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About Pollen in Croydon

Croydon’s primary spring allergens are Birch (March-May) and Oak (April-June) pollen, sourced from abundant mature trees in Lloyd Park, Park Hill Park, and numerous urban street plantings. Summer brings ubiquitous Grass pollen (June-August), prevalent across open green spaces like Farthing Downs and along the River Wandle Trail’s banks.

The borough’s varied topography and urban heat island effect can concentrate pollen, intensifying exposure. Late-season Mould spores (September-November) proliferate from decaying organic matter in shaded, damp zones of local woodlands and leaf litter in residential areas, peaking post-rainfall.

V.HI

11 active species

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4-Day Forecast:

Morning

Grass LOW

Tree X.HI

Weed LOW

Afternoon

Grass LOW

Tree V.HI

Weed LOW

Evening

Grass LOW

Tree MED

Weed LOW

Species	Level	Count
🌳 Silver Birch	V.HI	116 grains/m³
🌳 Downy Birch	HIGH	86 grains/m³
🌳 Paper Birch	HIGH	68 grains/m³
🌳 English Oak	HIGH	56 grains/m³
🌳 White Oak	MED	31 grains/m³
+35 more tracked Ash Black Poplar Box Elder Holm Oak London Plane 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	171 grains/m³
🌳 Downy Birch	V.HI	128 grains/m³
🌳 Paper Birch	V.HI	100 grains/m³
🌳 English Oak	HIGH	83 grains/m³
🌳 White Oak	MED	46 grains/m³
+35 more tracked Ash Black Poplar Box Elder Holm Oak London Plane 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	160 grains/m³
🌳 Downy Birch	V.HI	119 grains/m³
🌳 Paper Birch	HIGH	93 grains/m³
🌳 English Oak	HIGH	77 grains/m³
🌳 White Oak	MED	43 grains/m³
+35 more tracked Ash Black Poplar Box Elder Holm Oak London Plane 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	105 grains/m³
🌳 Downy Birch	HIGH	78 grains/m³
🌳 Paper Birch	HIGH	61 grains/m³
🌳 English Oak	HIGH	50 grains/m³
🌳 White Oak	MED	28 grains/m³
+35 more tracked Ash Black Poplar Box Elder Holm Oak London Plane 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: 14:02 UTC

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

Map of Croydon (51.329567°, 0.002855°)

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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