Spatial and Temporal Trends in PM2.5 Organic and Elemental Carbon across the United States
Figure 4
IMPROVE and CSN 2007–2010 seasonal mean PM2.5 elemental carbon (EC) percent of reconstructed fine mass (RCFM) for (a) winter (DJF), (b) spring (MAM), (c) summer (JJA), and (d) fall (SON). IMPROVE sites are shown as circles, and CSN sites are shown as triangles.
