Air quality index converter
Convert pollutant concentrations (PM2.5, PM10, ozone, NO₂, SO₂) to the European Air Quality Index and the US AQI, with health advice.
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European AQI bands
How to use it
- Choose a pollutant.
- Enter a concentration.
- Read both index bands and advice.
The European Air Quality Index uses the EEA bands revised in July 2025, the same method as PiSpace Air. It uses hourly concentrations for NO₂, O₃ and SO₂ and 24-hour running means for particles. The US AQI (EPA) uses 24-hour averages for particles (2024 PM2.5 breakpoints), 8-hour ozone and 1-hour NO₂/SO₂; µg/m³ are converted to ppb at 25 °C. Values computed from a single reading are indicative only. WHO 2021 guideline levels are shown for comparison.