Pollen Count in Letchworth Garden City
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Tree pollen starts in March. It's a big problem in Letchworth Garden City. Trees like oak, ash, and hazel make a lot of pollen. It floats in the air.
Updated: 5/31/2026
Grass pollen starts in May. It's the worst pollen for people. Grasses in parks and fields make lots of pollen. It blows in the wind.
Weed pollen happens in summer. Some weeds make a lot of pollen. They grow in gardens and fields. Their pollen floats around.
Pollen counts go down in autumn. Trees and grasses stop making pollen. Weeds still make some pollen. But it's not as bad as spring and summer.
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 Letchworth Garden City 🌾. 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 | 3.8 | 0 | 0 | 0 | 0 | 0 |
| Mar | 107.3 | 28.1 | 0 | 0 | 0 | 0 |
| Apr | 95 | 1063.1 | 4.3 | 0 | 0 | 0 |
| May | 0.3 | 89.9 | 106.3 | 0 | 0.2 | 0 |
| Jun | 0 | 0 | 1279 | 22.1 | 0.1 | 0 |
| Jul | 0 | 0.1 | 633 | 178.3 | 0 | 0 |
| Aug | 0 | 0 | 88.9 | 38.1 | 0 | 0 |
| Sep | 0 | 0 | 3.9 | 0.4 | 0 | 0.5 |
| Oct | 0 | 0 | 0 | 0 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |
(26 km)