There was that really strange pollution warning that someone posted a while back. There were particulates in the air, and a big swath of area (weird for air pollution that's normally in cities, like Chicago). People were warned to stay indoors.
I wonder if it's related.
Air quality alert issued for NE Illinois, NW Indiana
February 4, 2010 4:04 AM
The alert was called because of anticipated high levels of fine particulate matter in the air, according to the IEPA.
http://www.chicagobreakingnews.com/2...w-indiana.html
That warning was for 4 states around Lake Michigan.