Pollen Count in Hemel Hempstead
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Hemel Hempstead has high pollen counts from March to October. Tree pollen starts in March and April. Many trees release pollen during this time.
Updated: 3/25/2026
Grass pollen is a problem from May to July. Grasses release a lot of pollen into the air. This makes it hard for people outside.
Weed pollen happens from August to October. Ragweed and nettle are common weeds that produce pollen. These weeds grow in many areas.
Pollen counts are usually low in winter. From November to February, there is little to no pollen in the air. This is a break for people.
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 Hemel Hempstead 🌾. 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 | 144.2 | 26.8 | 0 | 0 | 0 | 0 |
| Apr | 307.6 | 1212.4 | 5.6 | 0 | 0 | 0 |
| May | 0.5 | 88.2 | 105.3 | 0 | 0.3 | 0 |
| Jun | 0 | 0 | 1203.6 | 26.8 | 0.1 | 0 |
| Jul | 0 | 0.1 | 686 | 211.5 | 0 | 0 |
| Aug | 0 | 0 | 95.6 | 39 | 0 | 0 |
| Sep | 0 | 0 | 4.6 | 0.4 | 0 | 0.5 |
| Oct | 0 | 0 | 0.1 | 0 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |
(7 km)