It’s not just the heat and humidity, it’s the haze as well.
Along with a heat warning, Environment Canada has issued a special air quality statement with increased ground-level ozone concentrations in the area.
Officials say kids, including teenagers, are at higher risk from outdoor air pollution because they often spend time being active outdoors and their lungs are still developing.
Residents are urged to avoid using gas powered equipment, such as lawnmowers, also helps reduce outdoor air pollution.
The hot and humid conditions will persist into Thursday, with conditions starting to improve Thursday evening.
Visit www.airhealth.ca for information on how to reduce your health risk and your personal contribution to pollution levels, as well as for current and forecast AQHI values.