Very thick #wildfire #smoke (dark red) extends over #GreatLakes, #MidAtlantic, #Northeast #US this morning 20 Jul, shown by #GOES16 #ABI AOD composite (L); #smoke degrading surface #AirQuality (R), esp in #OH, #PA, #NY (red/orange dots).@ryans_wx @wildfiretoday @NOAASatellites pic.twitter.com/RDM37Fbia2

— AerosolWatch (@AerosolWatch) July 20, 2021