Toronto is currently grappling with a dangerous combination of extreme heat and poor air quality, posing significant health risks to its residents. On Monday, July 14, 2025, the city experienced a dramatic decline in air quality due to smoke from northern Ontario forest fires, prompting health officials to issue warnings and advisories.
The primary concern is the Air Quality Health Index (AQHI), which exceeded 10, indicating a "very high risk." Simultaneously, a heat warning is in effect, with daytime highs reaching 31°C (88°F), but feeling closer to 40°C (104°F) with humidity. This dual threat necessitates heightened awareness and proactive measures to protect public health.
According to the Canadian Lung Association, exposure to wildfire smoke can cause a range of health problems, including eye and throat irritation, coughing, and difficulty breathing. The elderly, children, and individuals with pre-existing respiratory conditions are particularly vulnerable. The City of Toronto has opened cooling centers and is distributing information about how to stay safe during this period of extreme heat and poor air quality. The city also advises residents to limit outdoor activities and monitor for symptoms related to smoke exposure. The poor air quality is expected to persist, potentially into Tuesday.
The city's response includes public service announcements and updates on social media, emphasizing the importance of staying informed and taking precautions. Residents are encouraged to check the AQHI and heat warnings regularly and to adjust their activities accordingly. The situation underscores the importance of preparedness and community support in the face of environmental challenges.