Environment Canada has issued an orange-level air quality warning for the Greater Toronto Area (GTA) on Friday, with temporary relief anticipated in the afternoon before heavy smoke returns later in the day.The warning, which remains in place despite slight improvements overnight, is attributed to drifting smoke from forest fires in northwestern Ontario.PM 2.

5 levels, which measure fine particulate matter in the air, have decreased compared to Thursday but remain high in areas like Brampton and Mississauga.The provincial air quality health index indicates very high risk in Brampton and Mississauga, while Toronto East and Oshawa face lower risks.

Health officials advise vulnerable populations, including seniors, young children, and those with preexisting conditions, to avoid outdoor activities.The GTA ranks among the world’s most polluted cities, according to IQAir.

While some relief is expected during the day, heavy smoke is likely to persist into the weekend, prompting warnings about potential health impacts such as respiratory irritation and chest pain.Residents are urged to monitor updates and take precautions to minimize exposure.