Name: Pollen forecast for Hounslow (2026-09-01)
Creator: Pollen Count
Published: 2026-09-01T15:30:33Z
License: https://pollencount.org/terms/

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About Pollen in Hounslow

Hounslow’s primary spring allergens, Birch and Oak pollen, peak from March to May, originating significantly from mature trees within Lampton Park, Boston Manor Park, and Gunnersbury Park; summer sees high grass pollen counts from late May through July, with abundant sources along River Crane meadows and managed municipal parklands. The urban-green interface, notably around Gunnersbury Park, creates sheltered conditions that can locally concentrate airborne pollen, intensifying exposure. Autumn brings elevated mould spore levels from October to November, driven by damp leaf decomposition in wooded areas and along the Grand Union Canal banks.

The pollen count in Hounslow today is HIGH, driven mainly by Giant Ragweed.

HIGH

15 active species

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4-Day Forecast:

Morning

Grass MED

Tree LOW

Weed MED

Afternoon

Grass MED

Tree LOW

Weed HIGH

Evening

Grass LOW

Tree LOW

Weed MED

Species	Level	Count
🌿 Giant Ragweed	HIGH	20 grains/m³
🌿 Common Ragweed	HIGH	16 grains/m³
🌿 Mugwort	MED	11 grains/m³
🌾 Perennial Ryegrass	MED	9 grains/m³
🌾 Grass (mixed)	MED	9 grains/m³
+35 more tracked Cock's-foot Timothy Grass Sagebrush Stinging Nettle Pigweed Fat Hen Russian Thistle Western Ragweed Ribwort Plantain Common Sorrel Box Elder Alder Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Ash Mountain Cedar White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed London Plane Black Poplar Mesquite White Oak Holm Oak English Oak Field Elm All species in the app: Android iOS
🌿 Giant Ragweed	HIGH	24 grains/m³
🌿 Common Ragweed	HIGH	20 grains/m³
🌿 Mugwort	MED	14 grains/m³
🌾 Grass (mixed)	MED	11 grains/m³
🌾 Cock's-foot	MED	10 grains/m³
+35 more tracked Perennial Ryegrass Timothy Grass Sagebrush Russian Thistle Stinging Nettle Pigweed Western Ragweed Fat Hen Ribwort Plantain Common Sorrel Box Elder Alder Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Ash Mountain Cedar White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed London Plane Black Poplar Mesquite White Oak Holm Oak English Oak Field Elm All species in the app: Android iOS
🌿 Giant Ragweed	HIGH	26 grains/m³
🌿 Common Ragweed	HIGH	22 grains/m³
🌿 Mugwort	HIGH	15 grains/m³
🌿 Sagebrush	MED	10 grains/m³
🌿 Stinging Nettle	MED	8 grains/m³
+35 more tracked Fat Hen Perennial Ryegrass Grass (mixed) Russian Thistle Pigweed Western Ragweed Cock's-foot Timothy Grass Ribwort Plantain Common Sorrel Box Elder Alder Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Ash Mountain Cedar White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed London Plane Black Poplar Mesquite White Oak Holm Oak English Oak Field Elm All species in the app: Android iOS
🌿 Giant Ragweed	HIGH	17 grains/m³
🌿 Common Ragweed	MED	14 grains/m³
🌿 Mugwort	MED	10 grains/m³
🌿 Sagebrush	MED	6 grains/m³
🌿 Russian Thistle	MED	5 grains/m³
+35 more tracked Stinging Nettle Pigweed Western Ragweed Fat Hen Ribwort Plantain Cock's-foot Perennial Ryegrass Timothy Grass Grass (mixed) Common Sorrel Box Elder Alder Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Ash Mountain Cedar White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed London Plane Black Poplar Mesquite White Oak Holm Oak English Oak Field Elm All species in the app: Android iOS

Last updated: 15:30 UTC

4-Day Forecast	Tree	Grass	Weed
Tue 1 Sep	LOW	MED	HIGH
Wed 2 Sep	LOW	MED	HIGH
Thu 3 Sep	LOW	MED	HIGH
Fri 4 Sep	LOW	LOW	HIGH

Map of Hounslow (51.494591°, -0.300581°)

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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