U.S. Air Quality

Haze and Moderate PM2.5

Hazy skies prevailed today over Baltimore. The boundary layer rose up to 3km during today's observations. The residual layer mixed with today's boundary layer during the first 4 hours of operation (aerosol aloft from heights above 0.5 km up to 3 km). The PM2.5 concentrations at Maryland Department of the Environment Oldtown monitoring station ranged between 15-27 ug/m3 (Good-Moderate AQI Levels: 49-74) due to a cleaner northwestern airmass that advected over Baltimore.