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This website publishes administrative rules on their effective dates, as designated by the adopting state agencies, colleges, and universities.

Rule 3745-31-18 | Attainment provisions - air quality models.


[Comment: For dates and availability of non-regulatory government publications, publications of recognized organizations and associations, federal rules, and federal statutory provisions referenced in this rule, see paragraph (LLLLLL) of rule 3745-31-01 of the Administrative Code titled, "referenced materials."]

(A) Applicability.

This rule applies to any major stationary source or major modification that is to be constructed in an area designated in 40 CFR 81.336 as attainment for an air pollutant for which the major stationary source or major modification is major.

(B) All estimates of ambient concentrations required under rule 3745-31-10 of the Administrative Code through rule 3745-31-27 of the Administrative Code shall be based upon the applicable air quality models, databases and other requirements specified in 40 CFR Part 51, Appendix W, "Guideline on Air Quality Models."

(C) Where an air quality impact model specified in 40 CFR Part 51, Appendix W, "Guideline on Air Quality Models," is inappropriate, the model may be changed or another model substituted. Such a change or substitution of a model may be made on a case-by-case basis or, where appropriate, on a generic basis for a specific State program. Written approval of the administrator of the United States environmental protection agency must be obtained for any change or substitution. In addition, use of a changed or substituted model must be subject to notice and opportunity for public comment under procedures developed in accordance with Chapter 3745-49 of the Administrative Code.

Last updated November 30, 2022 at 10:19 AM

Supplemental Information

Authorized By: 3704.03(F)
Amplifies: 3704.03(A), 3704.03(F)
Five Year Review Date: 5/23/2020
Prior Effective Dates: 4/12/1996, 12/1/2006