Data Disclaimer
Last updated: March 2026
Data Sources
Verified annual average measurements (E1a dataset) from the European Environment Agency (EEA) Download API. Hourly station data aggregated to annual means for 2020-2024.
Measurement Methodology
All measurements come from EEA-verified monitoring stations classified as E1a (verified data). Station-level hourly measurements are aggregated into annual averages. Cities may have multiple monitoring stations; we use the station-level data to calculate city-level averages.
Pollutants Covered
The tracker covers PM2.5 (fine particulate matter), PM10 (coarse particulate matter), NO₂ (nitrogen dioxide), O₃ (ozone), and SO₂ (sulphur dioxide). Not all pollutants are measured at every station or in every city.
Limitations
Annual averages may not reflect current air quality conditions. Air pollution varies significantly by season, weather, and location within a city. Station placement (traffic, background, industrial) affects readings. The 2030 compliance assessments are based on proposed EU targets and may change as legislation evolves.
Not a Substitute for Official Data
This site is not a substitute for official government air quality monitoring. For real-time air quality information and health advisories, consult your national or local environmental agency.