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About Pollen in Cardiff

Cardiff’s seasonal allergy profile commences spring with dominant birch and oak pollen, originating from extensive urban green spaces including Bute Park and Roath Park; summer transitions to peak grass pollen from River Taff floodplains and peripheral meadows.

The city’s sheltered valley topography, combined with prevailing south-westerly winds from the Bristol Channel, can trap and concentrate airborne allergens, particularly within the urban basin. Late autumn and winter elevate mould spore counts, exacerbated by Cardiff’s often damp climate and the decomposition of organic matter in humid, shaded locales.

V.HI

10 active species

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4-Day Forecast:

Morning

Grass LOW

Tree V.HI

Weed LOW

Afternoon

Grass LOW

Tree V.HI

Weed LOW

Evening

Grass LOW

Tree MED

Weed LOW

Species	Level	Count
🌳 Downy Birch	V.HI	134 grains/m³
🌳 Silver Birch	V.HI	122 grains/m³
🌳 Paper Birch	V.HI	106 grains/m³
🌳 English Oak	V.HI	100 grains/m³
🌳 White Oak	HIGH	61 grains/m³
+35 more tracked Holm Oak London Plane Black Poplar Box Elder Ash 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 Field Elm Stinging Nettle All species in the app: Android iOS
🌳 Downy Birch	V.HI	159 grains/m³
🌳 Silver Birch	V.HI	144 grains/m³
🌳 Paper Birch	V.HI	125 grains/m³
🌳 English Oak	V.HI	119 grains/m³
🌳 White Oak	HIGH	72 grains/m³
+35 more tracked Holm Oak London Plane Black Poplar Box Elder Ash 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 Field Elm Stinging Nettle All species in the app: Android iOS
🌳 Downy Birch	X.HI	204 grains/m³
🌳 Silver Birch	V.HI	185 grains/m³
🌳 Paper Birch	V.HI	160 grains/m³
🌳 English Oak	V.HI	152 grains/m³
🌳 White Oak	HIGH	93 grains/m³
+35 more tracked Holm Oak London Plane Black Poplar Box Elder Ash 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 Field Elm Stinging Nettle All species in the app: Android iOS
🌳 Downy Birch	X.HI	294 grains/m³
🌳 Silver Birch	X.HI	267 grains/m³
🌳 Paper Birch	X.HI	231 grains/m³
🌳 English Oak	X.HI	220 grains/m³
🌳 White Oak	V.HI	134 grains/m³
+35 more tracked Holm Oak London Plane Black Poplar Box Elder Ash 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 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	V.HI	LOW	LOW
Thu 21 May	V.HI	LOW	LOW
Fri 22 May	X.HI	LOW	LOW
Sat 23 May	X.HI	LOW	LOW

Map of Cardiff (51.477024°, -3.156657°)

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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