Air Quality Index

Issued April 20, 2015 @ 03:24 PM CDT

Sector AQI Yesterday AQI Today Critical Pollutant Forecast Tomorrow
LAKE COUNTY  41   26   PARTICULATES  GOOD  
CHICAGO  44   47   PARTICULATES  GOOD  
SOUTH & WEST SUBURBS  44   33   PARTICULATES  GOOD  
NORTH & WEST SUBURBS  43   39   NITROGEN DIOXIDE  GOOD  
AURORA-ELGIN  40   26   PARTICULATES  GOOD  
WILL COUNTY  44   30   PARTICULATES  GOOD  
ROCKFORD  47   26   PARTICULATES  GOOD  
QUAD CITIES  54   28   OZONE  GOOD  
PEORIA  54   27   OZONE  GOOD  
CHAMPAIGN/URBANA  51   32   PARTICULATES  GOOD  
BLOOMINGTON/NORMAL  53   28   OZONE  GOOD  
DECATUR  53   27   OZONE  GOOD  
SPRINGFIELD  53   28   OZONE  GOOD  
METRO EAST  35   30   OZONE  GOOD  
Descriptor Category Color Codes
Good 0-50 Unhealthy 151-200
Moderate 51-100 Very Unhealthy 201-300
Unhealthy for Sensitive Groups 101-150 Hazardous 301-500
AQI Ranges and Descriptor Categories Health Effects Cautionary Statements
0 - 50 Good    
51 - 100 Moderate    
101 - 150 Unhealthy for Sensitive Groups Increased liklihood of respiratory symptoms and breathing discomfort in sensitive groups. Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor activity.
151 - 200 Unhealthy Greater liklihood of respiratory symptoms and breathing difficulty in sensitive groups. Active children and adults, and people with respiratory disease, such as asthma, should avoid heavy outdoor exertion; everyone else, especially children, should limit heavy outdoor exertion.
201 - 300 Very Unhealthy Increasingly severe symptoms and impaired breathing likely in sensitive groups. Active children and adults, and people with respiratory disease, such as asthma, should avoid all outdoor exertion; everyone else, especially children, should limit outdoor exertion.
301 - 500 Hazardous Severe respiratory effects and impaired breathing likely in sensitive groups. Everyone should avoid all outdoor exertion.