Ontario Air Quality
Current air-quality information for Ontario, United States.
Air quality is generally considered satisfactory.
World Air Quality Index Project (WAQI) · Updated 2026-10-17T20:00:00-07:00Health context
At the current AQI of 28, Ontario is in the Good category on the displayed AQI scale. Most people can continue normal outdoor activities. Current pollutant values shown for Ontario are PM2.5 28 µg/m³, PM10 27 µg/m³, O₃ 26.4 µg/m³, NO₂ 5 µg/m³. The current reading is identified on this page as World Air Quality Index Project (WAQI).
Air-quality information is not medical advice. People with asthma, heart or lung disease, children, older adults and other sensitive groups may need to take additional precautions when pollution is elevated.
Recent History & Forecast
This chart shows atmospheric-model AQI history and forecast from Open-Meteo / Copernicus Atmosphere Monitoring Service (CAMS) model. It is separate from any monitoring-station observation shown in the Current AQI card.
What does AQI 28 mean in Ontario?
Ontario currently has an AQI of 28, which falls in the Good category. This indicates relatively low overall air pollution on the displayed AQI scale. Normal outdoor activity is generally appropriate for most people. The pollutant values currently shown for Ontario are PM2.5 28 µg/m³, PM10 27 µg/m³, O₃ 26.4 µg/m³, NO₂ 5 µg/m³. The displayed current conditions are identified as World Air Quality Index Project (WAQI).
Nearby cities
- Rancho Cucamonga air quality — approximately 7 km away
- Fontana air quality — approximately 20 km away
- Riverside air quality — approximately 26 km away
- San Bernardino air quality — approximately 34 km away
- Anaheim air quality — approximately 35 km away
- Santa Ana air quality — approximately 41 km away
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