San Diego vs Fresno Air Quality Comparison

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

As of September 23, 2026, San Diego, CA has cleaner air than Fresno, CA — AQI 58 (Moderate) vs 74 (Moderate), a gap of 16 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. San Diego's reading is driven by PM2.5 and Fresno's by PM10.

San Diego, CA

Moderate

StateCalifornia
Dominant PollutantPM2.5
CategoryModerate
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Fresno, CA

Moderate

StateCalifornia
Dominant PollutantPM10
CategoryModerate
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Summary

San Diego has 16 points better air quality

San Diego has an AQI of 58 compared to 74

Our Pick

Extra Protection for Fresno Homes

Air quality in Fresno is moderate (AQI 74), with particle pollution 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
~$230
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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 DiegoFresnoBetter
TodayAQI 55AQI 61San Diego

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