Poor air quality is expected to persist through this evening due to a combination of smoke from forest fires and increasing of ground level ozone.###As smoke levels increase, health risks increase. Limit time outdoors. Consider reducing or rescheduling outdoor sports, activities and events.You may experience mild and common 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.People more likely to be impacted by outdoor air pollution, including people aged 65 and older, pregnant people, infants and young children, people with an existing illness or chronic health condition, and people who work outdoors, should reduce or reschedule strenuous activities outdoors and seek medical attention if experiencing symptoms.Visit http://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.Please continue to monitor alerts and forecasts issued by Environment Canada.

A prolonged period of extreme heat and humidity continues.What:Daytime highs of 31 to 35 degrees Celsius and a humidex of 37 to 42.Overnight lows of 19 to 23 degrees Celsius, providing little relief from the heat.When:Continuing through to Thursday night.Additional information:Southern Ontario will experience hot and humid conditions now through much of this week. A shift in the weather pattern late this week will likely end this multi-day period of heat and humidity Thursday night.###For more information: https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/how-protect-yourself.html https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/who-is-at-risk.htmlPlease continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.