March 1, 2007
Hazy Day
Today is hazier than yesterday, with hourly PM 2.5 concentrations in the range of 13.7 to 24.3 ug/m3 were recorded at Maryland's Department of the Enviroment Oldtown site in Baltimore during ELF's operation. The boundary layer rose up to 750 m and the aloft layers can be observed at around up to 4.5 km. There were clouds throughout the run, decreasing from 10km to 5km, which may have contributed to the lower boundary layer height and higher PM 2.5.
