Figure 8. Scatterplot of daily average PM2.5 concentrations (:g m-3) from continental U.S. monitoring
stations for the period January 4-February 19, 2002 versus comparable CMAQ model estimates. Results
are color-coded according to eastern or western U.S. Solid lines are 1:1 as well as 2:1 and 1:2.
Figure 9. Daily maximum modeled ozone concentrations (ppm) with modified VOC emissions data.
Figure 10. Scatter diagram comparing CAMS and modeled ozone concentrations (ppb) with modified
VOC emissions data.
Figure 11. Time series of CAMS and modeled ozone concentrations (ppb) with modified VOC emissions
data for non-industrial sites.
1OTAG Final Report; Ozone Transport Assessment Group, 1997.
2An Assessment of Tropospheric Ozone Pollution - A North American Perspective; NARSTO, July 2000.
3Finding of Significant Contribution and Rulemaking for Certain States in the Ozone Transport
Assessment Group Region for Purposes of Reducing Regional Transport of Ozone; Rule; USEPA, October 1998.
4Control of Air Pollution From New Motor Vehicles: Tier 2 Motor Vehicle Emissions Standards and
Gasoline Sulfur Control Requirements; Final Rule; USEPA, February 2000.
5Control of Emissions of Air Pollution from 2004 and Later Model Year Heavy-duty Highway Engines and
Vehicles; Final Rule; USEPA, October 2000.
6Control of Emissions of Air Pollution From Nonroad Diesel Engines and Fuel; Final Rule, USEPA, May
Criteria For Assessing Whether an Ozone Nonattainment Area is Affected by
Section 172(a)(1) of the Clean Air Act provides that EPA has the discretion to classify
ozone nonattainment areas that are not subject to other classification provisions of the Act (e.g.,
section 182(a)(1)). In the Final Rule to Implement the 8-hour Ozone National Ambient Air
Quality Standard (NAAQS) - Phase 1 (Phase 1 Rule), EPA provided that it would not classify
subpart 1 areas, with one exception. EPA created an overwhelming transport classification for
rural nonattainment areas that are not subject to classification under subpart 2 (i.e., subpart 1
ozone areas) and whose ozone problem is the result of transport of ozone and ozone precursors.
We limited the availability of the classification to certain rural areas that demonstrate that
transport of ozone and/or precursors into the area is so overwhelming that the contribution of
local emissions to observed 8-hour ozone concentration above the level of the NAAQS is
relatively minor and that emissions within the area do not significantly contribute to ozone
concentrations measured in other areas (40 CFR 51.904).
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