"Canadian Wildfires Continue to Pollute Chicago's Air with Unhealthy Smoke"

Wildfires in western Canada have caused a plume of unhealthy smoke to spread into the United States, leading to air quality alerts in at least eight states. Chicago is particularly affected, with an air quality alert in effect until midnight. The smoke contains pollutants that can cause breathing difficulties and other health issues. The Midwest will continue to experience poor air quality and decreased visibility in the coming days. The smoke is a result of nearly 400 fires in British Columbia, sparked by lightning strikes, and Canada is currently experiencing its worst fire season on record.