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Air Quality Ontario

Toronto Downtown: AQHI for September 21, 2025

Air Quality Health Index categories, values and associated colours
Air Quality Health Index categories and values
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Low risk
(1 - 3)		 Moderate risk
(4 - 6)		 High risk
(7 - 10)		 Very high risk
 
Air Quality Health Index readings by date.
Date Time AQHI Category
2025-09-2112:00 am EDT2Low Risk, 12:00 am EDTlow risk
2025-09-211:00 am EDT2Low Risk, 1:00 am EDTlow risk
2025-09-212:00 am EDT2Low Risk, 2:00 am EDTlow risk
2025-09-213:00 am EDTN/AAQHI not available for, 3:00 am EDT
2025-09-214:00 am EDTN/AAQHI not available for, 4:00 am EDT
2025-09-215:00 am EDT3Low Risk, 5:00 am EDTlow risk
2025-09-216:00 am EDT3Low Risk, 6:00 am EDTlow risk
2025-09-217:00 am EDT3Low Risk, 7:00 am EDTlow risk
2025-09-218:00 am EDT3Low Risk, 8:00 am EDTlow risk
2025-09-219:00 am EDT2Low Risk, 9:00 am EDTlow risk
2025-09-2110:00 am EDT2Low Risk, 10:00 am EDTlow risk
2025-09-2111:00 am EDT8High Risk, 11:00 am EDThigh risk
2025-09-2112:00 pm EDT9High Risk, 12:00 pm EDThigh risk
2025-09-211:00 pm EDT9High Risk, 1:00 pm EDThigh risk
2025-09-212:00 pm EDT7High Risk, 2:00 pm EDThigh risk
2025-09-213:00 pm EDT7High Risk, 3:00 pm EDThigh risk
2025-09-214:00 pm EDT7High Risk, 4:00 pm EDThigh risk
2025-09-215:00 pm EDT6Moderate Risk, 5:00 pm EDTmoderate risk
2025-09-216:00 pm EDT6Moderate Risk, 6:00 pm EDTmoderate risk
2025-09-217:00 pm EDT5Moderate Risk, 7:00 pm EDTmoderate risk
2025-09-218:00 pm EDT5Moderate Risk, 8:00 pm EDTmoderate risk
2025-09-219:00 pm EDT4Moderate Risk, 9:00 pm EDTmoderate risk
2025-09-2110:00 pm EDT4Moderate Risk, 10:00 pm EDTmoderate risk
2025-09-2111:00 pm EDT4Moderate Risk, 11:00 pm EDTmoderate risk

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AQHI readings on this web page are based on automatically polled data and have not undergone final verification.