8 In addition, ammonia from sources such as fertilizer and animal feed operations

9 contributes to the formation of sulfates and nitrates that exist in the atmosphere as ammonium

10 sulfate and ammonium nitrate. Note that fine particles can be transported long distances by wind

11 and weather and can be found in the air thousands of miles from where they were formed.

12

13 The chemical makeup of particles varies across the United States (as shown in Figure A-

14 3).23 For example, fine particles in the eastern half of the United States contain more sulfates

15 than those in the West, while fine particles in southern California contain more nitrates than

16 other areas of the country. Organic carbon is a substantial component of fine particle mass

17 everywhere. This figure represents the composition of PM2.5 as measured by the PM2.5 FRM.24

 

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