Riverside vs Stockton Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of September 23, 2026, Stockton, CA has cleaner air than Riverside, CA — AQI 55 (Moderate) vs 172 (Unhealthy), a gap of 117 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. Riverside's reading is driven by O3 and Stockton's by PM10.
Riverside, CA
Unhealthy
Stockton, CA
Moderate
Summary
Stockton has 117 points better air quality
Stockton has an AQI of 55 compared to 172
Reduce Indoor Ozone in Riverside
Today's main pollutant in Riverside is ground-level ozone (AQI 172). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Compare activated-carbon purifiers (for gases & ozone):
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 | Riverside | Stockton | Better |
|---|---|---|---|
| Today | AQI 122 | AQI 50 | Stockton |