19 In the East, regional pollution contributes more than half of total PM2.5 concentrations.

20 Rural background PM2.5 concentrations are high in the East and are somewhat uniform over large

21 geographic areas. These regional concentrations come from emission sources such as power

22 plants, natural sources, and urban pollution and can be transported hundreds of miles. The local

23 and regional contributions for the major chemical components that make up urban PM2.5:

24 sulfates, carbon, and nitrates.

25 Information regarding the IMPROVE monitoring network can be found at the following website:

http://vista.cira.colostate.edu/improve

26 Hand et. al., Spatial and Seasonal Patterns and Temporal Variability of Haze and its Constituents in the United

States: Report V, 2011 (http://vista.cira.colostate.edu/improve/Publications/Reports/2011/2011.htm)

 

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