Air Quality Ontario

An air quality alert is currently in effect for select areas in Ontario.

Visit Environment and Climate Change Canada (ECCC) Weather Information for detailed information on the active alert.

Our website will be updated soon to reflect Environment and Climate Change Canada’s new colour coded alert system.

North Bay: hourly ozone O₃ concentrations

From March 2, 2026 EST to March 4, 2026 EST.

Notes:

Ontario 1-hour Ambient Air Quality Criterion (AAQC) for O₃ = 80 ppb.
The pollutant concentrations on this web page are based on automatically polled data and have not undergone final verification.