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TORONTO, July 15, 2026 — Environment and Climate Change Canada has issued an Orange Air Quality Warning for Toronto as smoke drifting from wildfires in northwestern Ontario continues to blanket much of southern Ontario.
The smoke is causing very poor air quality and reduced visibility across the city, with conditions expected to persist through Thursday before improving as early as Friday morning.
Toronto has the worst air quality in the world today
As of Wednesday morning, Toronto had the worst air quality of any major city in the world, according to IQAir’s live global rankings, ahead of Kinshasa, Delhi and Dubai. Environment Canada also reported the Air Quality Health Index had reached 10+, its highest “Very High Risk” category, as smoke spread across the GTA.
Unlike many air quality advisories, officials warn that everyone’s health can be affected during periods of heavy wildfire smoke, regardless of age or existing health conditions.
Outdoor activities should be limited
Residents are being urged to limit the amount of time they spend outdoors and consider postponing or cancelling outdoor sports, recreational activities and events until air quality improves.
Smoke from wildfires contains fine particles that can irritate the eyes, nose and throat and may cause headaches or a mild cough. More serious symptoms can include wheezing, chest pain and severe coughing. Anyone experiencing severe symptoms or a medical emergency should seek immediate medical attention.
Those at greatest risk
While the poor air quality can affect everyone, Environment and Climate Change Canada says certain groups are more vulnerable to the health impacts of wildfire smoke, including:
- Adults aged 65 and older
- Pregnant people
- Infants and young children
- People with heart or lung disease, asthma or other chronic health conditions
- People who work outdoors
Those at higher risk should avoid strenuous outdoor activities and seek medical advice if symptoms develop or worsen.
Keep indoor air as clean as possible
Officials recommend keeping windows and doors closed as much as possible to reduce the amount of smoke entering your home. If you use a ventilation system, install the highest-quality air filter it can accommodate or use a certified portable air purifier designed to remove fine particles.
With Toronto also experiencing hot summer temperatures, officials advise residents to prioritize staying cool if indoor temperatures become unsafe.
If you must be outdoors, limit the amount of time you spend outside. A properly fitted NIOSH-certified N95 respirator or equivalent mask can help reduce exposure to harmful fine particles, although it does not eliminate all health risks.
Residents are also encouraged to check on neighbours, family members and friends who may be more vulnerable to the effects of wildfire smoke, particularly older adults and those with chronic health conditions.
Environment and Climate Change Canada says the smoke is expected to linger through Thursday, with improving conditions possible by Friday morning, depending on wind patterns and wildfire activity.
Toronto residents should continue monitoring local forecasts and air quality advisories, as conditions can change quickly while wildfire smoke remains over the region.
