Pollen Count in Hounslow
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Hounslow has many trees, grasses, and flowers that produce pollen. Pollen is a fine powder that plants make to help them make seeds.
Updated: 2/28/2026
Tree pollen season starts in March. Many trees in Hounslow, like oak, ash, and hazel, make a lot of pollen. This makes people feel unwell.
Grass pollen season starts in May. It's the worst in June and July. Grasses make a lot of pollen, and it's hard to stay inside.
Weed pollen season is in August and September. Some plants, like ragweed, make pollen. People with pollen problems should stay inside on high-pollen days.
Pollen Forecast Chart
Recommendations
When pollen concentrations reach a peak, we suggest these simple steps to help with hay fever. These tips are extra important on windy days when plants are in peak anthesis (the time when they release the most pollen).
- Wear masks if necessary
- Shower after going out
- Wear sunglasses if windy
- Close windows and doors
- Use an indoor air purifier
- Avoid wearing woolen clothes outside
- Limit outdoor activities
Annual Pollen Overview
Check out this month-by-month overview of the daily average pollen count in Hounslow 🌾. This data is based on previous years and serves as a guideline to help you understand when different pollen seasons typically occur in your city.
| Alder | Birch | Grass | Mugwort | Olive | Ragweed | |
|---|---|---|---|---|---|---|
| Jan | 0 | 0 | 0 | 0 | 0 | 0 |
| Feb | 3 | 0 | 0 | 0 | 0 | 0 |
| Mar | 272.3 | 99.5 | 0 | 0 | 0 | 0 |
| Apr | 244.3 | 941.3 | 4.9 | 0 | 0 | 0 |
| May | 0.7 | 82.9 | 77 | 0 | 0.4 | 0 |
| Jun | 0 | 0 | 806.3 | 53.5 | 0.1 | 0 |
| Jul | 0 | 0.1 | 510 | 485.1 | 0 | 0 |
| Aug | 0 | 0 | 68.9 | 90.6 | 0 | 0 |
| Sep | 0 | 0 | 3.7 | 0.8 | 0 | 0.6 |
| Oct | 0 | 0 | 0.1 | 0 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |
(4 km)