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About Pollen in Bolton

Bolton’s spring allergy profile, March-May, is dominated by early-flowering Birch and Alder from Queens Park and residential street trees; followed by Oak and Sycamore pollen, particularly from Leverhulme Park and Rivington Pike woodlands, extending into June. Peak summer sees widespread Grass pollen (June-July) originating from Moses Gate Country Park meadows and surrounding agricultural lands.

The urban valley topography, often humid, can trap and concentrate pollen locally. Late autumn brings heightened mould spore exposure (September-November) from damp leaf litter decomposition in parks and shaded residential areas, exacerbated by Bolton’s high rainfall.

MED

9 active species

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4-Day Forecast:

Morning

Grass LOW

Tree HIGH

Weed LOW

Afternoon

Grass LOW

Tree MED

Weed LOW

Evening

Grass LOW

Tree MED

Weed LOW

Species	Level	Count
🌳 Ash	MED	46 grains/m³
🌳 Silver Birch	MED	35 grains/m³
🌳 Alder	MED	26 grains/m³
🌳 Box Elder	MED	22 grains/m³
🌳 Black Poplar	MED	22 grains/m³
+35 more tracked Field Elm Downy Birch Paper Birch English Oak 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 London Plane Grass (mixed) Mesquite White Oak Holm Oak Common Sorrel Russian Thistle Stinging Nettle All species in the app: Android iOS
🌳 Ash	HIGH	61 grains/m³
🌳 Silver Birch	MED	47 grains/m³
🌳 Alder	MED	35 grains/m³
🌳 Box Elder	MED	30 grains/m³
🌳 Field Elm	MED	30 grains/m³
+35 more tracked Black Poplar Downy Birch Paper Birch English Oak 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 London Plane Grass (mixed) Mesquite White Oak Holm Oak Common Sorrel Russian Thistle Stinging Nettle All species in the app: Android iOS
🌳 Ash	HIGH	97 grains/m³
🌳 Silver Birch	HIGH	74 grains/m³
🌳 Alder	HIGH	56 grains/m³
🌳 Box Elder	MED	47 grains/m³
🌳 Field Elm	MED	47 grains/m³
+35 more tracked Black Poplar Downy Birch Paper Birch English Oak White Oak 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 London Plane Grass (mixed) Mesquite Holm Oak Common Sorrel Russian Thistle Stinging Nettle All species in the app: Android iOS
🌳 Ash	HIGH	61 grains/m³
🌳 Silver Birch	MED	47 grains/m³
🌳 Alder	MED	35 grains/m³
🌳 Box Elder	MED	30 grains/m³
🌳 Field Elm	MED	30 grains/m³
+35 more tracked Black Poplar Downy Birch Paper Birch English Oak 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 London Plane Grass (mixed) Mesquite White Oak Holm Oak 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	MED	LOW	LOW
Thu 21 May	HIGH	LOW	LOW
Fri 22 May	HIGH	LOW	LOW
Sat 23 May	HIGH	LOW	LOW

Map of Bolton (53.635147°, -2.449409°)

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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