Pollen Count in Chatou
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In late winter and early spring, trees start to release pollen in Chatou. Hazel and alder are often first. Then birch follows. These tiny grains can travel in the air on windy days. This season usually begins in February and grows stronger in March and April.
Updated: 7/31/2026
In spring, many more trees add pollen to the air. Oak, plane tree, and pine can all release pollen. Grass pollen also starts later in spring. Parks, gardens, and streets with many trees can have more pollen during this time. April, May, and June are often busy months.
In early summer, grass pollen is very common in Chatou. Meadows, lawns, and field edges release it when grass flowers. Ryegrass and other wild grasses are important too. Warm and dry weather can make pollen spread more. This season often peaks in May and June.
In late summer and autumn, weed pollen becomes more important. Plants like mugwort can release pollen during this time. It is often seen from July to September. The air may carry less tree and grass pollen then, but some plants still bloom and send out grains.
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 Chatou 🌾. 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 | 90.6 | 0 | 0 | 0 | 0 | 0 |
| Mar | 735.5 | 209.9 | 0 | 0 | 0 | 0 |
| Apr | 3.7 | 1426.8 | 20.8 | 0 | 0 | 0 |
| May | 0.6 | 33.8 | 216.8 | 0 | 3.6 | 0 |
| Jun | 0 | 0 | 891.5 | 22.2 | 1 | 0 |
| Jul | 0 | 0 | 313.1 | 201.8 | 0 | 0 |
| Aug | 0 | 0 | 75.1 | 78.7 | 0 | 3.1 |
| Sep | 0 | 0 | 6 | 55.7 | 0 | 4 |
| Oct | 0 | 0 | 0.5 | 9.4 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |
(5 km)