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.

DRAFT 6-29-05

1 OTAG Final Report; Ozone Transport Assessment Group, 1997.

2 An Assessment of Tropospheric Ozone Pollution - A North American Perspective; NARSTO, July 2000.

3 Finding 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.

4 Control of Air Pollution From New Motor Vehicles: Tier 2 Motor Vehicle Emissions Standards and

Gasoline Sulfur Control Requirements; Final Rule; USEPA, February 2000.

5 Control of Emissions of Air Pollution from 2004 and Later Model Year Heavy-duty Highway Engines and

Vehicles; Final Rule; USEPA, October 2000.

6 Control 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

Overwhelming Transport

1.0 Introduction

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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