Air quality now
Air quality in San Francisco
United States
Above WHO limits — PM2.5 is 1.1× the WHO limit
🚬 Breathing this all day ≈ smoking 0.8 cigarettes
Each ball below is a pollutant measured in San Francisco, sized against WHO safe limits — it's a snapshot of the air, not a map.
- PM2.517 µg/m³1.1×
- PM1018 µg/m³0.4×
- NO₂27 µg/m³1.1×
- O₃45 µg/m³0.5×
- SO₂2 µg/m³0.1×
- CO195 µg/m³0.0×
What you're seeing
Each ball is a pollutant measured in San Franciscoright 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.