San Francisco vs San Jose Air Quality Comparison

Which city has cleaner air right now, from the latest EPA AirNow AQI

As of September 16, 2026, San Francisco, CA has cleaner air than San Jose, CAAQI 36 (Good) vs 53 (Moderate), a gap of 17 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. San Francisco's reading is driven by PM2.5 and San Jose's by PM2.5.

San Francisco, CA

Good

StateCalifornia
Dominant PollutantPM2.5
CategoryGood

San Jose, CA

Moderate

StateCalifornia
Dominant PollutantPM2.5
CategoryModerate

Summary

San Francisco has 17 points better air quality

San Francisco has an AQI of 36 compared to 53

Our Pick

Extra Protection for San Jose Homes

Air quality in San Jose is moderate (AQI 53), 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.

Large Room4.6(8,000+ ratings)
Coway AP-1512HH Mighty
True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
True HEPA + carbon, high CADR — clears PM2.5 from most rooms fast, our all-round pick

Compare top-rated True-HEPA purifiers:

Large Room
Coway AP-1512HH Mighty
HEPA + Carbon
True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
~$2304.6
Check Price on Amazon →
Editor's Pick
Levoit Vital 200S
True HEPA
True HEPA · washable pre-filter · rooms up to 1,875 sq ft
~$2004.6
Check Price on Amazon →
Budget Pick
Levoit Core 400S
True HEPA
True HEPA · CADR ~141 CFM · rooms up to 219 sq ft
~$1004.7
Check Price on Amazon →

Prices are approximate and subject to change. As an Amazon Associate, we earn from qualifying purchases at no extra cost to you.

5-Day Forecast Comparison

DaySan FranciscoSan JoseBetter
TodayAQI 44AQI 37San Jose
Wed, Sep 16AQI 50AQI 37San Jose