Designations for the 2006 PM2.5 Standards: Evaluating the Nine Factors in Setting Nonattainment Area Boundaries Part 1 – Overview. Rich Damberg, Tom Rosendahl EPA Office of Air Quality Planning and Standards June 21, 2007. Statutory Requirement.
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Rich Damberg, Tom Rosendahl
EPA Office of Air Quality Planning and Standards
June 21, 2007
“…any area that does not meet (or that contributes to ambient air quality in a nearby area that does not meet) the national primary or secondary ambient air quality standard for the pollutant.”
Nearby Sources and Transported Emissions
2003-2005 versus Preliminary 2004-2006 PM2.5 24-hour NAAQS Status:
PM2.5 Nonattainment Areas (NAA) and Additional Violating Sites
4 NAA (yellow) and 21 sites (yellow) outside of NAA violated the revised 24-hr NAAQS in 2003-2005 but did not violate it with 2004-2006 data. In some cases this is because the 2004-2006 data is incomplete for the previously violating sites. Several of these incomplete sites have been closed.
Data from AQS 4/7/2007
Population 1.7 million
Shoshone County, Idaho – City of Pinehurst
Population 1.5 million
Satellite imagery can help
illustrate the degree of
urbanization and can help
identify important emissions
sources in the vicinity of the
Milwaukee-Racine-Waukesha, WI CBSA
Percentage of workers who commute to other counties in the metro area
Source: 2000 US Census, Journey to Work data
Kinda flat …
Topography is not
much of an issue here.
- Example: Libby, Montana
in large county
Numbers represent tons of emissions of PM2.5, SO2, NOx, VOC