Canada wildfire smoke triggers heat wave and poor air quality warnings in Toronto and the GTA; check who are at risk

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. Residents, especially vulnerable groups, are urged to take precautions, limit outdoor activities, and stay indoors as much as possible.