This policy spotlight explains how Illinois’ air pollution is monitored, describes trends in air pollution levels, and discusses the potential health consequences. In Illinois, the highest pollution levels are in the Chicago area, though these levels have notably decreased over the past two decades. If recent progress continues, Illinois can expect significant increases in life expectancy and quality of life. However, events such as the 2023 Canadian wildfires underscore that pollution levels in Illinois could be severely disrupted by climate change.
“As a major transportation hub, Chicago experiences significant emissions from planes, trains and automobiles, compounded by its dense population of nearly 10 million residents. Chicago’s geographic location on Lake Michigan exacerbates pollution through temperature inversions, where cool air becomes trapped by warmer layers, particularly in winter and summer months,” Reif said.
