polen·tracker

The app

Polen-tracker: your city's pollen map, tree by tree

Polen-tracker is a free web app that maps allergenic pollen across Barcelona and Madrid at street level. It combines open urban-tree inventories with each species' flowering cycle to show where and when pollen is present, plus a daily index tailored to your allergies. No registration, no account and no cookies.

Open Polen-trackerView the pollen map

A street-level pollen map

Standard pollen reports provide one reading for an entire city. Tree pollen is local, however, and the mix of species changes from one neighbourhood to the next. Polen-tracker starts with real trees —around 222,800 in Barcelona and nearly 793,000 in Madrid— to draw a much more detailed heat map, street by street.

How it works

It combines three open sources: each council’s tree inventory, the pollen calendar from the UAB Aerobiological Information Point and weather data from Open-Meteo. The app uses them on your device to calculate a daily index and a map filtered by your allergies.

What’s included

  • Pollen heat map for tree species currently in flower.
  • Your daily index based on allergens and current weather.
  • A species-by-species pollen calendar.
  • Neighbourhood levels and urban-tree density hotspots.
  • Near me: a count of each tree type within 50 metres.

Available cities

Free, anonymous and cookie-free

There are no accounts or tracking. Preferences remain on your device, no tracking cookies are used and the web app can be installed on your phone.

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.

View the pollen mapPollen calendar

Medical notice. Polen-tracker is an information tool, not a medical device or diagnostic product. Its index is an estimate based on urban trees, phenology and weather —not a direct measurement of airborne pollen— and may not match your symptoms. Consult an allergy specialist before changing any treatment.

Sources: open tree inventories from Barcelona City Council and Madrid City Council (CC BY 4.0); pollen calendar from the UAB Aerobiological Information Point; weather from Open-Meteo.