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About Pollen in Lancaster

Birch pollen peaks March-April, highly concentrated in Williamson Park and Lancaster University grounds; Oak pollen follows into May, prominent across urban woodland fringes; Grass pollen dominates June-July, sourced from River Lune floodplains, canal towpaths, and adjacent agricultural fields.

Lancaster’s valley topography and Morecambe Bay proximity can concentrate pollen locally; autumnal mould spores increase September-November, driven by damp leaf litter decomposition in parks and shaded urban spaces.

HIGH

10 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
🌳 Ash	HIGH	54 grains/m³
🌳 Silver Birch	MED	47 grains/m³
🌳 Downy Birch	MED	32 grains/m³
🌳 Box Elder	MED	26 grains/m³
🌳 Black Poplar	MED	26 grains/m³
+35 more tracked Paper Birch Field Elm Alder 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	90 grains/m³
🌳 Silver Birch	HIGH	78 grains/m³
🌳 Downy Birch	HIGH	53 grains/m³
🌳 Box Elder	MED	44 grains/m³
🌳 Black Poplar	MED	43 grains/m³
+35 more tracked Paper Birch Field Elm Alder English Oak White Oak Holm 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 Common Sorrel Russian Thistle Stinging Nettle All species in the app: Android iOS
🌳 Ash	V.HI	140 grains/m³
🌳 Silver Birch	V.HI	122 grains/m³
🌳 Downy Birch	HIGH	82 grains/m³
🌳 Box Elder	HIGH	69 grains/m³
🌳 Black Poplar	HIGH	67 grains/m³
+35 more tracked Paper Birch Field Elm English Oak Alder White Oak Holm 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 Common Sorrel Russian Thistle Stinging Nettle All species in the app: Android iOS
🌳 Ash	V.HI	128 grains/m³
🌳 Silver Birch	V.HI	112 grains/m³
🌳 Downy Birch	HIGH	75 grains/m³
🌳 Box Elder	HIGH	63 grains/m³
🌳 Black Poplar	HIGH	61 grains/m³
+35 more tracked Paper Birch Field Elm Alder English Oak White Oak Holm 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 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	HIGH	LOW	LOW
Thu 21 May	HIGH	LOW	LOW
Fri 22 May	V.HI	LOW	LOW
Sat 23 May	V.HI	LOW	LOW

Map of Lancaster (54.043863°, -2.795905°)

More in United Kingdom

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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