Air Quality Alert issued June 25 at 10:36AM CDT by NWS

...AIR QUALITY ALERT IN EFFECT UNTIL MIDNIGHT CDT TONIGHT... THE ILLINOIS ENVIRONMENTAL PROTECTION AGENCY HAS DETERMINED THAT AN AIR POLLUTION ACTION DAY WILL BE DECLARED FOR THE GREATER CHICAGO METROPOLITAN AREA AND IS IN EFFECT UNTIL MIDNIGHT CDT TONIGHT. AN AIR POLLUTION ACTION DAY IS DECLARED WHEN WEATHER CONDITIONS ARE SUCH THAT WIDESPREAD OZONE AND OR PARTICULATE LEVELS ARE EXPECTED TO

from Current Watches, Warnings and Advisories for the United States Issued by the National Weather Service http://ift.tt/28TdQgf