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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.
| 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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