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Guidance for Implementing New SO2 Standard: Effective Strategies and Designation Processes

This memo outlines the U.S. Environmental Protection Agency's revised 1-hour sulfur dioxide (SO2) standards adopted on June 2, 2010. It details the transition from annual and 24-hour standards to a 1-hour standard set at 75 parts per billion (ppb). The document describes the hybrid approach for implementation, emphasizing air dispersion modeling and ambient monitoring to ensure compliance. It also introduces designation categories, factors for identifying nonattainment areas, and provides guidance on modeling and establishing boundaries for SO2 sources.

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Guidance for Implementing New SO2 Standard: Effective Strategies and Designation Processes

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  1. SO2 Designation Guidance Ian D. Cohen EPA Region 1 617-918-1655 U.S. Environmental Protection Agency

  2. Revision to SO2 Standard –Adopted June 2, 2010 EPA replaced the existing annual and 24-hour primary SO2 standards with a new 1-hour SO2 standard set at 75 parts per billion (ppb). EPA also described our planned hybrid approach for implementing the new 1-hour SO2 standard. The approach would rely on air dispersion modeling of SO2 sources and ambient monitoring to determine compliance with the new standard.

  3. Structure of the Memo • Body of Memo: What is a Nonattainment Area? • Attachment 1: Schedule • Attachment 2: Factors to be used in specifying a nonattainment area • Attachment 3: Modeling guidance U.S. Environmental Protection Agency

  4. SO2 Implementation Schedule * See www.epa.gov/nsr/documents/20100823guidance.pdf ** See www.epa.gov/air/sulfurdioxide/pdfs/20110324so2designationsguidance.pdf

  5. Designation Guidance for SO2 NAAQS • Modeling and boundary guidance to support initial designations released to states/tribes on March 24, 2011. • Designations driven by modeling rather than monitoring. • States given option to be initially designated as attainment if modeling results support an attainment designation. • No unclassifiable/attainment but rather: attainment, nonattainment, unclassifiable. U.S. Environmental Protection Agency

  6. SO2 Designations Categories

  7. Identifying Nonattainment Areas • Identify through monitoring and modeling appropriate areas violating the NAAQS • Approx. 59 counties will be designated as “nonattainment.” • Determining Boundaries • Should contain areas violating NAAQS, as well as nearby areas which contain sources U.S. Environmental Protection Agency

  8. Nonattainment Area Boundaries • First approximation: County • Adjusted by other factors, including • Air quality data • Emissions-related data • Meteorology • Geography/topography • Jurisdictional boundaries U.S. Environmental Protection Agency

  9. Where SO2 differs from all other NAAQS designations • States are not required to model for initial designation purposes. • Thus, we expect most of country to be designated “unclassifiable.” • Unclassifiable areas have substantial sec. 110(a)(1) SIP requirements, unlike other NAAQS with same designation. • Must submit by June 3, 2013, a SIP demonstrating an adequate program to implement, maintain, and enforce the SO2 NAAQS

  10. Modeling Guidance • Model Selection • Domain/Sources • Receptor Grid • Allowables/Actuals • Stack Height • Configuration • Urban/Rural • Source Groups • NWS Met Data • Site Specific Data • Background • Design Values U.S. Environmental Protection Agency

  11. Link to SO2 Guidance: Guidance can also be accessed from TTN SCRAM Bulletin Board and from the Sulfur Dioxide Webpage http://www.epa.gov/air/sulfurdioxide/pdfs/20110324so2designationsguidance.pdf U.S. Environmental Protection Agency

  12. Questions U.S. Environmental Protection Agency

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