The heat warning issued last Friday for the Ottawa-Gatineau region should last until Thursday night, according to Environment Canada. Special air quality statements also linger Tuesday in western Quebec.

In Canada, the Air Quality Health Index (AQHI) is a scale developed to help people understand what the current air quality means for your health. It is an initiative among Environment Canada, Health Canada and the provincial governments.

Wildfire season is upon us, and smoke is reducing air quality through swaths of the country. Environment Canada suggests people check the Air Quality Health Index daily to determine how much time to spend outside.

Windsor-Essex, Chatham-Kent and Sarnia-Lambton can all expect elevated air pollution levels again Tuesday. Environment and Climate Change Canada has once again issued a special weather statement for the region. This time, the weather office says weather conditions are expected to cause increasing levels of ozone.

Wildfire season is upon us once again, and smoke is reducing air quality through swaths of the country. Environment Canada suggests people check the Air Quality Health Index daily to determine how much time to spend outside.

Toronto and the GTA are under a heat wave and poor air quality warning issued by Environment Canada on July 14, 2025, due to wildfire smoke from northern Ontario. The poor air quality is expected to persist from Monday into Tuesday.

Environment Canada is warning of poor air quality and extreme heat in Toronto on Monday as southern Ontario braces for a week filled with hot and humid weather.

As extreme heat continues to cast over the city of Toronto, Environment Canada is warning of poor air quality on Monday.

The Air Quality Health Index is expected to be as high as seven, or high risk, according to Environment Canada.