42 U.S. EPA, 2012d: Summary of Public Comments, 10th Conference on Air Quality Modeling.

43 U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, 27711.

44 http://www.epa.gov/ttn/scram/10thmodconf/10thMC_Summary_of_Comments-

45 Revised_10-05-2012.pdf

46

Public Review Draft 03/04/2013

A-1

Appendix A: The Scope and Magnitude 1 of the PM2.5 Air Quality Problem

2

3 This appendix provides a brief summary of the current PM2.5 monitoring networks and

4 characterizes PM air quality in terms of its chemical composition, concentration levels, and

5 spatial and temporal patterns across the nation based largely on ambient data and analyses

6 contained in the EPA’s The Particle Pollution Report,20 Particulate Matter Staff Paper,21 and new

7 ambient data summaries based on 2008-2010 PM2.5 mass and speciation data. It also discusses

8 regional and local source contributions to urban PM2.5 concentrations.

9

10 1. PM2.5 Monitoring Networks

 

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