Air Quality Alerts Issued Across Illinois and Michigan Due to High Ozone Levels.

The entire state of Illinois is under an air quality alert due to increased ground-level ozone caused by emissions from vehicles, power plants, and other industrial sources reacting with sunlight. The alert is forecasted to be "unhealthy for sensitive groups" on Friday and Saturday, posing a potential health hazard to people with respiratory or pulmonary disorders. Officials advise caution when outdoors, limiting physical activity, and taking special precautions for sensitive individuals. Businesses and people are encouraged to reduce air pollution by taking public transportation, consolidating errands, reducing energy demands, and avoiding gasoline-powered equipment.