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Event Evidence Analysis
For the Chesterfield site (450250001) chemical composition data for March 6, 2002 are not available. The surrounding stations in the southeastern U.S. do not indicate a regional scale SmokeBioMass episode. The NAAPS model SO4 surface concentration estimate shows the highest values north of the Ohio River Valley.
Fire and Transport:
The satellite data indicate isolated fire pixels over the southeastern U.S. The satellite Aerosol Optical Thickness, AOT, also shows isolated small plumes, 5-10 km width oriented from the southwest to the southeast.
The fine mass concentration shows that Chesterfield, SC (near Charlotte, NC) has exceptionally high PM2.5 (41 mg/m3) compared to the surrounding stations (<15 mg/m3).
The time series for Chesterfield indicate that March 6, 2002 shows exceptionally high PM2.5 concentration (41 mg/m3) compared to other times, prior and after the event.
The high PM2.5 concentration at Chesterfield on March 6, 2002 is an anomaly in both spatial and temporal pattern which is consistent with the impact from a nearby smoke source. This exceptional value is supported by the satellite AOT which indicate small plumes originating from nearby fires.