Paris
Pollen in Paris: street-level map, calendar and trees
Paris publishes its trees as open data: about 218,000 georeferenced specimens with their species — nearly one in five a plane tree. Polen-tracker crosses that catalogue with each species' phenology to draw a street-level pollen map.
A street-level pollen map
Regional bulletins give a single level for the whole Île-de-France. But tree pollen is local: every dot on the map is a catalogued tree, and the heat map summarises the density of blooming species you react to.
Which trees pollinate in Paris, and when
Main taxa of Parisian street trees, with their pollination window and relative allergenicity:
| Tree | Pollen months | Allergenicity |
|---|---|---|
| Plane tree | March–April | Very high |
| Birches & alders | March–April | High |
| Cypresses & yews | December–March | High |
| Lime trees | June–July | Low |
| Pine & cedar | March–May | Low |
| Grasses (non-tree) | May–July | Very high |
Grasses are a major allergen but not trees: they appear in the calendar, not yet on the map or in the index.
Levels by neighbourhood and weather
Polen-tracker combines the density of blooming trees with current weather: wind and dry air raise the level; rain washes it out. On Home you'll see the neighbourhood ranking (from Le Marais to Passy) and your personal index for today.
Tips for high-pollen days
- Air the house early or after rain.
- Sunglasses and, during strong peaks, a mask outdoors.
- Don't dry laundry outside and shower when you get home.
- Check the map before planning outdoor sport.
Try it with your city
Polen-tracker is free, requires no account and works on mobile. Open the map or calendar and filter by the trees that affect you.