Updating yesterday’s post, it appears that the fire smoke from the large group of fires in western and central Canada is continuing to work its way into the eastern US and will impact the mid-Atlantic region in the next few days.

Yesterday’s polar orbiter images via MODIS shows the extent of the smoke:

This morning’s PM2.5 surface observation show high concentration in KY and beginning to increase at the high elevation monitor at Big Meadows, VA in Shenadoah NP.

Figure 1.  PM2.5 hourly concentrations at Big Meadows, and two monitors in KY, July 1.  Data courtesy of EPA AirNow.