Exceptional Event Demonstrations for Particulate Matter
Explanation of exceptional event flags. Demonstrations supporting the proposed exceptional event flags for particulate matter data.
(Esta página en español. / This page in Spanish.)
About Exceptional Events
Definition
Exceptional events are unusual or naturally occurring events that affect air quality and are not reasonably controllable or preventable. Wildfires are an example.
How They Affect Monitoring Data
States can request that the United States Environmental Protection Agency (EPA) exclude air quality monitoring data affected by an exceptional event from determining if an area met an air quality health standard . The demonstration documents below were developed in support of the TCEQ's proposed exceptional event flags.
EPA Regulations and Guidance
Exceptional event regulations and guidance are provided on EPA's Treatment of Air Quality Data Influenced by Exceptional Events website.
Current Exceptional Event Demonstration Proposals
El Paso PM10 Demonstration for December 23, 2020
Previous Exceptional Event Demonstrations
El Paso Demonstrations
- El Paso PM10 2017-2018 Exceptional Events Document
- El Paso PM2.5 and PM10 2010-2012 Exceptional Events Document and Addendum
Houston Clinton Monitor Demonstrations
Related Topics
- Ozone Exceptional Event Demonstrations
- Mitigation Plans for Exceptional Events in Texas
- EPA Review of TCEQ Mitigation Plans
- International transport demonstrations to Texas nonattainment areas
- TCEQ Index of Air Topics lists a wide range of programs and how the agency is working to improve air quality in Texas