July 12, 2007
Clear day
It is very clear today with low clouds on top the boundary layer in the afternoon. The boundary layer rises from 1km(in the early morning) to 2.5km(in the late afternoon). The aerosol optical depth is around 0.05 from AERONET, MD science center. The hourly PM 2.5 concentrations in the range of 3.6 (13:00, July 12nd, 2007, UTC) to12 ug/m3(21:00, July 12nd, 2007, UTC) were recorded at Maryland's Department of the Environment Oldtown site in Baltimore during ELF's operation.
