Looking at the NOAA HMS Smoke and Fire Product (top left), the clumps of small red dots indicate masses of currently burning fires, with smoke plumes being indicated by the grey patches. The Great Slave and Bear Lake fires have created a large plume spanning into the Mid-Atlantic, with the heaviest smoke being in the Northeast portions of both Canada and the United States. The MODIS Aqua image (top right) illustrates clearly elevated AODs in the path of this plume, with the highest AODs corresponding to the high density areas of smoke. The HMS also picked up multiple plumes over the Central US stemming from the Nevada and Utah wildfires as mentioned yesterday by Daniel.
The EPA AIRNow combined AQI loop (bottom left) shows elevated AQIs in Utah and the Northeast, which could be a result of the smoke plumes. For the moderate AQIs in the Southeast, the main component was PM2.5, and the NAAPS Sulfate Model (bottom right) predicted elevated sulfate levels at 1800 UTC, which could explain the increased PM2.5 concentrations.