Austin vs San Antonio Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of September 23, 2026, Austin, TX has cleaner air than San Antonio, TX — AQI 47 (Good) vs 55 (Moderate), a gap of 8 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. Austin's reading is driven by O3 and San Antonio's by PM2.5.
Austin, TX
Good
San Antonio, TX
Moderate
Summary
Austin has 8 points better air quality
Austin has an AQI of 47 compared to 55
Extra Protection for San Antonio Homes
Air quality in San Antonio is moderate (AQI 55), 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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