San Francisco Best & Worst AQI Days: Air Quality Guide
Explore the best and worst days for outdoor activities in San Francisco based on air quality.
Current Air Quality
Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Extra Protection for San Francisco Homes
Air quality in San Francisco is moderate (AQI 59), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Levoit Core 400S — True HEPA · CADR ~260 CFM · rooms up to 403 sq ft
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Air Quality Patterns
Understanding the best and worst air quality days in San Francisco can help you plan outdoor activities and protect your health.
View Current San Francisco Air Quality →PM2.5 Levels
Fine particulate matter data →
Ozone Levels
Ground-level ozone data →
Seasonal Guides
Air quality by season →
Health Effects
Learn about air pollution impacts →
Frequently Asked Questions About San Francisco Air Quality
What is the current air quality in San Francisco?
The current Air Quality Index (AQI) in San Francisco, CA is 59, which is considered moderate.
Is it safe to exercise outdoors in San Francisco?
Generally yes. With an AQI of 59, outdoor exercise is acceptable for most people. Sensitive individuals should monitor symptoms.
When is the best time of year to visit San Francisco for good air quality?
Spring and early fall typically offer the best air quality in San Francisco. Summer months may have elevated ozone levels, while winter can see higher PM2.5 from temperature inversions.
What causes air pollution in San Francisco?
Air pollution in San Francisco can come from vehicle emissions, industrial activity, construction, wildfires, and weather patterns. Local geography and seasonal factors also play a significant role.
Explore More Air Quality Data
Extra Protection for San Francisco Homes
Air quality in San Francisco is moderate (AQI 59), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Compare top-rated True-HEPA purifiers:
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