According to the July 6 OMI map, fires in western Canada generated large amount of smoke that is advected toward the Midwest. As seen on the OMI map below, the aerosol index is between 1 and 1.5 just west of the Great Lakes. Here is another view of the smoke over the Great Lakes (MODIS Rapidfire).
http://alg.umbc.edu/usaq/archives/001735.html
http://rapidfire.sci.gsfc.nasa.gov/realtime/single.php?T061871605
Posted by Dave at July 7, 2006 10:57 AM