The inland setting means local environmental conditions are shaped more by urban density than coastal influences.
In line with average conditions across San Francisco
24-Hour AQI Trend
Pollutant Breakdown
Peer Comparison
In line with average conditions across San Francisco
Why San Francisco's Air Is What It Is
San Francisco sits in an inland urban setting where local environmental conditions are shaped primarily by density and development patterns. Temperature swings between day and night can be more pronounced than in coastal areas.
Historical Context
Current AQI of 28 reflects recent monitoring data. Local conditions can shift with weather patterns, traffic volume, and seasonal factors.
24-Hour Hourly Forecast
Best window: 06:00 (AQI 27) · Peak AQI: 50 at 22:00
| Time | AQI | Temp (°F) | Humidity | Wind (mph) | PM2.5 | PM10 |
|---|---|---|---|---|---|---|
| 00:00 | 33 | 133.2 | 68% | 3.7 | 8.6 | 13.0 |
| 01:00 | 32 | 131.9 | 72% | 3.9 | 8.1 | 12.0 |
| 02:00 | 31 | 131.9 | 64% | 3.6 | 7.6 | 11.3 |
| 03:00 | 29 | 131.2 | 73% | 2.4 | 7.4 | 10.9 |
| 04:00 | 28 | 130.6 | 76% | 2.2 | 7.3 | 10.7 |
| 05:00 | 28 | 129.9 | 77% | 1.8 | 6.8 | 9.8 |
| 06:00 | 27 | 130.1 | 76% | 2.0 | 6.3 | 9.0 |
| 07:00 | 27 | 129.6 | 84% | 3.4 | 5.8 | 8.1 |
| 08:00 | 27 | 129.4 | 81% | 0.9 | 5.6 | 8.1 |
| 09:00 | 27 | 129.2 | 82% | 1.8 | 5.7 | 8.2 |
| 10:00 | 28 | 129.9 | 80% | 1.1 | 5.8 | 8.3 |
| 11:00 | 28 | 130.6 | 77% | 2.1 | 5.8 | 8.3 |
| 12:00 | 28 | 132.6 | 70% | 6.5 | 5.7 | 8.1 |
| 13:00 | 29 | 134.2 | 65% | 7.4 | 5.5 | 7.9 |
| 14:00 | 32 | 135.1 | 63% | 9.2 | 5.2 | 7.3 |
| 15:00 | 34 | 135.7 | 61% | 9.6 | 4.4 | 6.2 |
| 16:00 | 37 | 136.2 | 59% | 8.2 | 3.3 | 4.6 |
| 17:00 | 40 | 138.9 | 42% | 8.3 | 2.5 | 3.2 |
| 18:00 | 43 | 138.2 | 48% | 10.4 | 2.4 | 3.0 |
| 19:00 | 46 | 140.5 | 39% | 9.8 | 2.6 | 3.1 |
| 20:00 | 48 | 139.5 | 40% | 10.0 | 2.7 | 3.3 |
| 21:00 | 49 | 138.4 | 40% | 10.6 | 2.8 | 3.3 |
| 22:00 | 50 | 136.8 | 42% | 10.4 | 2.9 | 3.4 |
| 23:00 | 50 | 135.5 | 44% | 11.7 | 3.0 | 3.6 |
Air quality is forecast to be good for most of the day. Great time for outdoor activities!
San Francisco's air quality follows a daily rhythm that can help you plan outdoor activities. The forecast indicates 06:00 (AQI 27) as the optimal window, with AQI reaching its lowest at 27 around 06:00. Conditions are less favorable during 22:00 (AQI 50) when readings hit 50 at 22:00. For those with respiratory considerations in San Francisco, the forecast offers valuable advance notice. Air quality is forecast to be good for most of the day. Great time for outdoor activities! Consulting with a healthcare provider about personal sensitivity to the forecasted conditions may be helpful.