Pollen Count in Leiria
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Leiria, Portugal has different pollen seasons. Tree pollen is in the air from March to May. Oak, olive, and cypress trees produce a lot of pollen.
Updated: 5/27/2026
Grass pollen is in the air from May to July. This is the worst time for people with pollen problems. Grasses release pollen when it's warm and sunny.
Weed pollen is in the air from August to October. Some plants, like ragweed, produce a lot of pollen. This pollen can travel far and cause problems.
Winter months are usually calm. Some trees, like the plane tree, produce pollen from February to April. But overall, pollen levels are lower during this time.
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 Leiria 🌾. 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 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Feb | 1.2 | 0 | 0.5 | 0 | 0 | 0 |
| Mar | 2.1 | 28.2 | 10.6 | 0 | 0 | 0 |
| Apr | 0.3 | 6.2 | 81.3 | 0 | 615 | 0 |
| May | 0 | 1.5 | 271.2 | 0 | 975.5 | 0 |
| Jun | 0 | 0 | 167.2 | 0 | 16.8 | 0 |
| Jul | 0 | 0 | 85 | 0 | 0.4 | 0 |
| Aug | 0 | 0 | 21.8 | 0.5 | 0 | 0 |
| Sep | 0 | 0 | 3.3 | 0.1 | 0 | 0 |
| Oct | 0 | 0 | 1.3 | 0 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |
(45 km)