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Proposed El Paso PM10 Exceptional Event Demonstration for Public Review

The public is invited to comment on the proposed exceptional event flags demonstration for particulate matter less than 10 micrometers in diameter (PM10) data collected in El Paso in 2017 and 2018.

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, a demonstration document supporting the Texas Commission on Environmental Quality (TCEQ) proposed exceptional event flags for El Paso PM10 data for 2017 and 2018 is provided through the link below for public review and comment. There are two PM10 proposed exceptional event flags for data collected at the Socorro Hueco monitoring site on two separate days in 2017 and 2018. Both of the proposed flags are for high wind regional blowing dust events that are described in more detail in the demonstration document.

The TCEQ is accepting comments on the proposed flags and will address and forward these comments to the EPA for consideration. The EPA will review this demonstration document along with any comments received and decide whether to accept or reject each proposed flag. The data with flags where EPA concurs will be removed from consideration for determinations of compliance with the PM10 NAAQS.

Comments should be submitted by e-mail to monops@tceq.texas.gov with “PM-FLAGS” as the subject. Comments will be taken until 5 p.m. on November 11, 2019.

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

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

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