San Diego vs San Jose Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of November 8, 2026, San Diego, CA has cleaner air than San Jose, CA — AQI 34 (Good) vs 48 (Good), a gap of 14 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. San Diego's reading is driven by O3 and San Jose's by PM2.5.
San Diego, CA
Good
San Jose, CA
Good
Summary
San Diego has 14 points better air quality
San Diego has an AQI of 34 compared to 48
Our Pick
Improve Indoor Air Quality
Even with good outdoor air in San Jose, indoor PM2.5, dust and allergens build up. A True-HEPA purifier keeps a bedroom or office consistently clean.
Budget Pick4.7(74,000+ ratings)
Levoit Core 400S
True HEPA · CADR ~141 CFM · rooms up to 219 sq ft
Best value True-HEPA for everyday allergens, dust and dander
Compare top-rated True-HEPA purifiers:
Budget Pick
Levoit Core 400S
True HEPA
True HEPA · CADR ~141 CFM · rooms up to 219 sq ft
~$1004.7
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 →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 →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
| Day | San Diego | San Jose | Better |
|---|---|---|---|
| Today | AQI 54 | AQI 55 | San Diego |
| Sun, Nov 8 | AQI 61 | AQI 58 | San Jose |