Air Quality in San Francisco
San Francisco generally has good air quality but faces wildfire smoke challenges. Marine air helps disperse pollutants.
📊 AQI Monitoring
Bay Area AQMD monitors air quality across 9 counties. The region has strong air quality regulations.
Standard: EPA AQI & Canadian AQHI (AQI/AQHI)
⚠️ Key Pollutants
- Wildfire smoke
- Vehicle emissions
- Wood burning
- Ozone in summer
Local Regulations
BAAQMD Spare the Air program. Strict wood burning restrictions. Vehicle emission standards.
Understanding air quality in San Francisco
San Francisco's outdoor air is shaped mainly by wildfire smoke, vehicle emissions, wood burning. These climb during rush hours and settled, still weather when pollutants aren't dispersed — which is why local agencies monitor them closely and enforce the rules above.
Whatever today's AQI shows on the live data, the air inside your home is typically 2–5× more polluted than outdoors, and it's the part you can actually control. Sizing a MERV‑13 or HEPA purifier to your room is the most reliable way to protect San Francisco households on high‑pollution and wildfire‑smoke days — use the free ACH calculator to get the size right.
Outdoor Air in San Francisco Is Hard to Change. Indoor Air Isn't.
The EPA says indoor air can be 2-5x more polluted than outside. For San Francisco residents, the most effective long-term solution is a quality indoor air purifier — removing 90%+ of PM2.5, allergens, and pollutants where you spend most of your time.
Shop Clean Air KitsIndoor Air Quality Tips for San Francisco
- ✓PurpleAir network provides hyperlocal data
- ✓HEPA purifiers critical for wildfire season
- ✓N95 masks for outdoor smoke exposure
California Air Quality Resources
Get specialized guidance for California's unique air quality challenges - CARB regulations, wildfire smoke preparedness, and local AQMD resources.
Explore Clean Air California →Improve Your Indoor Air Quality
DIY HEPA & MERV air purifiers from $149. Effective, affordable solutions for San Francisco residents.
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