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State Implementation Plan (SIP) Attainment Demonstration Guidance

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.


8-hour Ozone/PM2.5/Regional Haze Modeling Guidance

Guidance on the Use of Models and Other Analyses for Demonstrating Attainment of Air Quality Goals for Ozone, PM2.5, and Regional Haze. (1,072KB,pdf) - Final version of the Ozone, PM2.5, and Regional Haze modeling guidance document.

Update to the 24 Hour PM2.5 NAAQS Modeled Attainment Test (385 KB, pdf) - Updated version of the 24-hour PM2.5 attainment test. This new version replaces section 5.2 of the 2007 PM2.5 modeling guidance.

NOTE: The final 8-hour ozone guidance ("Guidance on the Use of Models and Other Analyses in Attainment Demonstrations for the 8-hour Ozone NAAQS") has been incorporated into the multi-pollutant guidance document above. The standalone guidance document has been removed.

The Modeled Attainment Test Software (MATS) Tool is now available.


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

National Park Service (1993): Interagency Workgroup on Air Quality Modeling (IWAQM) Phase 1 Report: Interim Recommendation For Modeling Long Range Transport And Impacts On Regional Visibility. EPA-454/R-93-015, U.S. Environmental Protection Agency, Technical Support Division, Research Triangle Park, North Carolina 27711, 105 pp.

U.S. Environmental Protection Agency (1995): Interagency Workgroup on Air Quality Modeling (IWAQM): Assessment of Phase 1 Recommendations Regarding the Use of MESOPUFF II. EPA-454/R-95-006. Office of Air Quality Planning and Standards, U.S Environmental Protection Agency, Research Triangle Park, NC 27711, 137 pp.
   Phase II Guidance

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).

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.

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 pp.

U.S. Environmental Protection Agency (2009): Reassessment of the Interagency Workgroup on Air Quality Modeling (IWAQM) Phase 2 Summary Report: Revisions to Phase 2 Recommendations. Draft Document, 56 pp.

U.S. Environmental Protection Agency (2012): Documentation of the Evaluation of CALPUFF and Other Long Range Transport Models using Tracer Field Experiment Data. EPA Contract No: EP-D-07-102, Work Assignment No: 4-06. 247 pp.



PM10 Guidance

Fugitive Dust Guidelines (692KB,ZIP) - Guidance for modeling fugitive dust: Phase I, II & III (12/9/96)


Carbon Monoxide Guidance

Guideline for Modeling Carbon Monoxide from Roadway Intersections (532,pdf) - Applicable for roadway intersections (7/19/93)


 

Office of Air and Radiation | Office of Air Quality Planning and Standards


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