Toronto and much of the GTA are under a special air quality statement as smoke from forest fires in northern Ontario pushes into the region, Environment Canada warned Sunday night.

The agency says westerly winds are carrying smoke into the area, reducing visibility and pushing the Air Quality Health Index to seven, classified as “high risk.” Poor air quality is expected to persist into Monday, Environment Canada added.

Residents are advised to limit the time spent outdoors and consider rescheduling outdoor sports or events. Mild symptoms include eye, nose, or throat irritation, mild coughing or headaches.

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 are most at risk, Environment Canada says, adding that more serious symptoms such as chest pain or severe coughing should be treated as medical emergencies.