Grass pollen
The most widespread pollen allergy in Europe, and the one that affects the most people — grasses grow everywhere from Portugal to Finland, so nowhere on the continent has a grass-free season. Counts are lower than birch's but the season is far longer, running most of the summer.
When it is in the air
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Where it dominates
Everywhere. There is no part of the domain without a grass season, though the timing shifts by about a month between south and north.
What the levels mean
| None | < 3 |
| Low | 3 – 19 |
| Moderate | 20 – 49 |
| High | 50 – 199 |
| Very high | ≥ 200 |
Concentrations in grains per cubic metre of air. These bands have been checked against measured counts.