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About Pollen in Hillingdon

Hillingdon’s spring allergy profile is dominated by Birch (March-April) from mature park trees like those in Ruislip Woods; Oak pollen follows (April-May) across borough green spaces. Summer features ubiquitous Grass pollen (May-July), originating from extensive local meadows, sports fields, and the River Colne/Grand Union Canal banks.

The borough’s urban-fringe geography and sheltered residential areas can locally elevate pollen concentrations; dry, windy conditions enhance airborne dispersal. Autumn-winter sees Mould spore prevalence, linked to damp leaf litter and decomposing vegetation in wooded areas.

HIGH

9 active species

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4-Day Forecast:

Morning

Grass LOW

Tree V.HI

Weed LOW

Afternoon

Grass LOW

Tree HIGH

Weed LOW

Evening

Grass LOW

Tree MED

Weed LOW

Species	Level	Count
🌳 English Oak	HIGH	73 grains/m³
🌳 Holm Oak	MED	49 grains/m³
🌳 London Plane	MED	43 grains/m³
🌳 White Oak	MED	43 grains/m³
🌳 Paper Birch	MED	42 grains/m³
+35 more tracked Downy Birch Silver Birch Ribwort Plantain Perennial Ryegrass Box Elder Alder Pigweed Common Ragweed Western Ragweed Giant Ragweed Sagebrush Mugwort Australian Pine Japanese Cypress Fat Hen Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Cock's-foot Ash Mountain Cedar White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed Timothy Grass Grass (mixed) Black Poplar Mesquite Common Sorrel Russian Thistle Field Elm Stinging Nettle All species in the app: Android iOS
🌳 English Oak	HIGH	86 grains/m³
🌳 Holm Oak	HIGH	57 grains/m³
🌳 Paper Birch	HIGH	50 grains/m³
🌳 London Plane	HIGH	50 grains/m³
🌳 White Oak	HIGH	50 grains/m³
+35 more tracked Downy Birch Silver Birch Perennial Ryegrass Ribwort Plantain Common Sorrel Box Elder Alder Pigweed Common Ragweed Western Ragweed Giant Ragweed Sagebrush Mugwort Australian Pine Japanese Cypress Fat Hen Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Cock's-foot Ash Mountain Cedar White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed Timothy Grass Grass (mixed) Black Poplar Mesquite Russian Thistle Field Elm Stinging Nettle All species in the app: Android iOS
🌳 English Oak	HIGH	86 grains/m³
🌳 Holm Oak	HIGH	57 grains/m³
🌳 Paper Birch	HIGH	50 grains/m³
🌳 London Plane	HIGH	50 grains/m³
🌳 White Oak	HIGH	50 grains/m³
+35 more tracked Downy Birch Silver Birch Ribwort Plantain Perennial Ryegrass Common Sorrel Box Elder Alder Pigweed Common Ragweed Western Ragweed Giant Ragweed Sagebrush Mugwort Australian Pine Japanese Cypress Fat Hen Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Cock's-foot Ash Mountain Cedar White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed Timothy Grass Grass (mixed) Black Poplar Mesquite Russian Thistle Field Elm Stinging Nettle All species in the app: Android iOS
🌳 English Oak	MED	44 grains/m³
🌳 Holm Oak	MED	29 grains/m³
🌳 London Plane	MED	26 grains/m³
🌳 White Oak	MED	26 grains/m³
🌳 Paper Birch	MED	25 grains/m³
+35 more tracked Downy Birch Silver Birch Ribwort Plantain Perennial Ryegrass Common Sorrel Box Elder Alder Pigweed Common Ragweed Western Ragweed Giant Ragweed Sagebrush Mugwort Australian Pine Japanese Cypress Fat Hen Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Cock's-foot Ash Mountain Cedar White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed Timothy Grass Grass (mixed) Black Poplar Mesquite Russian Thistle Field Elm Stinging Nettle All species in the app: Android iOS

Last updated: 14:02 UTC

4-Day Forecast	Tree	Grass	Weed
Wed 20 May	HIGH	LOW	LOW
Thu 21 May	HIGH	LOW	LOW
Fri 22 May	HIGH	LOW	LOW
Sat 23 May	MED	LOW	LOW

Map of Hillingdon (51.58305°, -0.501246°)

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What Pollen Levels Mean

LOW Symptoms are unlikely

MED Moderate risk of symptoms

HIGH Widespread symptoms likely

V.HI Expect significant symptoms

X.HI Extremely high symptom likelihood & severity