Wildfires in Canada are again causing unhealthy air quality in parts of the US, including Chicago and Milwaukee, with smoke plumes reaching Europe. Over 200 fires are burning in Canada, forcing evacuations and impacting firefighting efforts. While the burned area is smaller than last year's record, the fire season is early, and the risk remains high. Wildfire smoke poses significant health risks, including respiratory and cardiovascular issues, and long-term exposure increases mortality risk. Experts warn the health burden is likely underestimated, exacerbated by climate change and increased development in fire-prone areas. Protecting oneself involves monitoring air quality, using masks, and reducing indoor smoke.

Prepared by Olivia Bennett and reviewed by editorial team.