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About Pollen in Windsor

Windsor’s spring allergy profile peaks March-May with high tree pollen; Birch, Oak, and Hornbeam dominate from Windsor Great Park and Home Park’s mature woodlands. Summer transitions to significant grass pollen (May-July), originating from the extensive riverside meadows and Thames embankments.

The Thames Valley’s sheltered topography and enclosed green spaces, like Alexandra Gardens, can concentrate pollen, intensifying local airborne allergen exposure. Autumn (September-November) brings elevated mould spore counts, driven by decomposing leaf litter within forested areas and persistent riverside humidity.

HIGH

11 active species

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4-Day Forecast:

Morning

Grass LOW

Tree X.HI

Weed LOW

Afternoon

Grass LOW

Tree HIGH

Weed LOW

Evening

Grass LOW

Tree MED

Weed LOW

Species	Level	Count
🌳 Silver Birch	HIGH	96 grains/m³
🌳 Downy Birch	HIGH	90 grains/m³
🌳 Paper Birch	HIGH	71 grains/m³
🌳 English Oak	HIGH	59 grains/m³
🌳 White Oak	MED	32 grains/m³
+35 more tracked Holm Oak Box Elder Black Poplar London Plane Ash Field Elm 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 Mountain Cedar Perennial Ryegrass White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed Timothy Grass Ribwort Plantain Grass (mixed) Mesquite Common Sorrel Russian Thistle Stinging Nettle All species in the app: Android iOS
🌳 Silver Birch	V.HI	126 grains/m³
🌳 Downy Birch	V.HI	119 grains/m³
🌳 Paper Birch	HIGH	94 grains/m³
🌳 English Oak	HIGH	77 grains/m³
🌳 White Oak	MED	42 grains/m³
+35 more tracked Holm Oak Box Elder Black Poplar London Plane Ash Field Elm 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 Mountain Cedar Perennial Ryegrass White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed Timothy Grass Ribwort Plantain Grass (mixed) Mesquite Common Sorrel Russian Thistle Stinging Nettle All species in the app: Android iOS
🌳 Silver Birch	V.HI	126 grains/m³
🌳 Downy Birch	V.HI	119 grains/m³
🌳 Paper Birch	HIGH	94 grains/m³
🌳 English Oak	HIGH	77 grains/m³
🌳 White Oak	MED	42 grains/m³
+35 more tracked Holm Oak Box Elder Black Poplar London Plane Ash Field Elm 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 Mountain Cedar Perennial Ryegrass White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed Timothy Grass Ribwort Plantain Grass (mixed) Mesquite Common Sorrel Russian Thistle Stinging Nettle All species in the app: Android iOS
🌳 Silver Birch	HIGH	79 grains/m³
🌳 Downy Birch	HIGH	74 grains/m³
🌳 Paper Birch	HIGH	59 grains/m³
🌳 English Oak	MED	48 grains/m³
🌳 White Oak	MED	26 grains/m³
+35 more tracked Holm Oak Box Elder Black Poplar London Plane Ash Field Elm 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 Mountain Cedar Perennial Ryegrass White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed Timothy Grass Ribwort Plantain Grass (mixed) Mesquite Common Sorrel Russian Thistle Stinging Nettle All species in the app: Android iOS

Last updated: 14:03 UTC

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

Map of Windsor (51.47729°, -0.63118°)

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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