October 30, 2007
Clear day
It was very clear today with a high pressure system over Baltimore. The hourly PM 2.5 concentrations in the range of 9.2 to 16.6 ug/m3 were recorded at the Oldtown site during ELF’s operation, which increased a little from yesterday. The aerosol optical depth was ~0.1 from the AERONET site, MD Science Center. There were some thin aloft layers at ~1.7 km, which might be smoke from the northwest of UMBC from the HYSPLIT.
