The first image below, courtesy NOAA HMS, shows the fire locations across the United States. The red dots correspond to active fires, and the grey areas are plumes. The major concentration of fires in the southeast and Mississippi valley regions. Although there is a large concentration of fires, there is not much smoke being picked up by HMS. Some of this smoke may have subsided from the recent precipitation. The second image below, courtesy of MODIS Terra, shows the retrieved AOD for the country today. You can see that most of these raised values correspond to more optically thick areas, which correspond to the fires and smoke debris throughout the nation. Specifically, the large concentration of smoke from the Mississippi Valley fires are increasing the AOD. The Carolinas also appear to have an increase in AOD that is most likely due to smoke from fires southwest of the states.
The first image, courtesy EPA AIRNOW, shows the San Fernando valley for the day. Many of these code oranges and yellows were due to PM 2.5. The next image, courtesy GEOS-5, shows the modeled sulfate only AOD [550 nm] for the eastern half of the country today. These model results show that there has been an increase in sulfate concentrations in the Mid Atlantic region, which may be causing additional code oranges/yellows.