Wildfire smoke will worsen in the Northeast and Mid-Atlantic through Friday

Wildfire smoke from Canadian wildfires is expected to worsen air quality across the Northeast and Mid-Atlantic regions of the United States through Friday. Multiple news outlets, including The Washington Post, The New York Times, and local ABC affiliates, report that air quality alerts have been issued for millions of people. The smoke has caused hazardous air conditions, with unhealthy levels recorded on air quality index maps. Outdoor events in affected areas, including Chicago, have been impacted. Tracking maps show the smoke spreading from Canada into the U.S., prompting widespread health warnings.