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EPA/AR RIN: 2060-AS02 Publication ID: Fall 2013 
Title: ●Treatment of Data Influenced by Exceptional Events--Rule Revisions 
Abstract: This proposal 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, historical fluctuations, the "not reasonably controllable or preventable" criterion, and "but for." On March 22, 2007, the EPA promulgated the "Treatment of Data Influenced by Exceptional Events; Final Rule" (72 FR 13560) pursuant to the 2005 amendment of Clean Air Act (CAA) Section 319. This rule, known as the Exceptional Events Rule (EER), superseded the EPA's previous natural events guidance and those sections of the interim fire policy document that address exceptional events.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 codified at 40 CFR parts 50 and 51 (50.1, 50.14 and 51.930). These regulatory sections contain definitions, procedural requirements, requirements for air agency demonstrations, and criteria for 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: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 51    40 CFR 50   
Legal Authority: title 42    chapter 85    subchapter III    sec 7619 (CAA sec 319)   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  04/00/2014 
Final Rule  04/00/2015 
Regulatory Flexibility Analysis Required: Undetermined  Government Levels Affected: None 
Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Wei-An Chang
Environmental Protection Agency
Air and Radiation
1200 Pennsylvania Avenue NW,
Washington, DC 20460
Phone:202 564-6658
Email: chang.andy@epa.gov