The Willis Tower (formerly Sears Tower) is pictured in downtown Chicago, where the air quality has been categorized "unhealthy" by the U.S. Environmental Protection Agency, on June 27, 2023. The EPA says extensive swaths of the northern United States awoke to unhealthy air quality Monday, July 17, or were experiencing it by midafternoon. Fine particle pollution caused by smoke from Canada’s wildfires is causing a red zone air quality index, meaning it is unhealthy for everyone. (AP Photo/Claire Savage, file)
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