October 17, 2007
Moderate AQI Levels
The boundary layer rose up to 1.3 km between 14:30-18:00 UTC. A residual layer from yesterday's boundary layer was observed during the first 2.5 hours of today's timeseries. A layer aloft that extended from 1.5-2.5 km advected over ELF. Hourly PM 2.5 concentrations in the range of 18.7 to 31.4 (Moderate AQI Levels: 57-82) ug/m3 were recorded at Maryland's Department of the Enviroment Oldtown site in Baltimore during ELF's operation.