Chicago air quality to drop again Saturday, smoky conditions from Canadian wildfires to return

Key Points:

• An Air Quality Alert remains in effect for the Chicago area due to smoke from Canadian wildfires, with air quality expected to worsen to "unhealthy for sensitive groups" on Saturday afternoon as smoke returns.
• Winds are forecast to bring smoky, hazy conditions back into Chicago by sunset Saturday, with smoke lingering into Sunday despite some relief earlier in the day; rain and severe weather risks are also expected.
• Canadian wildfires, intensified by climate change, have led to evacuations in northern Ontario, prompting criticism from U.S. President Trump regarding Canada's forest management and threats of tariffs.
• Health experts warn that wildfire smoke contains harmful pollutants that can have lasting effects on eyes and respiratory health, advising people to limit outdoor exposure and maintain indoor air quality by checking HVAC filters.
• The smoke has caused low visibility and delays at O'Hare airport, with officials recommending people stay indoors, stay hydrated, and use vehicle air conditioning in recirculate mode to reduce smoke exposure.