The EPA’s Air Quality Modeling Group (AQMG) provides guidance documents to EPA Regional, State, and Tribal air quality management authorities and the general public on how to prepare attainment demonstrations for National Ambient Air Quality Standards (NAAQS) and the Regional Haze Rule using air quality modeling and other relevant technical analyses. These guidance documents are primarily directed at modeling applications in nonattainment areas but are also useful for modeling in maintenance areas or to support other rules or sections of the Clean Air Act. These guidance documents recommend procedures for estimating if a control strategy to reduce pollutant emissions (e.g., ozone precursors) will lead to attainment of the appropriate NAAQS. They also describe how to apply air quality models to generate the predictions later used to see if attainment is shown. This section of guidance is divided into three components: 8-hour Ozone/Particulate Matter (PM2.5)/Regional Haze Guidance, PM10 Guidance, and Carbon Monoxide Guidance.
| Supporting Documents - Ozone/PM2.5/Regional Haze |
Draft Criteria For Assessing Whether an Ozone Nonattainment Area is Affected by Overwhelming Transport (30KB,pdf) and Errata Sheet for Draft Criteria: March 28, 2006 (10KB,pdf).
Frequently Asked Questions on Implementing the DRAFT 8-Hour Ozone Modeling Guidance to Support Attainment Demonstrations for Early Action Compact (EAC). (29.4KB,pdf) (Updated:2/23/04)
Guidance for the 1-hour Ozone Nonattainment Areas that Rely on Weight-of-Evidence for Attainment Demonstrations (65.8KB,pdf) - Mid-Course Review Guidance (4/4/02)
Guidance for Improving Weight-of-Evidence Through Identification of Additional Emission Reduction Not Modeled (56KB,WPD) (Nov 99)
Guidance on Use of Modeled Results to Demonstrate Attainment of 1-hr Ozone NAAQS (637KB,ZIP) (Jun 96)
Guideline for Regulatory Application of the Urban Airshed Model (127KB,pdf) (Jul 91)
Note: Information on air quality modeling of individual sources for visibility assessments can be found at:
Phase I Guidance
Phase II Guidance
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Irwin, J.S., (1998): Interagency Workgroup on Air Quality Modeling (IWAQM) Phase 2 Summary Report and Recommendations for Modeling Long Range Transport Impacts. EPA-454/R-98-019, Office of Air Quality Planning and Standards, Research Triangle Park, NC, 151 pp. (NTIS Accession Number PB 99-121089).
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Garrison, M., A. Gray, S.T. Rao, M. Scruggs (1999): Peer Review of the Interagency Workgroup On Air Quality Modeling Phase 2 Summary Report And Recommendations For Modeling Long Range Transport Impacts. This Report was Compiled by: John S. Irwin Air Policy Support Branch, Atmospheric Sciences Modeling Division U.S. Environmental Protection Agency Research Triangle Park, NC 27711, 64 pp
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| U.S Environmental Protection Agency (1999): Response To Peer Review Comments of the Interagency Workgroup On Air Quality Modeling Phase 2 Summary Report And Recommendations For Modeling Long Range Transport Impacts. 4 pages. |
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