Norco, LA Pollen Count
Norco, LA · Last updated Friday, November 6, 2026
This page shows the most recent reading available for Norco — from Friday, November 6, 2026 (1 day ago) — not today's reading.
Pollen Overview
Today's overall pollen level and the dominant type (trees, weeds, grass, or mold).
Total Pollen Index
The combined pollen level across all types (0–100).
Norco, LA
Weeds Index
How active weeds pollen is today (0–100).
Norco, LA
Pollen Types
Pick a pollen subtype to update the species forecast
5-Day Norco Overall Pollen Forecast
Bars are colored by severity (Low/Moderate/High).
Pollen count Norco residents check each morning
The Norco pollen count today is 22 (Low). The main driver is Ragweed, with weed pollen at 25 today. The full split is tree pollen 20, grass pollen 8, weed pollen 25. The sections below break that headline number down by plant, by day and by what the band means in practice. Pollen Atlas updated this count on Friday, November 6, 2026.
A Low band on the Pollen Atlas index means the Total Pollen Index has stayed in the lower part of the 0–100 scale. Readings in this band are built from low individual category values rather than from one large spike, and the category split above matters more than the headline number: a low total can still contain one category, such as weed pollen or mold, reading noticeably higher than the rest, which is why the split is printed on every Norco page.
Fall is ragweed season across most of the United States: ragweed plants release pollen from late summer into autumn, and weed pollen is typically the last major outdoor pollen category to fade as the weather cools. That pattern is why an autumn total is so often weed-led even when the headline number is low — tree and grass pollen have usually receded by then, leaving weed pollen, and on damp days mold, to make up most of what the index records.
To see whether today’s pollen level holds, check the 5-day Norco pollen forecast below — it is currently holding, with Friday the highest day in the window.
This is the pollen count Norco residents check each morning, built from the day’s tree, grass, weed and mold readings.
What is the Norco pollen count today?
The Norco pollen count today is 22 out of 100 (Low) on the Pollen Atlas Total Pollen Index, driven mainly by Ragweed.
Short answer for anyone searching pollen count today Norco: this page is updated every morning with the day’s modelled reading.
Norco allergies today
Norco allergies today are set by the same reading as the pollen count above: the Total Pollen Index is 22 (Low), driven mainly by Ragweed. When people ask about Norco allergies, this is the number that answers them — one daily index built from today’s tree, grass, weed and mold readings for Norco.
Allergies in Norco follow the Louisiana calendar set out below — the chapters, the plants behind them, and the 5-day forecast on this page show whether today is typical for the season or an exception to it. If you are checking allergies today in Norco before heading outdoors, the split at the top of this page is the part to read: it shows which pollen is doing the work today, not just how high the total sits.
Read the five-day table on this page as the Norco allergy forecast: today reads 22 (Low), and the day-by-day outlook shows whether Norco allergies are set to ease or build across the week — the days to plan outdoor time around are the ones where the index steps down, not just today.
In practice, the allergy count Norco today records is this same combined reading — tree, grass, weed and mold in one index.
The Norco allergy count today is 22 (Low) — the same Total Pollen Index as the pollen count above, in one combined reading.
Pollen count today Norco: the 5-day forecast
| Day | Total Pollen Index | Band |
|---|---|---|
| Friday, November 6 | 22 | Low |
| Saturday, November 7 | 22 | Low |
| Sunday, November 8 | 22 | Low |
| Monday, November 9 | 22 | Low |
| Tuesday, November 10 | 19 | Low |
Pollen Atlas forecasts Norco’s pollen count to peak on Friday at 22 (Low) over the next 5 days.
Pollen by type in Norco
What is driving Norco’s pollen today
The shape of today’s 22 (Low) is set by weed pollen at 25 (Low on its own scale) — about 47% of the four category readings added together, 5 points clear of the next category, tree pollen at 20. A weed-led total is the classic late-year shape: tree and grass pollen have usually receded, leaving weed pollen — and on damp days mold — to make up most of what the index records. Weed pollen leading in November is the Louisiana calendar working as expected — November falls in the closing weeks of the state’s weed chapter.
Plant-level detail is not in today’s feed for Norco, so the drivers have to be read from the category split above. The Louisiana guide’s account of Louisiana names an early February tree start and outdoor mold, elevated much of the year in the Gulf humidity — the pollens behind readings of this shape in this state — and the split shows how much of today’s total each category is actually carrying.
Across the five-day window the Total Pollen Index runs from 19 to 22, never changing band. Today’s 22 sits 1 point above the window’s average of 21.4 — a steady window, in which one day reads much like the next.
Plants affecting Norco now
Detailed plant-by-plant readings for Norco were not returned in today\u2019s source data, so this section summarises the pollen types the index above is built from instead of listing individual plants.
Tree pollen is one of the categories with a non-zero reading today, at 20 (Low).
Grass pollen is one of the categories with a non-zero reading today, at 8 (Low).
Weed pollen is one of the categories with a non-zero reading today, at 25 (Low).
In the Gulf & South Texas pattern, the plants that typically shape this city’s year are spring trees, warm-season grasses, late-summer ragweed and winter mountain cedar in the west of the region — named here as regional context only, not as today\u2019s measurements.
Plant detail returns here automatically on any day the source data includes it.
Every pollen type, with photos and seasons: the pollen directory.
Norco pollen through the year
The Norco pollen year runs in chapters, set by the Gulf & South Texas pattern and the Louisiana calendar. Trees come first: mountain cedar runs from December to March in the west of the region, and oak leads the spring. Grasses take the middle of the year: grasses carry the hot months, with mold close behind in the Gulf humidity. Weeds close it out: ragweed runs from August toward a mild, late finish. Outdoor mold stays elevated for much of the year in the Gulf humidity and can co-headline a reading in any month.
The Louisiana allergy season guide names an early February tree start and outdoor mold, elevated much of the year in the Gulf humidity. Duration defines Louisiana’s season: hard frosts are infrequent, so the calendar’s true low break is the briefest in the continental interior — and the AAFA’s 2025 report ranked New Orleans No. 2 of 100 metros. The CDC identifies warm, humid environments as prime mold habitat, and Louisiana’s Gulf climate is the continental interior’s clearest example.
November in Norco sits inside the weed chapter of the Louisiana year, in its closing weeks — the part of the calendar today’s readings should be judged against. Between them, the three chapters touch every month of the Louisiana year — there is no reliably empty month in this calendar. The full calendar is set out in the Louisiana allergy season guide.
How to read this index
Pollen Atlas reports the Norco pollen count on a Total Pollen Index from 0 to 100, built from separate tree, grass and weed readings. The total is a summary, not an average of the three: a single strong category can lift it, and three quiet categories can hold it down even in a month when Norco, LA pollen is usually more active. Index values are a modelled pollen risk index computed by Pollen Atlas from open weather, vegetation and phenology data, calibrated against CDC/NAB season data, with plant detail by the Google Pollen API. The index is a modelled 0–100 scale, not a measured count, and figures update through the day, so a morning and an evening visit to this page can legitimately show different numbers.
Norco in today’s national picture
At 22 (Low), Norco ranks joint 44134th of the 90896 cities Pollen Atlas tracks today — in the middle of the national table. The highest reading in the country today is Serpa, Portugal at 53, and the lowest is Galiakberovo, Russia at 5. The whole table spans 48 points today — a wide-open day, when the top and bottom of the table are effectively in different seasons.
Around Norco: New Sarpy, LA (2 miles away) reads 22 (Low); Hahnville, LA (3 miles away) reads 22 (Low); Taft, LA (3 miles away) reads 31 (Low). Norco reads exactly level with its nearest tracked neighbour today. Across Louisiana’s 489 tracked cities, today runs from 15 in Haynesville to 31 in White Castle.
Pollen totals are population numbers; symptoms are personal. The same reading can leave one Norco resident untouched and floor another, depending on which pollens they are sensitised to. If this pattern finds you every ragweed season, allergists in Norco, LA can test whether tree, grass, weed or mold is the category that matters for you — the four readings at the top of this page are the starting point for that conversation.
Norco in its local area
Across Louisiana’s 489 tracked cities, Norco ranks joint 182nd today.
Like every Pollen Atlas city page, the Norco, LA pollen count is refreshed each morning.
Nearby cities
- New Sarpy pollen count (2 miles away)
- Hahnville pollen count (3 miles away)
- Taft pollen count (3 miles away)
- Destrehan pollen count (4 miles away)
- Montz pollen count (4 miles away)
- Killona pollen count (5 miles away)
From Pollen Atlas News
See how Norco ranks in today's pollen count rankings — the worst cities for allergies today
Pollen indexes: a modelled pollen risk index computed by Pollen Atlas from open weather, vegetation and phenology data, calibrated against CDC/NAB season data. Plant detail: Google Pollen API. Index values are modelled, not measured counts. Sources: CDC/NAB; USA-NPN; GBIF (CC BY); ESA WorldCover (CC BY 4.0).