19In the East, regional pollution contributes more than half of total PM2.5 concentrations.
20Rural background PM2.5 concentrations are high in the East and are somewhat uniform over large
21geographic areas. These regional concentrations come from emission sources such as power
22plants, natural sources, and urban pollution and can be transported hundreds of miles. The local
23and regional contributions for the major chemical components that make up urban PM2.5:
24sulfates, carbon, and nitrates.
25Information regarding the IMPROVE monitoring network can be found at the following website:
26Hand 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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