What a difference a few weeks makes. Today, ozone was in the green AQI levels all over the US except for a small area in the eastern San Joaquin Valley in California. Aerosols were in the moderate range in Southern California and in isolated areas across the country. In the South, rain, rain, and more rain has been the norm as Tropical Storm Humberto and Ingrid combined over Texas and were swept eastward to the Atlantic States. In Houston, the graph below shows that nearly 3" of rain fell across the region. While DISCOVER-AQ waits for clearer air (shown by the GOES Water Vapor loop , right), we are watching a lot of football.
Update: September 22, 2013 18:00 CDT
We look like we moved into Fall from an air quality perspective as well. Ozone is in the green AQI levels all across the US. PM reaches the moderate levels only in California. So much rain has fallen in the southeastern US, there are almost no noticeable fires in the US. Remember that big Rim Fire in California, now the region is covered again... with snow instead of smoke.
The GASP AOD product is now showing its pecular behavior that happens every fall. Remember that GASP looks at the differences between the radiance seen in a broad visible band today and in the darkest pixel over the last 28 days. When the ground starts to become bare or the trees start changing their color to red, the surface radiance now is larger than it was when the ground was green in August. So it looks like there is aerosol aloft. In the GASP loop below, you can tell this is an artifact of reflectivity because the "AOD" does not have any motion.