22 Solomon, P.A., P.K. Hopke, J. Froines, and R. Scheffe, 2008: Key Scientific and Policy and Health-Relevant

Findings from the U.S. EPA’s Particulate Matter Supersites Program and Related Studies: An Integration and

Synthesis of Results, J. Air & Waste Manage. Assoc., 58, S-1 – S-92.

Public Review Draft 03/04/2013

A-4

Figure A-2. National Average of Source Contribution 1 to Fine Particle Levels

2

Source: The Particulate Matter Report, USEPA 454-R-04-002, Fall 2004. Carbon reflects both organic carbon and

4 elemental carbon. Organic carbon accounts for automobiles, biogenics, gas-powered off-road, and wildfires.

5 Elemental carbon is mainly from diesel powered sources.

6

7

 

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