Toronto air quality ranked worst in the world, orange alert in effect

An orange haze has washed over Toronto’s skyline as wildfire smoke drifts into the region, leaving Toronto with some of the worst air quality in the world on Wednesday.

An air quality warning, orange alert, has been issued for the city on Wednesday as smoke from forest fires in northwestern Ontario move south.

12:50 p.m.- Vaughan cancels FIFA event

The City of Vaughan said Wednesday that it will be cancelling today’s Canada Celebrates the FIFA World Cup 2026 semi-final celebration at Assembly Park.

12:20 p.m.- FIFA Fan Festival cancelled, wading pools closed

The City of Toronto says that the air quality warning has prompted officials to cancel today’s FIFA Fan Festival.

“The decision was made to prioritize the health and safety of attendees, as well as police, fire, paramedics, event staff, volunteers and other personnel supporting the event as they would be exposed to air quality conditions for an extended period of time,” the city said in a written statement.

“The cancellation of FIFA Fan Festival Toronto allows emergency services, including Toronto Paramedic Services, Toronto Fire Services and Toronto Police Service, to remain fully available to support public safety needs during the Air Quality Warning.”

The match broadcast at Nathan Phillips Square today has also been scrapped.

The city confirmed that wading pools will be closed for the remainder of the day.

11 a.m.- City modifies outdoor programming

The City of Toronto has confirmed that all outdoor CampTO field trips and registered outdoor programs have been “cancelled, postponed, or moved indoors where possible” today.

9 a.m.- ‘It is intensifying’

Dr. Jeffrey Siegel, a professor with the University of Toronto’s department of Civil and Mineral Engineering, said the health impact to residents in the city, including otherwise healthy individuals, is “very significant.”

“It is intensifying and we are going to have certainly for the rest of today and probably into tomorrow some very unhealthy conditions,” he told CP24’s Courtney Heels.

“Unfortunately, it comes along with the heat wave and so we’ve kind of got a double whammy.”

He said it is unusual for Toronto to take the top spot for worst air quality in the world.

“We’ve seen this increasing in frequency,” he said. “I think this represents something like the new normal.”

8:30 a.m.- Environment Canada issues orange alert

“Poor air quality may persist into Thursday for some areas,” the national weather agency said in its alert.

“As smoke levels increase, health risks increase. Limit time outdoors. Consider reducing or rescheduling outdoor sports, activities and events.”

The national weather said smoke may cause mild symptoms, such as eye, nose, and throat irritation, headaches or a mild cough.

“More serious but less common symptoms include wheezing, chest pains or severe cough. If you think you are having a medical emergency, seek immediate medical assistance,” Environment Canada said in its advisory.

Those at greater risk of health issues related to poor air quality include people over the age of 65, pregnant people, infants and young children, and people with existing illness or chronic health conditions.

8:15 a.m.- Heat alert remains in effect

A heat alert remains in effect for Toronto today with the mercury rising to 33 C today, feeling closer to 36 with humidity.

“We are still under that heat dome that stretches from southern portions of Saskatchewan through Manitoba, almost the entire province of Ontario, and into Quebec as well,” Smith said.

Environment Canada notes that the heat and humidity are exacerbating issues with air quality.

“Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high-risk category,” the national weather agency said.

“Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water.”

8 a.m.- Toronto air quality ranked worst in the world

As of about 8 a.m. on Wednesday, Toronto’s air quality was ranked the worst in the world, according to IQAir, which tracks global air quality data.

“We have a very smoky start to the day. I know it may look like fog but we are contending with wildfire smoke,” CP24 Weather Specialist Jess Smith said on Wednesday morning.

“It doesn’t get better throughout the day today, unfortunately.”

Environment Canada said conditions may improve on Friday.

Share your photos of the wildfire smoke with us by emailing torontonews@bellmedia.ca.