Persistent Poor Air Quality in Chicago Due to Canadian Wildfires

The air quality in Chicago is gradually improving after being affected by smoke from Canadian wildfires, but experts warn that pollution levels may increase again due to upcoming events such as the NASCAR Street Race, Fourth of July festivities, and holiday travel. While the air quality is expected to move to "moderate" over the weekend, it may not reach "good" levels until next week. Rain can help improve air quality by clearing out smoke particles, but it won't be a quick fix. The city advises residents to limit outdoor activities and wear masks when the air quality is unhealthy.