Canadian Wildfire Smoke Triggers U.S. Air Quality Alerts Amid Cyclosporiasis Outbreak
Wildfire smoke from Canada continues to drift into the United States, causing air quality alerts in multiple regions. This issue coincides with a cyclosporiasis outbreak linked to contaminated lettuce, which has sickened thousands across 41 states. As of July 24, 2026, the Centers for Disease Control and Prevention (CDC) reported 4,173 confirmed cases of the illness, with an additional 7,400 suspected cases, particularly in Michigan and Ohio. The smoke, originating from out-of-control Canadian wildfires, has left skies in parts of the U.S. darkened and orange-tinted. In Toronto, air pollution recently ranked as the worst globally, while New York City was listed as the fifth worst, according to IQAir. President Donald Trump addressed these issues during a press conference, jokingly suggesting tariffs on Mexico for lettuce and Canada for smoke.