When will Chicago air quality improve amid ongoing wildfire smoke concerns?

Wildfire smoke from Canada has severely impacted air quality in Chicago and surrounding regions, including Minnesota, Iowa, and Wisconsin. The Illinois Environmental Protection Agency declared a Red Air Pollution Action Day after the AQI reached 329, with PM2.5 identified as the primary pollutant. Health officials warned that these hazardous levels can affect all individuals. Smoke remains visible across Illinois, Michigan, Ohio, Pennsylvania, and West Virginia, causing extended air quality alerts throughout the affected areas.