Tree Pollen Count in Old Harlow, United Kingdom — Today

Updated Saturday, November 7, 2026

Pollen by type in Old Harlow

What is the tree pollen count in Old Harlow today?

The Old Harlow tree pollen index today is 19 (Low) on Pollen Atlas’s modelled 0–100 scale. Low

Modelled pollen risk index — not a measured count.

Old Harlow’s overall pollen count today is 28 (Low) across all types. See the full Old Harlow pollen count for the overall index and every type together.

Old Harlow is in Essex, England, United Kingdom. Its population is 6,968 (GeoNames).

Old Harlow Tree Pollen Count: 5-Day Forecast

DayOverall indexCategory
Saturday, November 728Low
Sunday, November 827Low
Monday, November 929Low
Tuesday, November 1018Low
Wednesday, November 1112Low

Pollen Atlas models the daily detail as an overall index: day-by-day splits by individual pollen type are not part of the modelled data, so this table shows Old Harlow’s overall trend across the week. Today’s tree pollen reading is the headline above.

Species driving Old Harlow’s tree pollen

Species-level counts are not part of the modelled data Pollen Atlas publishes — the modelled index is reported per pollen type, not per species — so this section gives the type summary: tree pollen reads 19 (Low) today. The plant-by-plant detail that is available, from the Google Pollen API, is in the next section.

Plants affecting Old Harlow now — tree pollen

Detailed plant-by-plant readings for the tree pollen category were not returned in today’s source data for Old Harlow. The type summary stands: tree pollen reads 19 (Low) today.

In the Atlantic West pattern, the plants that typically shape this city’s year are early hazel and alder, a spring birch and oak wave, late-spring and summer grasses, and a modest late-summer weed finish — named here as regional context only, not as today’s readings.

Plant detail returns here automatically on any day the feed includes it.

What this tree pollen level means

Low risk. Keep windows open; consider allergy meds only if sensitive.

Enjoy outdoor activities.

Hazel and alder can open as early as February in mild winters, and the main tree wave — birch, then oak — builds through spring to a May peak. This month sits outside the usual tree pollen window for the Atlantic West pattern, so today’s tree pollen reading is the modelled value outranking the calendar — this page reports the modelled reading first. No United Kingdom allergy season guide is published yet, so the seasonal context here follows the Atlantic West regional pattern.

Old Harlow allergies today

Old Harlow allergies today are set by the same reading as the Old Harlow pollen count today: the Total Pollen Index is 28 (Low), and the tree pollen index on this page is 19 (Low) of it. When people ask about Old Harlow allergies, this is the number that answers them — one daily modelled index built from today’s tree, grass and weed index values for Old Harlow.

Allergies in Old Harlow follow the United Kingdom calendar set out on the full Old Harlow page — the chapters, the plants behind them, and the 5-day forecast show whether today is typical for the season or an exception to it. If you are checking allergies today in Old Harlow before heading outdoors, the tree pollen split on this page is the part to read: it shows whether this pollen type is doing the work today, not just how high the total sits.

Read the five-day overall trend above as the Old Harlow allergy forecast for the tree pollen season: it shows whether Old Harlow allergies are set to ease or build across the week, day by day — the days to plan outdoor time around are the ones where the overall index steps down, not just today.

See the full Old Harlow pollen count — all types, the overall index and today’s ranking context

Old Harlow grass pollen count

Old Harlow ragweed pollen count

See how Old Harlow ranks in today's pollen count rankings — the worst cities for allergies today

See Old Harlow on the pollen map

Every pollen type, with photos and seasons: the pollen directory

Worst cities for allergies

Tree pollen season

Find an allergist in Old Harlow, United Kingdom

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).