We recently came across the ‘Smog Blog’ maintained by the Atmospheric Lidar Group of the University of Maryland – Baltimore County/NASA Goddard Space Flight Center Joint Center for Earth Systems Technology . They make frequent posts on current U.S. Air Quality, usually incorporating cool graphics from NASA or NOAA satellites, National Parks Service webcam images, or air quality model results. Check it out!
UMBC U.S. Air Quality: The Smog Blog