Air quality · United States
California Air Quality (AQI) Now
46
Moderate
European Air Quality Index
European Air Quality Index
- PM2.5
- 4.8µg/m³WHO limit 15
- PM10
- 12.2µg/m³WHO limit 45
- NO₂
- 0.8µg/m³
- O₃
- 106µg/m³
- Desert dust
- 13µg/m³
- UV index
- 1.6
- US AQI
- 37
Updated: · Source: Copernicus CAMS · Open-Meteo
Air quality in California is moderate right now: European Air Quality Index 46. Fine particulate matter (PM2.5) is 4.8 µg/m³, below the WHO guideline. People with asthma, heart or lung conditions should reduce strenuous outdoor activity. Pollution is expected to peak around 16:00 over the next 48 hours (index 46, moderate).
California 48-hour air quality forecast
Air quality across California
Cleanest to most polluted.
Frequently asked questions
- Is California polluted today?
- Air quality in California is moderate right now: European Air Quality Index 46. People with asthma, heart or lung conditions should reduce strenuous outdoor activity.
- Is it safe to exercise outdoors in California today?
- For most people yes; with air quality moderate, people with asthma or heart and lung conditions should ease off intense 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.
California air quality: details
Pollutants and recent days
Nitrogen dioxide (NO₂) is 0.8 µg/m³ and ozone (O₃) 106 µg/m³; WHO guideline values are 25 (24 h) and 100 µg/m³ (8 h).