-reacts with many other common lawn and meadow grasses.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/grass-pollen-season-soccer-field.jpgAn Empty Soccer Field in JuneAn empty soccer field in early summer. Sports fields and parks are grass pollen hotspots — evening games, after the morning release has settled, are usually easier on allergies.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/news/atlanta-pollen-count-record2026-10-15https://www.pollenatlas.com/images/blog/atlanta-pollen-count-record-skyline.jpgThe Atlanta Skyline on a Spring MorningThe Atlanta skyline on a spring morning. In March 2024 Atlanta's pollen count smashed its all-time record, topping 14,000 grains per cubic metre of air.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/atlanta-pollen-count-record-pollen-dust.jpgPollen Dust Coating a CarYellow pollen dust coating a car in Atlanta. When the count breaks records, the evidence settles on every surface — the visible sign of an invisible onslaught.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/images/blog/atlanta-pollen-count-record-oak-avenue.jpgOaks Lining an Atlanta StreetOaks lining an Atlanta street in spring. The city's legendary tree canopy is the engine of its pollen records — millions of oaks and pines flowering in the same warm weeks.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/news/phoenix-pollen2026-10-15https://www.pollenatlas.com/images/blog/phoenix-pollen-desert-sunset.jpgSunset Over the Sonoran DesertSunset over the Sonoran Desert outside Phoenix. The desert's plants — palo verde, mesquite, olive — release pollen in waves from February through May.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/phoenix-pollen-palo-verde.jpgPalo Verde in BloomPalo verde in bloom. The green-sticked tree is an icon of the Sonoran Desert — and one of Phoenix's most potent spring pollen sources.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/phoenix-pollen-oleander.jpgOleander Flowers in PhoenixOleander flowers in Phoenix. Oleander hedges line countless Phoenix streets; their showy flowers are insect-pollinated, but the sheer volume of planting still loads the air.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/images/blog/phoenix-pollen-dust-storm.jpgA Dust Storm Rolling Over PhoenixA haboob rolling over Phoenix. Summer dust storms carry pollen and mold spores for miles, and the fine dust itself irritates airways already primed by spring pollen.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/news/worst-cities-for-ragweed2026-10-15https://www.pollenatlas.com/images/blog/worst-cities-for-ragweed-belt-field.jpgGiant Ragweed Growing TallGiant ragweed, Ambrosia trifida, which can grow over three metres tall along rivers and field edges in the Midwest and South. The ragweed belt produces the country's highest fall pollen counts.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/worst-cities-for-ragweed-midwest-plains.jpgKansas Farmland Under a Big SkyKansas farmland. The Midwest and central plains sit at the heart of ragweed country, where fields, roadsides and river bottoms all carry the plant.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/worst-cities-for-ragweed-south-valley.jpgThe Meandering Mississippi RiverThe Mississippi River winding through the South. Southern ragweed seasons start earlier and run later than northern ones, trading peak intensity for extra weeks.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/images/blog/worst-cities-for-ragweed-fall-roadside.jpgCanada Goldenrod in SeedCanada goldenrod going to seed in autumn. Showy goldenrod is often blamed for fall allergies, but insect-pollinated goldenrod is mostly innocent — wind-pollinated ragweed, flowering at the same time, is the real culprit.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/news/texas-allergy-season2026-10-15https://www.pollenatlas.com/images/blog/texas-allergy-season-bluebonnet-field.jpgTexas Bluebonnets in BloomTexas bluebonnets in spring. Bluebonnets are insect-pollinated and rarely cause allergies — the spring misery in Texas comes from oak and other wind-pollinated trees flowering at the same time.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/texas-allergy-season-austin-skyline.jpgThe Austin Skyline in 2026Downtown Austin, Texas. Austin sits at the edge of the Hill Country's juniper brakes, downwind of the winter cedar pollen that makes its allergy season famous.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/images/blog/texas-allergy-season-fall-field.jpgSunset at Port Aransas, TexasSunset at Port Aransas on the Texas coast. Even coastal Texas gets a fall ragweed season, though Gulf breezes regularly flush the air and give ragweed sufferers a break.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/news/oklahoma-allergy-season2026-10-15https://www.pollenatlas.com/images/blog/oklahoma-allergy-season-tallgrass-prairie.jpgBison on the Tallgrass PrairieA bison on the Tall Grass Prairie Preserve in Oklahoma. The prairie's grasses, and the ragweed that follows them in fall, shape Oklahoma's long allergy calendar.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/oklahoma-allergy-season-tulsa-skyline.jpgDowntown Tulsa at NightDowntown Tulsa at night, seen from Chandler Park. Tulsa regularly ranks among America's worst allergy cities, with strong tree, grass and ragweed seasons back to back.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/news/spring-allergy-season2026-10-15https://www.pollenatlas.com/images/blog/spring-allergy-season-blossom-avenue.jpgCherry Blossoms on Heerstrasse, BonnCherry blossoms lining Heerstrasse in Bonn. Spring allergy season moves north with the bloom — tree pollen peaks in the South in March and in northern cities weeks later.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/spring-allergy-season-oak-forest-wave.jpgThe Forested Slopes of Oak MountainThe forested slopes of Oak Mountain, Alabama, in spring green. The first wave of spring allergy season is tree pollen, led by oak across most of the eastern United States.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/spring-allergy-season-grass-meadow-wave.jpgSpring Flowers in Boston's Back BaySpring flowers in Boston's Back Bay. As tree pollen fades in late spring, grass pollen rises — the second wave of the season, overlapping the first in most cities.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/news/pollen-season-calendar2026-10-15https://www.pollenatlas.com/images/blog/pollen-season-calendar-oak-tree-summer.jpgA Southern Live Oak in Columbia, South CarolinaA mature southern live oak spreading over a lawn in Columbia, South Carolina. One calendar runs the whole U.S. pollen year — winter cedar, spring trees, summer grass, fall ragweed — but every region reads it on its own schedule.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/pollen-season-calendar-winter-juniper-frost.jpgJuniper Berries and Leaves in the Sierra NevadaBerries and leaves of a juniper in Spain's Sierra Nevada. Junipers are the exception in the winter calendar: while most plants rest, cedar-family pollen peaks from December to February.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/images/blog/pollen-season-calendar-fall-meadow.jpgA Meadow Below a Rocky ArchA meadow below a natural arch. By fall the meadow's grasses are done, and the calendar turns to ragweed and mold until the first frost closes the year.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/news/mold-allergies-in-fall2026-10-19https://www.pollenatlas.com/images/blog/mold-allergies-in-fall-fallen-leaves.jpgFallen Leaves on a Forest FloorFallen leaves carpeting a forest floor in autumn. As leaf litter piles up and stays damp, mold colonies grow through it and release spores — the hidden half of fall allergies that has nothing to do with ragweed.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/mold-allergies-in-fall-fungi-log.jpgMushrooms and a Maple Leaf, Potawatomi State ParkSmall mushrooms fruiting on the forest floor at Potawatomi State Park, Wisconsin, beside a fallen maple leaf. Fungi like these are the visible tip of the mold network digesting autumn's leaves — and seeding the air with spores.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/mold-allergies-in-fall-leaf-pile.jpgA Rake Beside an Autumn Leaf PileA rake and a fresh pile of autumn leaves. Raking is peak mold exposure: every turn of the pile throws spores that have been growing in the damp litter straight into the air at face height.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/news/dust-mite-allergy2026-10-15https://www.pollenatlas.com/images/blog/dust-mite-allergy-bed-bedding.jpgA Bright White BedroomA bright bedroom with fresh white bedding. Beds are dust mite headquarters — warm, humid and full of shed skin — which is why mite-proof encasings and a hot weekly wash are the first line of defense against dust mite allergy.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/images/blog/dust-mite-allergy-micrograph.jpgA Dust Mite, Electron MicrographA female house dust mite in a CSIRO scanning electron micrograph. Dust mites are microscopic relatives of spiders living in bedding and carpets; their waste particles — not the mites themselves — are the allergen most people react to.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/dust-mite-allergy-vacuuming-carpet.jpgVacuuming a Floor at HomeVacuuming a floor at home. Regular vacuuming with a sealed HEPA machine removes the carpet reservoir where dust mite allergen accumulates — though it briefly stirs particles into the air while you clean.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/news/pet-dander-allergy2026-10-15https://www.pollenatlas.com/images/blog/pet-dander-allergy-cat-at-home.jpgA Black Cat Curled Up on a SofaA black cat curled up on a sofa in Newcastle upon Tyne, England. Cat allergen spreads from the sofa to the whole house on clothing and air currents — pet dander allergy is a whole-home exposure, not a petting problem.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/pet-dander-allergy-dog-at-home.jpgPortrait of an English BulldogAn English bulldog. Dog dander collects in the rooms a dog actually uses, and breeds differ less in allergen output than marketing suggests — no dog is truly hypoallergenic.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/pet-dander-allergy-cat-furniture.jpgA Cat Lounging on a SofaA cat making itself comfortable on a sofa. Cat allergen is especially sticky and light, spreading through a home on clothing and air currents and settling on every soft surface.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/news/pollen-and-wildfire-smoke2026-10-15https://www.pollenatlas.com/images/blog/pollen-and-wildfire-smoke-forest-fire.jpgFlames From the Pika Fire, Yosemite, 2023Flames from the Pika Fire in Yosemite National Park, July 2023. Wildfire seasons now overlap pollen seasons across the West, stacking smoke particles on top of peak pollen weeks.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/images/blog/pollen-and-wildfire-smoke-hazy-skyline.jpgWildfire Haze Hiding ManhattanManhattan disappearing into orange haze during the 2023 Canadian wildfire smoke event. Smoke days push particle pollution to levels that irritate even non-allergic airways — and they can arrive in the middle of pollen season.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/pollen-and-wildfire-smoke-smoky-sunset.jpgThe Sun Seen Through Wildfire SmokeThe sun seen through wildfire smoke. Smoke particles are far smaller than pollen grains and penetrate deep into the lungs; smoke can also rupture pollen grains into fragments that do the same.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/news/how-pollen-counts-are-measured2026-10-15https://www.pollenatlas.com/images/blog/how-pollen-counts-are-measured-rooftop-station.jpgInstrument Tower on the National Weather Bureau RoofThe instrument tower and enclosures on the roof of the National Weather Bureau building in Washington, D.C. (Harris & Ewing, 1913–1918). Pollen counting stations have worked from rooftops like this for a century — the traps sit above street level, sampling the air everyone below breathes.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/images/blog/how-pollen-counts-are-measured-sampler-device.jpgAn EPA Technician Holding a Portable Air Sampler, 1970sAn EPA technician holding a portable air sampler in Las Vegas in the 1970s (National Archives). Field samplers collect the air; the counting itself happens back in the lab, grain by grain, under a microscope.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/news/allergy-map2026-10-19https://www.pollenatlas.com/news/are-allergies-bad-right-now2026-10-15https://www.pollenatlas.com/news/pollen-count-time-of-day2026-10-15https://www.pollenatlas.com/news/history-of-pollen2026-10-15https://www.pollenatlas.com/news/bees-and-pollen2026-10-15https://www.pollenatlas.com/news/charles-blackley-hay-fever2026-10-15https://www.pollenatlas.com/news/thunderstorm-asthma-melbourne-20162026-10-15https://www.pollenatlas.com/news/forensic-pollen2026-10-15https://www.pollenatlas.com/news/pollen-grains-under-a-microscope2026-10-15https://www.pollenatlas.com/news/local-honey-and-allergies2026-10-15https://www.pollenatlas.com/news/botanical-sexism2026-10-15https://www.pollenatlas.com/news/oak-pollen2026-10-15https://www.pollenatlas.com/news/birch-pollen2026-10-15https://www.pollenatlas.com/news/pine-pollen2026-10-19https://www.pollenatlas.com/news/mulberry-pollen2026-10-15https://www.pollenatlas.com/news/olive-pollen2026-10-19https://www.pollenatlas.com/news/elm-pollen2026-10-15https://www.pollenatlas.com/news/maple-pollen2026-10-15https://www.pollenatlas.com/news/juniper-pollen2026-10-15https://www.pollenatlas.com/news/bermuda-grass-pollen2026-10-15https://www.pollenatlas.com/news/timothy-grass-pollen2026-10-15https://www.pollenatlas.com/news/pigweed-and-tumbleweed-pollen2026-10-15https://www.pollenatlas.com/news/ragweed-plant2026-10-15https://www.pollenatlas.com/news/does-rain-wash-away-pollen2026-10-15https://www.pollenatlas.com/news/pollen-and-cold-fronts2026-10-15https://www.pollenatlas.com/news/climate-change-and-pollen-seasons2026-10-15https://www.pollenatlas.com/news/christmas-tree-syndrome2026-10-15https://www.pollenatlas.com/news/winter-allergies2026-10-15https://www.pollenatlas.com/news/fall-allergies2026-10-15https://www.pollenatlas.com/news/indoor-mold-allergy2026-10-15https://www.pollenatlas.com/news/houseplants-and-allergies2026-10-15https://www.pollenatlas.com/news/cat-dander-vs-dog-dander2026-10-15https://www.pollenatlas.com/news/desert-dust-allergies2026-10-19https://www.pollenatlas.com/news/air-quality-index-and-allergies2026-10-19https://www.pollenatlas.com/news/first-frost-and-pollen2026-10-16https://www.pollenatlas.com/news/alternaria-mold2026-10-16https://www.pollenatlas.com/news/dock-sorrel-pollen2026-10-19https://www.pollenatlas.com/news/worst-states-for-allergies2026-10-16https://www.pollenatlas.com/news/florida-allergy-season2026-10-19https://www.pollenatlas.com/news/best-places-to-live-with-allergies2026-10-19https://www.pollenatlas.com/news/september-allergies2026-10-16https://www.pollenatlas.com/news/new-york-allergy-season2026-10-16https://www.pollenatlas.com/news/adult-onset-allergies2026-10-17https://www.pollenatlas.com/news/is-it-allergy-season2026-10-17https://www.pollenatlas.com/news/cottonwood-pollen2026-10-17https://www.pollenatlas.com/images/blog/cottonwood-pollen-fluff-on-branch.jpgPoplar Cotton Shedding From the BranchSeed capsules of a hybrid black poplar (Populus × canadensis) shedding their cotton in Vinnytsia, Ukraine. Cottonwoods do the same across the American West each late spring — the fluff is seed transport, released weeks after the tree's real pollen.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/images/blog/cottonwood-pollen-male-catkins.jpgMale Cottonwood CatkinsMale catkins of a plains cottonwood (Populus deltoides subsp. monilifera). Only male cottonwoods make pollen, and they shed it in early spring — the invisible first act, long before female trees release their seed cotton.https://creativecommons.org/licenses/by/3.0/us/https://www.pollenatlas.com/images/blog/cottonwood-pollen-riverside-trees.jpgCottonwoods Along the Arkansas RiverMature plains cottonwoods along the Arkansas River in south-central Colorado. Cottonwoods follow water across the dry West, so their pollen map is drawn by rivers — and by the towns that grew up beside them.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/news/chicago-mold-count2026-10-17https://www.pollenatlas.com/news/ryegrass-pollen2026-10-17https://www.pollenatlas.com/news/arizona-allergy-season2026-10-17https://www.pollenatlas.com/news/california-allergy-season2026-10-17https://www.pollenatlas.com/news/north-carolina-allergy-season2026-10-17https://www.pollenatlas.com/news/june-pollen2026-10-17https://www.pollenatlas.com/news/pecan-pollen2026-10-17https://www.pollenatlas.com/images/blog/pecan-pollen-tree-canopy-spring.jpgPecan Tree Canopy in SpringA mature pecan tree (Carya illinoinensis) in fresh spring leaf at the Dawes Arboretum in Ohio. Pecan is the South's cultivated hickory, and its April pollen peak stacks on top of oak across the Gulf states.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/pecan-pollen-catkins-closeup.jpgPecan Catkins, Up CloseMale pecan catkins hanging in clusters as the leaves unfold. Each catkin releases pollen into spring air; pecan grains are relatively heavy, so the heaviest exposure falls close to the trees themselves.https://creativecommons.org/licenses/by/3.0/us/https://www.pollenatlas.com/images/blog/pecan-pollen-orchard-new-mexico.jpgPecan Grove in La Luz, New MexicoA working pecan grove in La Luz, New Mexico, where orchard rows run for miles. In orchard country the trees stand in formation, and spring pollen exposure rises and falls with the whole block at once.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/news/mugwort-pollen2026-10-17https://www.pollenatlas.com/news/michigan-allergy-season2026-10-17https://www.pollenatlas.com/news/georgia-allergy-season2026-10-17https://www.pollenatlas.com/news/poplar-pollen2026-10-17https://www.pollenatlas.com/news/ash-pollen2026-10-17https://www.pollenatlas.com/images/blog/ash-pollen-flowering-manna-ash.jpgManna Ash in Full FlowerManna ash (Fraxinus ornus) in full flower above Lake Garda in Lombardy, Italy — the ash family's showiest bloomer. North American ashes flower far more quietly, in small clusters on bare branches, but open the spring tree season the same way.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/images/blog/ash-pollen-lilac-flowers.jpgLilac in BloomCommon lilac (Syringa vulgaris) in bloom. Lilac belongs to the same olive family as ash and olive, and its pollen proteins are close molecular cousins of the major ash allergen — the reason reactions can run across the whole family.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/images/blog/ash-pollen-emerald-ash-borer.jpgEmerald Ash Borer, Close UpAn adult emerald ash borer (Agrilus planipennis) photographed in Occoquan Regional Park, Virginia. The invasive beetle's larvae tunnel under ash bark, and it has killed tens of millions of North American ash trees — steadily redrawing the ash pollen map.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/news/goldenrod-pollen2026-10-17https://www.pollenatlas.com/news/nettle-pollen2026-10-17https://www.pollenatlas.com/news/alder-pollen2026-10-17https://www.pollenatlas.com/images/blog/alder-pollen-red-alder-catkins.jpgRed Alder Catkins in Late WinterMale catkins of a red alder (Alnus rubra), photographed in the Pacific Northwest. Red alder flowers before its leaves — and before almost everything else — opening the birch family's long pollen relay.https://creativecommons.org/licenses/by/2.5/https://www.pollenatlas.com/images/blog/alder-pollen-black-alder-catkins.jpgBlack Alder CatkinsMale catkins of a black alder (Alnus glutinosa) clustered thick on bare twigs. Alders across the genus flower on last year's wood in late winter, weeks ahead of the leaves — the earliest move in the birch family's season.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/images/blog/alder-pollen-seed-cones.jpgRed Alder Seed ConesThe woody seed cones of a red alder — last season's female catkins, ripened into miniature pinecones. The cones hang through winter shedding seed, one of the ways this fast, nitrogen-fixing tree feeds the forest around it.https://creativecommons.org/licenses/by/2.5/https://www.pollenatlas.com/news/sycamore-pollen2026-10-17https://www.pollenatlas.com/images/blog/sycamore-pollen-mature-tree-trunk.jpgAmerican Sycamore, Looking UpA mature American sycamore (Platanus occidentalis) in Rock Creek Park, Washington, DC, its camouflage bark peeling in olive and cream patches. Planted by the million as a street tree, sycamore flowers in the heart of the spring surge.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/sycamore-pollen-seed-balls-branches.jpgSycamore Seed Balls on the BranchSeed balls hanging from the pale branches of an American sycamore. Plane trees carry their round fruit balls on long stalks through winter — the easiest way to name the tree long after its spring flowers are gone.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/sycamore-pollen-camouflage-bark.jpgSycamore Bark, Up CloseThe exfoliating bark of an American sycamore in Leesylvania State Park, Virginia, flaking away in olive, tan and cream plates. No other common street tree wears camouflage like it — the fastest field mark there is.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/news/saharan-dust-allergies2026-10-17https://www.pollenatlas.com/news/colorado-allergy-season2026-10-17https://www.pollenatlas.com/news/nevada-allergy-season2026-10-17https://www.pollenatlas.com/news/ohio-allergy-season2026-10-17https://www.pollenatlas.com/news/minnesota-allergy-season2026-10-17https://www.pollenatlas.com/news/virginia-allergy-season2026-10-17https://www.pollenatlas.com/news/april-allergies2026-10-17https://www.pollenatlas.com/news/hickory-pollen2026-10-17https://www.pollenatlas.com/news/mesquite-pollen2026-10-17https://www.pollenatlas.com/news/highest-pollen-count-ever2026-10-17https://www.pollenatlas.com/news/willow-pollen2026-10-17https://www.pollenatlas.com/images/blog/willow-pollen-weeping-willows-stream.jpgWeeping Willows Along the StreamGolden weeping willows (Salix × sepulcralis 'Chrysocoma') lining a stream in early spring. Willows crowd waterways across the country, and their catkins open among the first flowers of the year.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/willow-pollen-pussy-willow-catkins.jpgPussy Willow CatkinsMale catkins of a goat willow (Salix caprea), still in their silvery pussy-willow stage. Willow catkins are built for two delivery systems at once: insects work them for nectar and pollen, and the wind takes a share as well.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/images/blog/willow-pollen-catkins-over-water.jpgWillow Catkins Over the WaterA golden weeping willow's branches hanging over a stream in March, new leaves and catkins opening together. Riverside willows like this one put their pollen directly over the paths, towpaths and banks people walk in spring.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/news/sweetgum-pollen2026-10-17https://www.pollenatlas.com/images/blog/sweetgum-pollen-tree-spring-leaves.jpgSweet Gum in Spring LeafAn American sweetgum (Liquidambar styraciflua) in the Jardin de Diane at Fontainebleau, France, its star-shaped leaves fresh and its branches carrying young fruit balls. In its native Southeast the same tree flowers unnoticed each spring.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/sweetgum-pollen-spiky-gumballs.jpgYoung Gumballs on the BranchYoung fruit balls of an American sweetgum in Brookfield Stream Reserve, Auckland, New Zealand. The spiky ‘gumballs’ start green and ripen into the woody burrs that litter pavements all winter — the tree’s unmistakable signature.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/images/blog/sweetgum-pollen-fall-color-canopy.jpgSweet Gum in Autumn ColourA sweetgum in the University of Ljubljana Botanical Garden, Slovenia, turned gold for autumn. Learning the tree by its famous fall colour is the easiest way to know exactly which tree to watch when spring comes.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/news/sagebrush-pollen2026-10-17https://www.pollenatlas.com/images/blog/sagebrush-pollen-steppe-mountains.jpgSagebrush Steppe Below the Wind River RangeSagebrush steppe in Wyoming below the snow-capped Wind River Range, photographed by the Bureau of Land Management. Big sagebrush dominates some 100 million acres of the dry West — and its late-season pollen rides the same open country.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/sagebrush-pollen-flower-spikes.jpgBig Sagebrush Flower SpikesFlowering spikes of big sagebrush (Artemisia tridentata) at 7,000 feet in Swall Meadows, Mono County, California. The tiny wind-pollinated flowers open from late summer into fall — a whole season after the spring trees have finished.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/sagebrush-pollen-big-sagebrush-nevada.jpgBig Sagebrush at Washoe Lake, NevadaA big sagebrush at Washoe Lake State Park, Nevada, its spent flower stalks still standing. Sagebrush country is read by shrub, basin and range — where the grey-green brush runs unbroken, its pollen runs with it.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/news/hackberry-pollen2026-10-17https://www.pollenatlas.com/news/tennessee-allergy-season2026-10-17https://www.pollenatlas.com/news/orchard-grass-pollen2026-10-17https://www.pollenatlas.com/news/johnson-grass-pollen2026-10-17https://www.pollenatlas.com/news/japan-pollen-season2026-10-17https://www.pollenatlas.com/news/kansas-allergy-season2026-10-17https://www.pollenatlas.com/news/illinois-allergy-season2026-10-17https://www.pollenatlas.com/news/louisiana-allergy-season2026-10-17https://www.pollenatlas.com/news/northeast-allergy-season2026-10-17https://www.pollenatlas.com/news/english-plantain-pollen2026-10-17https://www.pollenatlas.com/images/blog/english-plantain-pollen-flower-spike.jpgEnglish Plantain Flower SpikeA ribwort plantain flower spike (Plantago lanceolata) photographed in Germany, its ring of white stamens open partway up the spike. The flowers mature in a travelling band, so one plant sheds pollen in instalments for weeks.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/images/blog/english-plantain-pollen-rosette-leaves.jpgEnglish Plantain RosetteThe flat rosette of an English plantain in Aveyron, France, its lance-shaped leaves ribbed with parallel veins. The rosette hugs the ground beneath the mower's blades while the flower spikes duck and spring back — the architecture of a permanent lawn weed.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/images/blog/english-plantain-pollen-spike-anthers.jpgPlantain Spike, Macro ViewA macro view of a ribwort plantain spike with its anthers dangling on fine threads. Each morning's fresh ring of anthers sheds a little more pollen — the slow drip that keeps plantain in the air between grass season and ragweed.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/news/dock-sorrel-pollen-season2026-10-19https://www.pollenatlas.com/images/blog/dock-sorrel-pollen-red-sorrel-meadow.jpgSheep Sorrel Meadow in FlowerSheep sorrel (Rumex acetosella) flowering across a meadow, its wiry stalks flushed red. Sorrels and docks in the Rumex genus produce the look-alike grains that pollen counters report together as the dock sorrel mix.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/dock-sorrel-pollen-curly-dock-plant.jpgCurly Dock in FlowerCurly dock (Rumex crispus), the tallest of the common docks, carrying its flowers on a dense upright stalk. Dock pollen grains are so similar to sorrel grains under the microscope that counting stations group the whole genus together.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/images/blog/dock-sorrel-pollen-sheep-sorrel-stalk.jpgSheep Sorrel Flowering StalkA sheep sorrel flowering stalk photographed in Hesse, Germany, its tiny reddish blooms spaced along a wiry stem. Sheep sorrel flowers over an exceptionally long window, which is why the dock sorrel mix shows up across so much of the weed season.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/news/chestnut-pollen2026-10-18https://www.pollenatlas.com/images/blog/chestnut-pollen-sweet-chestnut-bloom.jpgSweet Chestnut Catkins in Full BloomSweet chestnut (Castanea sativa) in full flower, its long creamy catkins — the pollen-bearing flowers of the chestnut genus — standing out against a summer sky. The American chestnut's own bloom looked much the same before the blight emptied it from the eastern forest.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/images/blog/chestnut-pollen-american-chestnut-tree.jpgSurviving American Chestnut TreeA mature American chestnut (Castanea dentata) growing in Nova Scotia, Canada, well beyond the blight's Appalachian stronghold. Survivors like this one — together with backcross breeding programs — carry the species' genes, and its pollen, toward a possible restoration.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/chestnut-pollen-blight-fruiting-bark.jpgChestnut Blight Fruiting Bodies on BarkThe chestnut blight fungus (Cryphonectria parasitica) fruiting on chestnut bark, its orange spore-bearing structures erupting through the cankered surface. Arriving in New York in 1904, the fungus girdled and killed billions of American chestnuts within fifty years.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/news/privet-pollen2026-10-19https://www.pollenatlas.com/images/blog/privet-pollen-hedge-white-bloom.jpgPrivet Hedge in Full White BloomChinese privet (Ligustrum sinense) flowering in a solid wall of white bloom. Privets planted as hedges and screens across the South release far heavier pollen loads each spring than their tidy reputation suggests.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/privet-pollen-flower-cluster-closeup.jpgPrivet Flower Cluster Close-UpEuropean privet (Ligustrum vulgare) flower clusters opening in late spring, each tiny four-petalled flower packed with pollen-bearing anthers. Privet belongs to the olive family, and its pollen shares proteins with olive and ash pollen.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/images/blog/privet-pollen-street-tree-bloom.jpgGlossy Privet Tree in BloomA glossy privet (Ligustrum lucidum) grown as a street tree, its canopy dusted with pale flower clusters. Planted for evergreen screens and shade across southern cities, tree-form privets lift a whole hedge's worth of flowers into the air at once.https://creativecommons.org/licenses/by/2.5/https://www.pollenatlas.com/news/beech-pollen2026-10-18https://www.pollenatlas.com/images/blog/beech-pollen-trunk-into-spring-canopy.jpgAmerican Beech Trunk and Spring CanopyLooking up the smooth, steel-gray trunk of an American beech (Fagus grandifolia) into its fresh spring canopy. Beech flowers open with the new leaves, and its pollen joins the oak family's spring tree mix across the eastern forest.https://creativecommons.org/publicdomain/mark/1.0/https://www.pollenatlas.com/images/blog/beech-pollen-gray-trunks-winter-woods.jpgAmerican Beech Trunks in Winter WoodsAmerican beech trunks in a winter forest, their smooth pale-gray bark unmistakable even without a single leaf. That bark is the beech's year-round field mark — and part of why the tree is so easy to pick out of the spring pollen crowd.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/beech-pollen-spring-hardwood-forest.jpgBeech in Spring Hardwood ForestA spring hardwood forest of American beech and sugar maple in fresh green leaf. Beech flowers as the canopy closes in April and May, releasing a modest but steady share of the eastern forest's spring tree pollen.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/news/fescue-pollen2026-10-18https://www.pollenatlas.com/images/blog/fescue-pollen-flowering-grass-field.jpgTall Fescue Dominated Field in FlowerA grass field dominated by tall fescue (Schedonorus arundinaceus) in full flower, seed heads up across the whole stand. Tall fescue blankets pastures across the American transition zone, and a field flowering like this is a grass-pollen peak at ground level.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/fescue-pollen-tall-fescue-tussock.jpgTall Fescue TussockA single tussock-forming clump of tall fescue, the deep-rooted perennial that took over the transition zone's pastures after its 1931 discovery on a Kentucky hillside. One mature plant carries dozens of flowering stems in late spring.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/fescue-pollen-seed-head-against-sky.jpgTall Fescue Seed Head in FlowerA tall fescue (Festuca arundinacea) seed head in flower against the sky, its spikelets open and anthers exposed to the wind. Fescue pollen is a classic grass pollen — near enough to bluegrass and ryegrass pollen that counts and tests treat them as kin.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/news/saltbush-pollen2026-10-18https://www.pollenatlas.com/images/blog/saltbush-pollen-shrub-desert-mountains.jpgSaltbush in Desert ScrubA fourwing saltbush (Atriplex canescens) holding its ground in rocky desert scrub in the Southwest, mountain ranges behind. Saltbushes are built for saline, drought-baked soils where few other shrubs survive — and their fall pollen season matches that hard country.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/images/blog/saltbush-pollen-fourwing-fruit.jpgFourwing Saltbush Winged FruitThe winged fruits of fourwing saltbush (Atriplex canescens), each seed wrapped in the four papery wings that give the species its name. The wings belong to the female plants; the pollen comes from separate male plants flowering in the same stand.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/saltbush-pollen-male-flower-spikes.jpgSaltbush Male Flower SpikesMale flower spikes of fourwing saltbush (Atriplex canescens) in close-up — the pale clusters that release the plant's pollen into the fall air. Saltbush is one of the West's signature autumn weed pollens, peaking as the summer grasses fade.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/news/kochia-pollen2026-10-18https://www.pollenatlas.com/images/blog/kochia-pollen-red-autumn-hillside.jpgKochia in Autumn RedKochia (Bassia scoparia) in its autumn red, shown in a planted display at Hitachi Seaside Park in Japan. The same plant runs feral across the North American plains as a tumbleweed — and it wears this same fall color as its pollen season winds down.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/kochia-pollen-weedy-thicket.jpgKochia Growing WildKochia (Bassia scoparia) growing wild in a dense, weedy thicket, its feathery green foliage hiding the small flowers that produce its pollen. Introduced to North America as an ornamental and forage plant, kochia escaped cultivation and now colonizes fields, rail lines and waste ground across the plains.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/kochia-pollen-stand-mountain-west.jpgKochia Stand in the Mountain WestA stand of kochia (Bassia scoparia) growing tall beside water in Utah, with mountain ranges behind. Across the plains and the mountain West, kochia's late-summer pollen registers in the weed counts alongside its tumbleweed kin.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/news/cocklebur-pollen2026-10-18https://www.pollenatlas.com/images/blog/cocklebur-pollen-plant-young-burs.jpgCocklebur Plant With Young BursCommon cocklebur (Xanthium strumarium) in late summer, its crown loaded with young spiny burs among broad, rough leaves. The burs are the plant's famous hitchhikers; the pollen — released from separate male flower heads — is the part allergy sufferers actually meet.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/cocklebur-pollen-ripe-burs-closeup.jpgRipe Cocklebur Burs Close-UpRipe cocklebur (Xanthium strumarium) burs crowding a stalk, each oval bur armored with hooked spines around the seeds inside. Built to ride fur, fleece and boot socks, the bur is how this ragweed relative conquered riverbanks and pastures worldwide.https://creativecommons.org/licenses/by/4.0/https://www.pollenatlas.com/images/blog/cocklebur-pollen-trailside-plant.jpgCocklebur Plant at TrailsideA common cocklebur (Xanthium strumarium) sprawling at the edge of a Midwestern trail in summer, right where the disturbed soil suits it. Cocklebur pollen flies in late summer on ragweed's schedule, in the same weedy places ragweed grows.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/news/brome-pollen2026-10-18https://www.pollenatlas.com/images/blog/brome-pollen-pasture-stand.jpgSmooth Brome Pasture StandSmooth brome (Bromus inermis) standing in seed in a northern pasture, its open seed heads held above the leaf canopy. Planted across the northern tier as a hay and pasture grass, smooth brome flowers in early summer and loads the air with classic grass pollen.https://creativecommons.org/publicdomain/zero/1.0/https://www.pollenatlas.com/images/blog/brome-pollen-panicle-against-sky.jpgSmooth Brome Panicle Against the SkyThe open panicle of smooth brome (Bromus inermis) against a summer sky, its slender spikelets spread wide to shed pollen to the wind. Brome arrived with the northern hay economy and never left — it now lines fields and roadsides from the Dakotas to New England.https://creativecommons.org/licenses/by/3.0/https://www.pollenatlas.com/images/blog/brome-pollen-flowering-anthers.jpgSmooth Brome Flowering AnthersSmooth brome (Bromus inermis) in flower, its yellow anthers dangling from the spikelets to release pollen. Grass flowers open like this on warm, dry early-summer mornings across the northern tier — the daily rhythm behind the brome pollen season.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/news/desert-broom-pollen2026-10-18https://www.pollenatlas.com/images/blog/desert-broom-pollen-bloom-desert-wash.jpgDesert Broom in Fall BloomDesert broom (Baccharis sarothroides) in fall bloom along a rocky wash in the Sonoran Desert, its thin green stems tipped with clouds of small creamy flowers. The shrubs flower in autumn, when their pollen joins the desert's fall weed season — and female plants follow with the famous white fluff.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/desert-broom-pollen-seed-fluff-closeup.jpgDesert Broom Seed Fluff Close-UpThe white seed fluff of a female desert broom (Baccharis sarothroides) in close-up — the cottony parachutes that drift across Tucson patios each fall. The fluff carries no pollen; that comes from separate male shrubs. But the fluff is the part of the plant everyone notices, and blames.https://creativecommons.org/licenses/by/2.0/https://www.pollenatlas.com/images/blog/desert-broom-pollen-shrub-landscape.jpgDesert Broom Shrub in BloomA desert broom (Baccharis sarothroides) shrub in bloom in open desert scrub, its fountain of thin stems carrying flower clusters at every tip. 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