The Variability of 24-Hour Average Background PM
As an example of available data, we have characterized background particulate matter using data from 14 IMPROVE network sites.
For the IMPROVE sites, we have characterized
- annual mean PM10, PM2.5, and PM10-2.5;
- annual mean PM2.5 sulfate and nitrate concentrations;
- annual mean PM2.5 elemental carbon and organic carbon
- percentile distribution of the 24-hour concentrations by year for PM2.5, PM10,and PM10-2.5; and
- percentile distribution of the 24-hour concentrations by quarter for PM2.5.