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TCEQ Exceptional Event Flag Demonstrations

Demonstration documents supporting the proposed exceptional event flags for particulate matter and ozone data.

Exceptional events are unusual or naturally occurring events that affect air quality and are not reasonably controllable or preventable. Under Section 319 of the Federal Clean Air Act, states are responsible for identifying air quality monitoring data affected by an exceptional event and requesting that the United States Environmental Protection Agency (EPA) exclude the data from consideration when determining whether an area is in attainment or nonattainment of a National Ambient Air Quality Standard (NAAQS). The EPA has promulgated an exceptional event rule, 40 Code of Federal Regulations (Rule 50.14), and guidance to implement the requirements of the Federal Clean Air Act regarding exceptional events.

In accordance with federal regulations, the demonstration documents listed below were developed in support of the Texas Commission on Environmental Quality’s (TCEQ) proposed exceptional event flags and were posted for 30-day public review and comment. The public comments received on the proposed flags were forwarded to the EPA for consideration.

Previous Exceptional Event Demonstrations

Houston Clinton PM2.5 2010 Exceptional Events Document Adobe Acrobat PDF Document

Houston Clinton PM2.5 2011 Exceptional Events Document Adobe Acrobat PDF Document

Houston Clinton PM2.5 2012 Exceptional Events Document Adobe Acrobat PDF Document

El Paso Particulate Matter 2010-2012 Exceptional Events Document Adobe Acrobat PDF Document

El Paso 2010-2012 PM2.5 and PM10 Exceptional Events Demonstration Addendum Adobe Acrobat PDF Document

El Paso PM10 2017-2018 Exceptional Events Document Adobe Acrobat PDF Document

Ozone Data Exceptional Event Flag Demonstrations Adobe Acrobat PDF Document

Related Topics

Mitigation Plans for Exceptional Events in Texas Adobe Acrobat PDF Document

EPA Review of TCEQ Mitigation Plans Adobe Acrobat PDF Document