San Francisco air quality · California, United States
Air this clean can boost your mood and focus
US AQI 37 (Good) in San Francisco, from 1 AirNow monitoring station. Main pollutant: PM2.5.
Updated
Pollutants in San Francisco
- Ozone31AQI
- PM2.537AQI
- NO₂8AQI
US values are per-pollutant AQI from the highest-reading monitor near San Francisco (Oakland West).
Is it safe outside in San Francisco right now?
Air quality is satisfactory and poses little or no risk.
Walking and commuting
Go aheadEnjoy it.
Running and jogging
Go aheadA great time to run outdoors.
Cycling
Go aheadRide freely.
Children playing outside
Go aheadNo limits.
Older adults and heart or lung conditions
Go aheadNo limits.
Open windows
Go aheadAir out your home.
Mask outdoors
Not neededNot needed.
Air purifier indoors
Not neededNot needed.
Based on the US EPA Air Quality Guide, applied to the current US AQI category. If you have symptoms, follow your doctor's advice.
What US AQI 0–50 means for your health →
San Francisco air quality history
Daily average, 36 days- 47average daily US AQI over 36 days
- 68worst day, 11 October
- 21cleanest day, 22 September
- 0days at Unhealthy or worse
The last 7 days averaged 53, about the same as the week before (52). 22 of the last 36 days were Good.
Weather in San Francisco
No active National Weather Service alerts for San Francisco.
| Day | Forecast | High | Low | Rain |
|---|---|---|---|---|
| Mon 19 | Mostly Sunny | 63°F | 54°F | 7% |
| Tue 20 | Mostly Cloudy | 64°F | 55°F | 67% |
| Wed 21 | Rain Showers Likely | 64°F | 55°F | 67% |
| Thu 22 | Slight Chance Rain Showers then Partly Sunny | 64°F | 54°F | 23% |
| Fri 23 | Sunny | 64°F | 54°F | 2% |
| Sat 24 | Sunny then Slight Chance Light Rain | 66°F | 55°F | 22% |
| Sun 25 | Slight Chance Light Rain | 66°F | 54°F | 22% |
National Weather Service forecast. All US weather alerts →
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San Francisco air quality: common questions
What is the AQI in San Francisco right now?
The US AQI in San Francisco is 37 (Good). The main pollutant is PM2.5.
Is it safe to go outside in San Francisco today?
A great time to be outside. Air quality is satisfactory and poses little or no risk. For runners: A great time to run outdoors.
How has air quality in San Francisco been recently?
Over the last 36 days with data, San Francisco averaged US AQI 47. The worst day was 11 October at 68; the cleanest was 22 September at 21. 0 days were at Unhealthy or worse.
Where does San Francisco's air quality data come from?
From US EPA AirNow, using 1 monitoring station in and around the city. Good Air does not estimate or adjust these readings.
Source: US EPA AirNow. Readings are published by the monitoring agency and may be revised.