Air: median AQI: ranking of metro areas in Illinois
Order: highest value first. Lower is better.
Air: median AQI: ranking of metro areas in Illinois: Chicago ranks first (56 AQI) and Rockford last (43 AQI). The median across 3 the state's metro areas is 44 AQI. Observation period: 2024. Source: EPA AirData, annual AQI by CBSA.
Median value of the air quality index over the year across the metro area's monitoring stations. Lower means cleaner. The stations do not cover the whole territory.
Data quality: measured at monitoring stations; coverage of the metro area is incomplete.
Only places with a value for the indicator are ranked; a gap is not a zero. A ranking on one indicator is not an assessment of a place to live.