Air quality in San Francisco today
Argentina · Updated Thursday 20:00 (local time) · Model data from the Copernicus Atmosphere Monitoring Service
Fair European AQI
Fine for almost everyone.
Pollutants right now
| Pollutant | Value | Level |
|---|---|---|
| PM2.5 | 2 µg/m³ | Good |
| PM10 | 3 µg/m³ | Good |
| NO₂ | 2 µg/m³ | Good |
| O₃ | 71 µg/m³ | Fair |
The pollutant that matters most in San Francisco right now is O₃.
Forecast: next 24 hours
The air in San Francisco should stay good to fair for the next 24 hours. The cleanest hour is expected around Fri 09:00.
| Time | AQI | Level | PM2.5 |
|---|---|---|---|
| Thu 21:00 | 24 | Fair | 3 |
| Fri 00:00 | 25 | Fair | 3 |
| Fri 03:00 | 23 | Fair | 3 |
| Fri 06:00 | 22 | Fair | 4 |
| Fri 09:00 | 20 | Good | 5 |
| Fri 12:00 | 33 | Fair | 5 |
| Fri 15:00 | 38 | Fair | 5 |
| Fri 18:00 | 40 | Fair | 5 |
The last 30 days
Over the last 30 days the average daily AQI in San Francisco was 25, with 0 day(s) rated poor or worse. The cleanest day was 22 Sept, the most polluted 19 Sept.
Questions and answers
- Is the air in San Francisco good today?
- Right now the European Air Quality Index in San Francisco is 26, which is fair. Fine for almost everyone.
- What pollutes the air in San Francisco?
- At the moment O₃ contributes most to the air quality index in San Francisco. The index takes the worst of fine particles (PM2.5), coarser particles (PM10), nitrogen dioxide, ozone and sulphur dioxide.
- When will the air in San Francisco be cleanest?
- The air in San Francisco should stay good to fair for the next 24 hours. The cleanest hour is expected around Fri 09:00.
- Where does this data come from?
- Wheezair shows model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), served by Open-Meteo: about 11 km resolution in Europe and 40 km elsewhere, updated daily. They are not station measurements, so a busy street can be worse than its city's value.