St. Catharines: current Air Quality Health Index (AQHI)

Calculated at 3:00 am EDT Friday, July 11, 2025

3
3 pointer
1
2
3
4
5
6
7
8
9
10
+
low risk
(1 - 3)
moderate risk
(4 - 6)
high risk
(7 - 10)
very high risk

Forecast for St. Catharines

Forecast Air Quality Health Index maximums for St. Catharines
PeriodForecast maximum (Issued at 5:00 pm EDT July 10, 2025)
Thursday night4 - Moderate Risk Moderate Risk, Thursday night
Friday4 - Moderate Risk Moderate Risk, Friday

Health message for St. Catharines

At-risk population:

General population:

See the Ontario Ministry of the Environment, Conservation and Parks air quality health messages.

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