Illinois Current AQI Today: 5 Cities Ranked (Moderate)
Real-time air quality data for 5 cities in Illinois. Average AQI across the state is currently 56 (Moderate).
Cities in Illinois
Sorted by air quality (best first)
About Air Quality in Illinois
Illinois air quality is largely determined by conditions in the Chicago metropolitan area, one of the largest urban areas in the country. While Chicago has made significant progress in reducing pollution, the city still experiences ozone and particulate matter challenges. Downstate Illinois generally has good air quality with occasional impacts from regional transport.
We monitor air quality across 5 major cities in Illinois using real-time data from the EPA's AirNow network. The best air quality is currently in Rockford with an AQI of 46. The area requiring most attention is Chicago with an AQI of 69.
Primary Pollution Sources in Illinois
- Vehicle emissions, especially highway traffic
- Industrial facilities in northwest Indiana affecting Chicago
- Power plants
- Aviation emissions from major airports
- Lake effect weather patterns
- Regional transport from other states
Seasonal Air Quality Patterns
Summer brings the highest ozone levels, particularly along the Lake Michigan shore where lake breezes can concentrate pollutants. Winter can see elevated particulate matter from heating systems and temperature inversions. Spring and fall generally have better air quality.
Health Impacts
Chicago's South and West Side communities, often located near highways and industrial areas, face disproportionate air quality impacts. Asthma rates are elevated in affected neighborhoods. Lake shore residents can experience rapid air quality changes due to lake effect weather.
Recommendations for Illinois Residents
Chicago residents should check air quality forecasts before outdoor exercise, especially during summer. Living near Lake Michigan doesn't guarantee better air quality due to lake effect patterns. Support local clean energy initiatives and use public transit when possible.
Frequently Asked Questions About Illinois Air Quality
What is the current air quality in Illinois?
The average Air Quality Index across 5 monitored cities in Illinois is currently 56, which is considered moderate. 3 cities currently have good air quality (AQI 0-50).
Which city in Illinois has the best air quality?
Currently, Rockford has the best air quality in Illinois with an AQI of 46 (Good). Air quality rankings can change throughout the day based on weather conditions, traffic patterns, and other factors.
Is it safe to exercise outdoors in Illinois?
With a state average AQI of 56, outdoor exercise is generally safe but sensitive individuals should monitor their symptoms. Check your local city's AQI before strenuous outdoor activities.
How can I protect myself from poor air quality in Illinois?
To protect yourself from air pollution: monitor AQI forecasts daily, limit outdoor activities when AQI exceeds 100, use air conditioning or air purifiers with HEPA filters indoors, consider wearing N95 masks during very poor air quality, and keep windows closed when pollution levels are elevated. Sensitive groups should take extra precautions.