Abstract
In 2004 and 2005, the East Tennessee Ozone Study (ETOS) enhanced its regional measurement program with annular denuder systems to quantify sulfur dioxide (SO 2) and PM 2.5 sulfate (SO 4 2−) at five sampling sites that were representative of the complex terrain and physiographic features of East Tennessee. Intersite spatial variability was more defined for SO 2 than for SO 4 2−, which showed a fairly uniform structure in both daytime and nighttime measurements. Pollution roses indicated that two sites may have been influenced by the proximity of SO 2 emission sources. The data suggest that SO 2 is affected by nearby sources in the study area while the sources of SO 4 2− are regionally distributed.
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