September 18, 2007
clear day
It was even clearer today than yesterday. The aloft layer, which was present yesterday, was gone. The hourly PM 2.5 concentrations in the range of 6.6 to 9.2 ug/m3 were recorded at the Oldtown site during ELF’s operation. The aerosol optical depth was ~0.08 from the AERONET site, MD Science Center.
