Millions at Risk as Canada Wildfire Smoke Spreads.

High-risk air quality warnings have been issued for millions of people across North America due to ongoing wildfires in Canada. Wildfire smoke has blanketed major cities in Ontario and Quebec, including Toronto and its surrounding areas. The smoke has reached as far as New York City and Connecticut, where air quality has been classified as "unhealthy". Public health officials have cautioned people not to exercise outside and to minimise their exposure to the smoke as much as possible, as the air poses immediate and long-term health risks.