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Air Quality in San Francisco, United States
Updated 2026-05-21T06:00:00-07:00 · Station: San Francisco-Arkansas Street, San Francisco, California
53
Moderate · Dominant pollutant: PM2.5
Acceptable for most, but unusually sensitive people may experience minor symptoms.
The current Air Quality Index (AQI) in San Francisco is 53, categorized as Moderate. Acceptable for most, but unusually sensitive people may experience minor symptoms.
Pollutants & conditions
| Measurement | Value |
|---|
| PM2.5 | 53 |
| Ozone (O₃) | 16 |
| Nitrogen Dioxide (NO₂) | 4.6 |
| Carbon Monoxide (CO) | 2.3 |
| Temperature (°C) | 13 |
| Humidity (%) | 85.5 |
| Pressure (hPa) | 1011.6 |
| Wind (m/s) | 0.1 |
| Wind Gust (m/s) | 1.5 |
PM2.5 forecast
| Date | Avg | Min | Max |
|---|
| 2026-05-19 | 15 | 15 | 15 |
| 2026-05-20 | 18 | 16 | 46 |
| 2026-05-21 | 23 | 19 | 38 |
| 2026-05-22 | 35 | 29 | 40 |
| 2026-05-23 | 33 | 30 | 36 |
Nearby cities
More cities in United States · All cities