Toronto faces dangerous air and heat levels as wildfire smoke and extreme humidity blanket the region; health alerts remain in place through Thursday.
Smoke-Filled Skies Prompt Health Alerts in Toronto
Toronto found itself among the world’s most polluted cities on Monday as wildfire smoke drifted across Ontario, prompting special air quality statements and heat warnings. Environment Canada has warned residents across the Greater Toronto Area to remain cautious, with the poor conditions expected to linger into Tuesday.
Wildfire Smoke from North Drives Air Quality Crisis
The smoke blanketing the city originates from wildfires burning across northern Ontario and parts of the Prairies. These blazes have already scorched 3.7 million hectares this year—making 2025 Canada’s second-worst wildfire season on record. The smoke has reduced visibility and significantly raised health risks, especially for children, seniors, pregnant individuals, and those with existing respiratory or heart conditions.
Toronto’s Global Pollution Ranking Raises Alarm
According to IQAir, a Swiss-based air quality monitoring firm, Toronto ranked as the second most polluted major city globally at 8 a.m. Monday. By 8 p.m., it still remained in the top ten. Residents were advised to avoid outdoor activity, seal indoor spaces, and use air purifiers if available.
Prolonged Heatwave Intensifies Health Threats
Simultaneously, Toronto is enduring a severe heatwave. Daytime highs between 31°C and 35°C, with humidex values reaching 42°C, are expected to last until Thursday night. Overnight lows, ranging from 19°C to 23°C, offer little respite. Environment Canada is urging people to stay hydrated, remain indoors, and avoid strenuous activity during peak heat hours.
Doctors Warn of Cumulative Health Impact
Cardiologist Dr. Christopher Labos told that the combination of wildfire smoke and heat places significant strain on both the lungs and heart. “If you’re young and healthy, you might be fine,” he said. “But with pre-existing conditions, this could easily push people into a crisis.”
He also recommended that those who must be outdoors consider wearing N95 masks. Pet owners were reminded that animals, particularly dogs, are equally vulnerable to heatstroke and poor air quality.
Public Health Tips and Emergency Signs to Watch
Environment Canada continues to emphasize the importance of monitoring for heat-related illnesses. Symptoms of heat exhaustion include headache, dizziness, nausea, and fatigue. Signs of heat stroke—such as confusion, rapid breathing, and unconsciousness—require immediate medical attention. Cooling the person and contacting emergency services is advised.
Officials also suggest checking in on elderly neighbours, keeping blinds closed, wearing loose, light-coloured clothing, and drinking water frequently—even before feeling thirsty.
Long-Term Outlook and Climate Warnings
This week’s dual weather warnings reflect broader climate concerns. Environment Canada has previously cautioned that extreme events like wildfires and heatwaves are expected to intensify due to climate change. As wildfires grow more frequent and summers hotter, experts are urging governments and citizens alike to better prepare for worsening environmental hazards.
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