October 8, 2007
Hot and Hazy
Haze skies prevailed during today's observations, as the Mid-Atlantic region experienced temperature's in the 90's. A residual layer (1-1.5 km) was observed during the first two hours of observations. This layer mixes with the rising boundary layer by 17:00 UTC. A rising boundary layer can be observed, reaching up to 2 km at 19:00 UTC. Hourly PM 2.5 concentrations in the range of 23.8 to 31.1 ug/m3 [AQI Levels: 67-82 (Moderate)] were recorded at Maryland's Department of the Enviroment Oldtown site in Baltimore during ELF's operation.