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EPA/AR RIN: 2060-AK60 Publication ID: Spring 2003 
Title: ●Revision to the Guideline on Air Quality Models (Appendix W to 40 CFR Part 51): Adoption of a Preferred General Purpose (Flat and Complex Terrain) Dispersion Model and Other Revisions 
Abstract: This action would revise the Guideline on Air Quality Models, published as appendix W to 40 CFR part 51. The Guideline provides EPA-recommended models for use in predicting ambient concentrations of pollutants for programs ranging from Prevention of Significant Deterioration (PSD) to State Implementation Plans (SIPs) for controlling air pollution sources. The Guideline fulfills a Clean Air Act mandate for EPA to specify models for air management purposes. This revision would enhance the Guideline by incorporating a new, general-purpose dispersion model called AERMOD, which would replace the existing Industrial Source Complex (ISC3) model in many air-quality assessments, including those involving complex terrain. An earlier version of the AERMOD revision was previously proposed (65 FR 21505, 4/21/2000; see SAN 3470), but not promulgated. We are reproposing it to reflect changes made in response to public comment we received on the April 2000 proposal. 
Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 51.112    40 CFR 51.160    40 CFR 51.166    40 CFR 52.21   
Legal Authority: 42 USC 7410    CAAA 110(a)(2)    CAAA 165(e)    CAAA 172(a)    CAAA 172(c)    42 USC 7601    CAAA 301(a)(1)    CAAA 320   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  04/21/2000  65 FR 21505   
Supplemental NPRM  05/00/2003    
Final Action  09/00/2003    
Additional Information: SAN No. 3470
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal, Local, State, Tribal 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
Agency Contact:
Tom Coulter
Environmental Protection Agency
Air and Radiation
D243-01,
Research Triangle Park, NC 27711
Phone:919 541-0832
Email: Coulter.Tom@epa.gov

Joseph Tikvart
Environmental Protection Agency
Air and Radiation
D243-01, D243-01,
RTP, NC 27711
Phone:919 541-5562
Fax:919 541-0044
Email: Tikvart.Joe@epamail.epa.gov