U.S. Air Quality

Clear with cirrus

Today has been a clear day with some cirrus at 8 to 11 km. Temperatures were again upper 70s. There was a nearly homogeneous boundary layer at 1km. Hourly PM 2.5 concentrations in the range of 7.6 to 15.2 µg/m³ [AQI Levels: 27-42 (Good)] were recorded at Maryland's Department of the Enviroment Oldtown site in Baltimore during ELF's operation. The two plots are of the same period of time except the one on the left goes to a higher altitude to show the cirrus and the one on the right is an extinction plot that shows the low concentrations of aerosols at the lower altitudes.

Posted by Paul Schou at July 20, 2007 11:38 PM