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EPA/OAR RIN: 2060-AS02 Publication ID: Fall 2016 
Title: Treatment of Data Influenced by Exceptional Events -- Rule Revisions 

This final action will revise the Exceptional Events Rulemaking to clarify and streamline certain rule elements, including, but not limited to, those associated with high wind dust events, wildfire and prescribed fire events, normal historical fluctuations including background, the "not reasonably controllable or preventable" criterion, and the "but for' criterion." On March 22, 2007, the EPA promulgated the "Treatment of Data Influenced by Exceptional Events; Final Rule" pursuant to the 2005 amendment of Clean Air Act. This rule, known as the Exceptional Events Rule (EER), superseded the EPA's previous natural events guidance and those sections of the interim fire policy document that address exceptional events. The EER created a regulatory process by which air agencies can request, and the EPA can approve, exclusion for data influenced by exceptional events. The Exceptional Events Rulemaking regulatory sections contain definitions, procedural requirements, requirements for air agency demonstrations, and criteria for the EPA approval for the exclusion of air quality data from regulatory decisions under the EER. Since EPA promulgated the EER in 2007, numerous interested parties have raised questions and issues regarding implementation of the rule.

Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR Part 50     (To search for a specific CFR, visit the Code of Federal Regulations.)
Legal Authority: 42 U.S.C. 7401 et seq   
Legal Deadline:  None
Action Date FR Cite
NPRM  11/20/2015  80 FR 72839   
NPRM Comment Period Extended  12/30/2015  80 FR 81495   
NPRM Comment Period End  01/19/2016 
NPRM Comment Period Extended End  02/03/2016 
Final Rule  11/00/2016 
Additional Information: Docket #:EPA-HQ-OAR-2013-0572
Regulatory Flexibility Analysis Required: No  Government Levels Affected: State, Tribal 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Information URL:  
RIN Data Printed in the FR: No 
Agency Contact:
Elizabeth Palma
Environmental Protection Agency
Office of Air and Radiation
Research Triangle Park, NC 27711
Phone:919 541-5432