WATCH: It isn't technically summer, but temperatures in the GTA could deceive anyone who goes outside. Erica Vella has a look at the latest on the heat warning and how people are staying cool.

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With temperatures expected to pass the 30-degree mark, Environment Canada has issued an air quality warning for much of southern Ontario.

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The affected area extends through the following regions: Belleville, Quinte, Northumberland, Hamilton, Toronto, Dunnville, Caledonia, Haldimand, Elgin, Halton, Peel, Huron, Perth, London, Middlesex, Niagara, Oxford, Brant, Sarnia, Lambton, Simcoe, Delhi, Norfolk, Waterloo, Wellington, Windsor, Essex, Chatham-Kent, York, Durham, Grey, Bruce, Peterborough and the Kawartha Lakes.

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The agency warns that there are possible high levels of air pollution Sunday and Monday which could lead to poor air quality.

On Saturday, Environment Canada issued a heat warning for much of Southern Ontario. It says the extreme temperatures will “cause increasing ground-level ozone concentrations”

The agency warns “individuals may experience symptoms such as increased coughing, throat irritation, headaches or shortness of breath. Children, seniors, and those with cardiovascular or lung disease, such as asthma, are especially at risk.”

Environment Canada states that those who have lung diseases, including asthma and COPD, are more likely to be aggravated by the effects of poor air quality.

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