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Technology Transfer Network - OAR Policy and Guidance

Information on Rules for Reducing Regional Transport of Ground-Level Ozone (Smog)

The Environmental Protection Agency (EPA) is proposing to require 22 states and the District of Columbia to submit state implementation plans that address the regional transport of ground-level ozone, the main component of smog. By improving air quality and reducing emissions of nitrogen oxides (a precursor to ozone formation known as NOx), the actions directed by these plans will decrease the transport of ozone across State boundaries in the eastern half of the United States. The States that will be subject to this action are:

Alabama, Connecticut, District of Columbia, Delaware, Georgia, Illinois, Indiana, Kentucky, Massachusetts, Maryland, Michigan, Missouri, North Carolina, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, South Carolina, Tennessee, Virginia, Wisconsin, and West Virginia.

Through a 2-year effort known as the Ozone Transport Assessment Group (OTAG), EPA worked in partnership with the 37 eastern-most States and the District of Columbia, industry representatives, and environmental groups to address ozone transport. Since May 1995, OTAG has been meeting to identify and evaluate flexible and cost-effective strategies for reducing long-range transport of ozone and ozone precursors.

States that participated in OTAG but are not subject to the requirements of this action are:

Arkansas, Florida, Iowa, Kansas, Louisiana, Maine, Minnesota, Mississippi, North Dakota, Nebraska, New Hampshire, Oklahoma, South Dakota, Texas, Vermont

The proposed rule does not mandate which sources must reduce pollution. States will have the ability to meet the requirements of this rule by reducing emissions from the sources they choose. However, utilities and large non-utility point sources would be one of the most likely sources of NOx emissions reductions.

Sources of More Detailed Information follow:


From the listing below, find the file you would like to download. The available file formats are represented by icons on the right side of the listing. Click on the icon that represents the file format you wish to receive. For an explanation of file formats and their icons, see our TTNWeb File Types.

File Description File Date File Types
NOx SIP Call Checklist 5-6-99 PDF file
Technical Amendment to the Finding of Significant Contribution and Rulemaking for Certain States for Purposes of Reducing Regional Transport of Ozone 5-6-99 PDF file
Responses to the 2007 Baseline Sub-Inventory Information and Significant Comments for the Final NOx SIP Call 5-6-99 PDF file
Development of Emission Budget Inventories for Regional Transport NOx SIP Call 5-6-99 PDF file
NOx SIP Call Questions and Answers - Volume 1 1-27-99 PDF file
Reopening of Emissions Inventory Comment Periods for the Findings of Significant Contribution and Rulemakings on Section 126 Petitions and Federal Implementation Plans for Purposes of Reducing Interstate Transport of Ozone--FR Notice 1-15-99 PDF file
Reopening of Emissions Inventory Comment Periods for the Findings of Significant Contribution and Rulemakings on Section 126 Petitions and Federal Implementation Plans for Purposes of Reducing Interstate Transport of Ozone--Fact Sheet 1-15-99 PDF file
NOx SIP call RIA Volume 2 (FIP & Section 126) 1-13-99 zip file
Updated NOx Allowance Allocations and General Unit-specific Information for Affected Utility Sources Under the Proposed Section 126 and Section 110 FIP Rulemakings 12-21-98 zip file
Updated NOx Allowance Allocations and General Unit-specific Information for Affected Non-utility Sources Under the Proposed Section 126 and Section 110 FIP Rulemakings 12-21-98 xls file
NOTE: This is a revised correction and clarification FR for the 110 NOx SIP call. This replaces the 12/1/98 correction notice. EPA had to separate this correction for 110 from the reopening of the comment period for the specific emission inventory revisions for 126 and the FIP since those are proposal actions. Shortly, EPA will publish a reopening of the comment period for emission inventory revisions notice for 126 and the FIP. 12-16-98 PDF file
Correction Notice and Reopening of Emissions Inventory Comment Period for EPA's Final Rule Requiring Regional NOx Reductions in the Eastern U.S.--Fact Sheet 12-16-98 PDF file
Transcript of Public Hearing Held 10/28/98 in Washington, DC on the 126 Petitions and Federal Implementation Plans 11-24-98 PDF file
Extension of Comment Period on Emission Inventory Inputs 11-16-98 html file
FR version of the 110 NOx SIP call -- Parts 1-4 (zipped) 10-30-98 zip file
FR version of the 110 NOx SIP call -- Part 1 10-30-98 PDF file
FR version of the 110 NOx SIP call -- Part 2 10-30-98 PDF file
FR version of the 110 NOx SIP call -- Part 3 10-30-98 PDF file
FR version of the 110 NOx SIP call -- Part 4 10-30-98 PDF file
NOx SIP call RIA Volume 1 (Costs and Economic Impacts) 10-9-98 zip file
NOx SIP call RIA Volume 2 (FIP & Section 126) 1-13-98 zip file
Errata #2 for final response to comments document for the ozone transport rulemaking (NOx SIP Call) 10-9-98 PDF file
Budget Inventory Information and Location 10-7-98 txt file
TSD on Development of Modeling Inventory and Budgets for Regional NOx SIP Call 10-1-98 PDF file
Final response to comments document for the ozone transport rulemaking (NOx SIP Call) 9-30-98 PDF file
Errata for final response to comments document for the ozone transport rulemaking (NOx SIP Call) 9-30-98 PDF file
Fact Sheet -- Final Rule for Reducing Regional Transport of Ground-Level Ozone, Proposed Federal Implementation Plan, and Proposal Related to Section 126 Petitions 9-24-98 PDF file
Finding of Significant Contribution and Rulemaking for Certain States in the Ozone Transport Assessment Group Region for Purposes of Reducing Regional Transport of Ozone 9-24-98 PDF file
Rule Text: Findings and requirements for submission of State implementation plan revisions relating to emissions of oxides of nitrogen 9-24-98 PDF file
Figure II-1. Ozone Transport Assessment Group Subregions(figure that accompanies the preamble text for Finding of Significant Contribution and Rulemaking for Certain States in the Ozone Transport Assessment Group Region for Purposes of Reducing Regional Transport of Ozone) 9-24-98 PDF file
Short Federal Register Notice for Proposed Federal Implementation Plan and Proposed Findings on Section 126 Petitions for Purposes of Reducing Interstate Ozone Transport -- Details about the availability of proposed rule text,request for comment, and public hearing 9-24-98 PDF file
Proposed Federal Implementation Plans to Reduce the Regional Transport of Ozone 9-24-98 PDF file
Proposal -- Findings of Significant Contribution and Rulemaking on Section 126 Petitions for Purposes of Reducing Interstate Ozone Transport 9-24-98 PDF file
Appendix A: NOx Allowance Allocation Tables for Affected Sources Under Section 126 of the Act 9-24-98 PDF file
Appendix B:NOx Allowance Allocation Tables for Affected Sources Under Section 110 of the Act in Georgia,South Carolina, and Wisconsin 9-24-98 PDF file
Appendix F of EPA's Proposed Action on Section 126 Petitions Containing Maps Depicting Areas Covered by Each of the 8 States' Section 126 Petitions 9-24-98 PDF file
Summary of EPA UAM-V Model Runs, EPA CAMx and Model Runs and EPA Analysis of 8-Hour Design Values versus Model Predictions. 8-12-98 PDF file
Official transcript of proceedings of public hearing on proposed supplement to nox sip call 6-22-98 PDF file
List of persons scheduled to give testimony at SIP-call public hearing on 5/29/98 in Washington, DC 5-28-98 PDF file
Signed version of SNPR (04/28/98) 4-29-98 PDF file
Figure for Section 7 of SNPR 4-29-98 PDF file
Tables for Section 7 of SNPR 4-29-98 PDF file
May 29, 1998 Public Hearing information 4-29-98 PDF file
SNPR Fact Sheet 4-29-98 PDF file
Reopening the comment period for certain issues raised in the Proposed Rulemaking for a Finding of Significant Contribution and Rulemaking for Certain States in the Ozone Transport Assessment Group Region for Purposes of Reducing Regional Transport of Ozone. 4-9-98 PDF file
Supplemental Ozone Transport Regulatory Analysis (Zip file contains the Word Perfect files) 4-7-98 PDF file
Technical Support Document on Development of Modeling Inventory And Budgets For The Ozone Transport Sip Call 4-2-98 PDF file
     - Appendix A, List of Daily EGU Inventory 4-2-98 zip file
     - Appendix B, List of Seasonal EGU Inventory 4-2-98 zip file
     - Appendix C, List of Sources Moved From OTAG Utility to Non-EGU Data 4-2-98 zip file
     - Appendix D, List of Large and Medium Non-EGU Sources 4-2-98 zip file
Draft - Seasonal budget components and total budgets revisions that were made to the budgets that were proposed on November 7,1997 3-9-98 xls file
Transcript from Public Hearing on Ozone Transport SIP Call - 2/3/98 2-25-98 PDF file
Transcript from Public Hearing on Ozone Transport SIP Call - 2/4/98 2-25-98 PDF file
Explanation of Revised Budget Calculations 2-3-98 txt file
Draft Appendices for Revised Budget Calculations for Electric Generation Sources 2-3-98 zip file
Draft Appendices for Revised Budget Calculations for Non-electric Generation Point Sources 2-3-98 zip file
Draft Public Hearing on Ozone Transport SIP Call Speaking Schedule 2-2-98 PDF file
FACT SHEET: Notice of Public hearing - Proposed Finding of Significant Contribution and Proposed Rulemaking for Certain States in the Ozone Transport Assessment Group Region for Purposes of Reducing Regional Transport of Ozone 1-7-98 PDF file
Proposed Rule for Reducing Regional Transport of Ozone (Fact Sheet) 10-10-97 PDF file
Proposed Rule for Reducing Regional Transport of Ozone (F.R. Notice)[Editorial Revised F.R. Version (10/24/97] 10-10-97 PDF file
Appendix B - OTAG Recommendations 10-10-97 PDF file
Appendix C Table II-1 - OTAG 2007 State Total NOx Emissions (tons/day) [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-2 - OTAG 2007 State NOx Emissions (tons/day) and Emissions Density (tons/day/1000 sq. mi.) [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-3 - OTAG 2007 Baseline Control Measures [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-4a - OTAG Strategy Control Packets for NOx [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-4b - OTAG Strategy Control Packets for VOC [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-5a - Round 1 and 2 Control Levels by Emissions Sector [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-5b - Domainwide Round 1 and 2 Emission Totals by Sector [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-6 - Round 3 Control Levels by Geographic Zone [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-7 - Round 3 Control Levels by Geographic Zone [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-8a - Counties Violating the 1-Hr Ozone NAAQS Based on 1993-1995 Ambient Air Quality Monitoring Data [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-8b - Counties Violating the 8-Hr Ozone NAAQS Based on 1993-1995 Ambient Air Quality Monitoring Data [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-9a - Summary of Air Quality Contributions to Downwind Nonattainment, for SubRegions 1-6 [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-9b - Summary of Air Quality Contributions to Downwind Nonattainment, for SubRegions 7-12 [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-10 - Number of Impacts in Each "Downwind" State1,2, by Impact Concentration Range for Each SubRegion -- Approach 1: 1-Hr "Violating Counties" [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-11 - Number of Impacts in Each "Downwind" State1,2, by Impact Concentration Range for Each SubRegion -- Approach 2: 1-Hr "All Grid Cells" [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-12 - Number of Impacts in Each "Downwind" State1, by Impact Concentration Range for Each SubRegion -- Approach 3: 8-Hr "Violating Counties" [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-13 - Number of Impacts in Each "Downwind" State1,2, by Impact Concentration Range for Each SubRegion -- Approach 4: 8-Hr "All Grid Cells" [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-14a - Percent of 2007 State Total NOx Emissions by Subregion [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-14b - Percent 2007 Baseline NOx Emissions by Subregion, by State [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix C Table II-15 - Estimate of Local Control Cost Avoided by OTAG Strategy [Reformatted tables for FR version of appendix C] 10-10-97 PDF file
Appendix D Figure II-1 - OTAG Modeling Domain 10-10-97 PDF file
Appendix D Figure II-2 - Location of Subregions 10-10-97 PDF file
Appendix D Figure II-3 - OTAG Round 3 Geographic Zones (shaded areas are 3 "major" nonattainment areas) 10-10-97 PDF file
Appendix D Figure II-4 - Transport Wind Vectors During Regionally High Ozone Days 10-10-97 PDF file
Appendix E - Control Strategies Contained in Model Run 5 of the Ozone Transport Assessment Group 10-10-97 PDF file
Calculation of Budget Components Technical Support Document [Revised Version] 10-27-97 PDF file
Technical Support Document Appendix A - Unit-Specific Electric Generation Data (Utility-Owned Units) 10-14-97 wk4 file
Technical Support Document Appendix B - Unit-Specific Electric Generation Data (Non Utility-Owned Units) 10-14-97 wk4 file
Technical Support Document Appendix C - List of Large Non-Utility Point Sources 10-14-97 wk4 file

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