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A heat wave or conditions of extreme heat occur when temperatures hit 32 degrees Celsius or higher, for three or more days in a row. These extreme hot weather events can lead to:
Humidex values measure how hot the weather feels to the average person. Under normal conditions, your body produces sweat that evaporates to cool you down. Under extreme heat, the body must work harder to maintain its normal temperature. A humidex advisory is issued when humidex values are expected to reach 40 or more. The higher the humidex, the harder it is for your body to cool itself.
Smog levels indicate and forecast the current air quality information. Most smog days in Ontario occur between May and September. When an alert is issued, avoid strenuous physical outdoor activities. If you have a heart or lung condition, consult your family doctor on how to keep healthy in the heat.
For more information on extreme heat alerts and how to stay cool, refer to the Peel Region.