Air quality · California
San Francisco Air Quality (AQI) Now
37
Fair
European Air Quality Index
European Air Quality Index
- PM2.5
- 13.5µg/m³WHO limit 15
- PM10
- 14.7µg/m³WHO limit 45
- NO₂
- 19.8µg/m³
- O₃
- 20µg/m³
- Desert dust
- 0µg/m³
- UV index
- 0.0
- US AQI
- 67
Updated: · Source: Copernicus CAMS · Open-Meteo
Air quality in San Francisco is fair right now: European Air Quality Index 37. Fine particulate matter (PM2.5) is 13.5 µg/m³, below the WHO guideline. Fine for outdoor activities; very sensitive people may reduce prolonged strenuous exercise. Pollution is expected to peak around 09:00 over the next 48 hours (index 42, moderate).
San Francisco 48-hour air quality forecast
Air quality near San Francisco
Cleanest to most polluted.
Frequently asked questions
- Is San Francisco polluted today?
- Air quality in San Francisco is fair right now: European Air Quality Index 37. Fine for outdoor activities; very sensitive people may reduce prolonged strenuous exercise.
- Is it safe to exercise outdoors in San Francisco today?
- Yes, air quality is fair right now; fine for outdoor exercise.
- How is the air quality index calculated?
- The European Air Quality Index is set by the worst of PM2.5, PM10, nitrogen dioxide, ozone and sulphur dioxide: 0–20 good, 20–40 fair, 40–60 moderate, 60–80 poor, 80–100 very poor, above 100 extremely poor.
Values are Copernicus Atmosphere Monitoring Service (CAMS) model forecasts and may differ from local monitoring stations.
San Francisco air quality: details
Pollutants and recent days
Nitrogen dioxide (NO₂) is 19.8 µg/m³ and ozone (O₃) 20 µg/m³; WHO guideline values are 25 (24 h) and 100 µg/m³ (8 h).