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. There are a large amounts of fires in the Mississippi Valley region, which are emitting smoke throughout the entire southeast portion of the country. As in the previous posts, you can still see that Siberian smoke plume smeared across the the upper left portion of the image, from Alaska down close to the Great Lakes region. Plumes are stretching across the Gulf of Mexico as well from U.S. fires. The second image below shows the AQI forecast for the country. There are moderate and USG values in the most of the states across the Mississippi Valley and the Plains States. You can barely see it, but San Bernardino, CA, is a code red for today. Although some of these locations correspond to fire and smoke plumes, most of these increased values are due to urban ozone. High temperatures (California and Texas were both averaging over 100 degrees F) and little or no clouds (CA and TX were mostly < 10% covered) maintains higher ozone in these regions.
The first image below shows the MODIS AOD retrieval using the LANCE Web Mapping Service Interface. The increase in AOD across the same regions is apparent in this image. The "glow" in the Gulf of Mexico is merely sun-glint, and not an aerosol. The MODIS retrieval is not validated in this region, so you will not get any product in the sun-glint region. The second animation, courtesy GASP EAST, shows the AOD across the country for today. The AOD increase in this image is due mostly to the smoke and fires in the same regions as described above.