Air quality now
Air quality in Chicago
United States
Above WHO limits — O₃ is 1.2× the WHO limit
- PM2.515 µg/m³1.0×
- PM1016 µg/m³0.4×
- NO₂4 µg/m³0.2×
- O₃122 µg/m³1.2×
- SO₂2 µg/m³0.0×
- CO165 µg/m³0.0×
What you're seeing
Each ball is a pollutant measured in Chicagoright now. The more balls of a colour, the more of that pollutant is in the air — normalised against the World Health Organization's safe limits, so a hazy city looks unmistakably denser than a clean one. Data is live from Open-Meteo / CAMS. How Polly works →
Want your own city and a hay-fever pollen view? Open the live map, or track your symptoms against the air.