Wildfire smoke will continue to hang over Toronto on Monday, reducing air quality and limiting visibility across the city. Environment Canada confirms that the haze will affect much of southern Ontario throughout the day and may last into Tuesday before clearing. As a result, residents should take precautions, especially those who are more sensitive to poor air conditions.
By 6 a.m. Monday, the air quality health index (AQHI) in downtown Toronto reached six—classified as a moderate health risk by Air Quality Ontario. Forecasts show it could climb to seven by midday, indicating a high-risk level. In the evening, levels should drop to five, which presents a lower risk. These changes happen quickly because wildfire smoke shifts with wind and weather patterns.
Environment Canada warns that air quality and visibility can vary greatly over short distances and from hour to hour. Therefore, conditions may differ between neighborhoods. Because of this unpredictability, officials urge people to minimize outdoor time. They also recommend rescheduling outdoor activities to reduce exposure to harmful pollutants.
Breathing in wildfire smoke can cause several symptoms. Many people experience irritation in their eyes, nose, and throat, along with headaches or a mild cough. For some, especially those with respiratory conditions, symptoms can worsen to include wheezing, chest pain, or a severe cough. The smoke carries fine particulate matter (PM2.5), which can travel deep into the lungs and even enter the bloodstream.
Certain groups face higher risks. Young children, older adults, pregnant individuals, and anyone with heart or lung conditions like asthma or COPD should take extra care. Short-term exposure can still trigger serious reactions in these populations. That’s why staying indoors and monitoring symptoms is essential.
To keep indoor air clean, Environment Canada advises closing windows and doors as much as possible. Running an air conditioner on recirculate mode helps block smoky air from entering. If you own a HEPA air purifier, turn it on—this device effectively removes harmful particles from the air.
If you must go outside, wear a well-fitting respirator-type mask such as an N95 or KN95. These masks filter out fine particles in wildfire smoke. Cloth or surgical masks, however, do not offer the same level of protection.
Air quality expert Jed Kaplan highlighted the dangers of prolonged outdoor exposure during a CP24 interview. He explained that fine particles from ongoing forest fires can damage lung function. “It’s especially bad to be outside under those kinds of smoky conditions,” Kaplan told CP24’s Sijia Liu. He also urged people to use air conditioning or visit indoor public spaces like libraries or malls, where filtration systems typically maintain cleaner air.
Local authorities are closely tracking the situation. While no emergency alerts are active, public health teams continue to share updates through official channels. Schools and outdoor workplaces are reviewing conditions and adjusting schedules to protect students and staff.
Although this smoke event is less severe than past episodes, repeated exposure over several days still poses health risks. Even healthy individuals should pay attention to how they feel. Never ignore symptoms like shortness of breath or dizziness.
Compared to previous extreme smoke waves, this episode is milder. However, the growing frequency of wildfire seasons in Canada and the northern U.S. reflects a larger trend. Climate change is extending fire seasons and increasing the intensity of blazes, raising the chances of recurring air quality issues.
Ultimately, staying informed and taking action can protect your health. Limit outdoor time, seal your home, and use proper filtration to reduce your exposure to wildfire smoke. Simple steps make a meaningful difference.
