Ontario
3 monitoring stations · readings from 50 to 52
Average AQI
Air quality in Ontario
Air quality in Ontario is currently 51 on the AQI scale, which falls in the Moderate band. That number is the average across every monitoring station reporting in Ontario right now.
We aggregate 3 stations across Ontario. Individual stations range from 50 at the cleanest to 52 at the worst, so conditions vary across Ontario — the local figure matters more than the average.
Ontario breaks down into 3 stations you can open individually. Of those listed below, South Pinehurst Place is reading highest at 52 and Ontario Mills Parkway lowest at 50.
Readings refresh hourly from the official monitoring networks we track. Conditions can change quickly, so check back before planning time outdoors.
What to do at moderate levels
Outdoor activity
Fine for most people. If you are planning a long or intense session outdoors, the early morning is usually cleaner.
Sensitive groups
Unusually sensitive people may notice mild irritation. Keep reliever medication to hand if you use it.
Indoor air
Ventilating is still worthwhile. Consider closing up during traffic peaks if you live on a busy road.
Stations in Ontario
About Ontario
Coordinates
34.043, -117.587
Centroid of monitored stations
Stations
3
Reporting in this area
Spread
50 – 52
Cleanest to worst station reading
Ontario air quality, answered
Ontario is currently reading an AQI of 51, which is Moderate. It is the average across 3 reporting stations.
Fine for most people. If you are planning a long or intense session outdoors, the early morning is usually cleaner. Unusually sensitive people may notice mild irritation. Keep reliever medication to hand if you use it.
51 sits in the Moderate band of the air quality index. The index runs from 0 to 500, and the lower the number the cleaner the air.
We currently aggregate 3 stations in Ontario, reading between 50 and 52.
Of the stations currently listed for Ontario, South Pinehurst Place is reading highest at 52 (Moderate).
Hourly. We pull from the official monitoring networks that publish for this city, and this page refreshes on the same cadence.
See Ontario on the map.
Every station around it, live — or find out what today's reading means for you personally.