The highest AQ index in Illinois (as of 8:00 CDT) is currently the Chicago area. Particle Pollution (PM2.5) is measuring at 56 (Moderate). This means air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Over the next few days, the highest Particle Pollution (PM2.5) will be in the Aurora and Elgin area. It is forecasted to be Good, meaning air quality is satisfactory, and air pollution poses little or no risk.
SPECIAL STATEMENT: Locally higher particulate levels can occur near and downwind of fireworks displays. Persons, especially those susceptible to elevated fine particulates, should take precautions to avoid exposure to firework emissions.
| Range | 0 - 50 | 51 - 100 | 101 - 150 | 151 - 200 | 201 - 300 | 301 - 500 |
| Color | ||||||
| Category | Good | Moderate | Unhealthy for Sensitive Groups | Unhealthy | Very Unhealthy | Hazardous |
Last Updated 4 minutes ago
Below is a list of counties in Illinois. Click on any county below and you'll get a list of cities where we provide AQ index forecasts.