Wildfire Smoke Chokes Ontario as Toronto Faces Severe Air Quality Warning

Wildfire smoke combined with intense summer heat is placing large parts of Ontario under growing health pressure, as thick smoke spreads across Toronto and other communities in southern Ontario, sharply reducing air quality and visibility.

Environment and Climate Change Canada issued an orange-level air quality warning for Toronto, saying smoke from wildfires burning in northwestern Ontario was causing extremely poor air quality. Smoky conditions were expected to continue before gradually improving as weather patterns shifted.

Toronto’s Air Quality Health Index reached the high-risk category and was forecast to rise into the very high-risk range, increasing concerns for residents with respiratory or cardiovascular conditions.

Toronto was also listed among the world’s most polluted major cities as wildfire smoke turned the sky a deep yellow-orange and left a noticeable smell of smoke across several neighbourhoods. The smoke was not limited to Canada, with the haze also reaching parts of the northeastern United States.

The City of Toronto cancelled outdoor activities, including a FIFA World Cup fan event and a public viewing gathering scheduled at Nathan Phillips Square, because of the deteriorating air quality and the potential health risks associated with prolonged outdoor exposure.

In northern Ontario, rapidly expanding wildfires continued to threaten residential areas and First Nations communities, prompting evacuation orders and emergency alerts in several locations.

Communities affected by evacuation measures included Armstrong and areas connected to the Lac La Croix, Collins, Whitesand and Lac des Mille Lacs First Nations.

Video footage from the region showed a Canadian National Railway train surrounded by flames near Armstrong. Crew members were safely evacuated, while rail service in the affected area was temporarily suspended as a precaution.

Some residents in remote communities were forced to leave by boat after approaching fires made roads unsafe or blocked land-based evacuation routes.

The smoke emergency comes as Ontario continues to experience high temperatures and humidity, making it more difficult for residents to protect themselves from both heat and air pollution.

Health authorities recommend keeping windows and doors closed to prevent smoke from entering homes. However, when wildfire smoke and extreme heat occur at the same time, residents are advised to prioritize staying in a cool indoor location.

People are being encouraged to reduce the amount of time they spend outdoors and postpone strenuous exercise and outdoor events.

Children, older adults, pregnant women, outdoor workers and people living with heart disease, lung conditions or other chronic illnesses face a greater risk of experiencing health effects from wildfire smoke.

Common symptoms of smoke exposure can include eye, nose and throat irritation, headaches and mild coughing. More serious symptoms may include difficulty breathing, chest pain, wheezing or severe coughing and may require immediate medical attention.

Residents are also advised to use indoor air purifiers or high-efficiency air filters when available. A well-fitted N95 respirator can help reduce exposure to fine smoke particles when going outdoors, although it cannot completely eliminate the health risks.

Hundreds of wildfires remain active across Canada, including dozens classified as out of control, as the total area burned during the current wildfire season continues to increase.