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. Author manuscript; available in PMC: 2014 Jan 13.
Published in final edited form as: Atmos Chem Phys. 2013 Aug 1;13(15):7361–7379. doi: 10.5194/acp-13-7361-2013

Fig. 6.

Fig. 6

Average monthly PM2.5 constituent mass concentrations at six EPA IMPROVE sites. Shaded regions represent when maxima are observed for individual or groups of sites. These results are based on data ranges shown in Table 1 for each site.