Air quality alerts issued
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Residents should should expect some relief by Thursday morning, Environment Canada said, with a cooler 14 C expected Thursday night.
Toronto is seen Monday; the Air Quality Health Index rating for the city was higher than 10, or "very high risk," from wildfire smoke that morning.
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World Cup being hosted by Canada, Mexico and the United States is less than a year away and FIFA's protocols for matches affected by wildfire smoke remain unclear.