Smoke from numerous active wildfires in Canada has spread into the United States, leading to air quality alerts affecting over 20 states and millions of people. The smoke, primarily originating from northern Ontario, has traveled across the Midwest and Northeast, resulting in unhealthy to hazardous air quality conditions in several areas. Major cities such as Chicago, Detroit, and Minneapolis are experiencing some of the worst air quality, with haze and smoke also reaching New York, Boston, and Washington, D.C.
Health officials are advising the public to minimize outdoor activities, particularly for vulnerable groups such as children, older adults, pregnant women, and those with heart or lung conditions. Authorities across several states have urged residents to stay indoors whenever possible due to the elevated levels of air pollution.
New York officials have issued warnings that this smoke event could become the city’s most significant since 2023 when smoke from Canadian wildfires enveloped the region in a thick orange haze. In response, the state has distributed thousands of N95 masks and increased access to cooling centers, as high temperatures and poor air quality persist.
Weather agencies predict that these smoky conditions will continue in parts of the Midwest and Northeast through Friday. However, rain is forecasted in some areas later in the weekend, which could contribute to improvements in air quality.
The extensive spread of smoke has reignited concerns about the increasing impact of large-scale wildfires and their cross-border effects on public health and the environment.