Looking at the NOAA HMS Smoke and Fire Product (left), the grey areas denote smoke plumes over the Mississippi River Valley, Ohio River Valley, Mid-Atlantic, and even Minnesota. The largest plume is composed of remaining smoke from earlier Canadian fires in the Northeast and agricultural fires in the Mississippi and Ohio River Valleys. These areas correspond to the regions of higher AOD, as seen in the GASP EAST animation (right). This plume is very thin, but the HMS Smoke and Fire Product shows active fires with red dots, many of these coming from the Midwest and lower Mississippi River Valley. As these agricultural fires continue to burn, expect to still see some thin smoke traveling east tomorrow.
The animation below, courtesy EPA AIRNow, shows the combined ozone and PM2.5 AQI for today. Moderate AQIs spanned much of the eastern half of the United States, and with the mixture of smoke and high temperatures, several places such as Millville, NJ (158), Philadelphia, PA (158), and Danbury, CT (151) reached unhealthy AQI levels. The highest AQI today, however, occurred in Tulomne City, CA with 221. This is most likely an effect of the remaining Rim fire, which continues to be 80% contained. The expected containment date, according to USDA Forest Service Active, is September 20.