Austin-Round Rock: Current Attainment Status

Note: This table provides a list of designations and classifications for current, active NAAQS. While NAAQS that have been revoked by the EPA do not appear in this table, some anti-backsliding obligations may continue to apply for revoked standards. This table is to be used for informational purposes only and should not be used to determine regulatory requirements in any of the counties listed.

Austin–Round Rock Area: Attainment Status by Pollutant

*The United States Environmental Protection Agency (EPA) revoked the one-hour ozone standard and the 1997 eight-hour ozone standard in all areas, although some areas have continuing obligations under these standards. See ozone history for more information.

**The standard is scheduled to be revoked one year after the effective date of final designations for the 75 ppb standard.

For more information on attainment status, visit the EPA's Green Book  webpage regarding nonattainment areas for criteria pollutants.

Austin–Round Rock Attainment Areas

2015 Eight-Hour Ozone Standard Designations: Attainment/Unclassifiable, effective January 16, 2018 ( 82 FR 54232 )

On October 1, 2015, the EPA lowered the primary and secondary eight-hour ozone NAAQS to 0.070 parts per million ( 80 FR 65292 ). Travis, Williamson, Bastrop, Hays, and Caldwell Counties were designated attainment/unclassifiable under the 2015 eight-hour ozone NAAQS, effective January 16, 2018. 

2008 Eight-Hour Ozone Standard Designations: Unclassifiable/Attainment, effective July 20, 2012 ( 77 FR 30088 )

On March 27, 2008, the EPA lowered the primary and secondary eight-hour ozone NAAQS to 0.075 parts per million (ppm) ( 73 FR 16436 ). Travis, Williamson, Bastrop, Hays, and Caldwell Counties were designated unclassifiable/attainment under the 2008 eight-hour ozone NAAQS, effective July 20, 2012.   

1997 Eight-Hour Ozone Standard Designations: Attainment, April 30, 2004 ( 69 FR 23858 ) 

On December 18, 2002, local governments in Travis, Williamson, Bastrop, Hays, and Caldwell counties entered into a voluntary Early Action Compact (EAC) agreement with the TCEQ and the EPA for the 1997 eight-hour ozone standard. On March 31, 2004, a final EAC plan was submitted to the TCEQ for incorporation into the State Implementation Plan. On November 17, 2004, the commission adopted the EAC attainment demonstrations for Austin, San Antonio, and Northeast Texas , and, at the request of the Austin and San Antonio areas, rule changes to 30 TAC 114 and 115.

National Ambient Air Quality Standards

The EPA has set National Ambient Air Quality Standards  (NAAQS) for six principal criteria pollutants: ground-level ozone, lead, carbon monoxide, nitrogen dioxide, sulfur dioxide, and particulate matter. 

No later than one year after promulgation of a new or revised NAAQS for any pollutant, the governor must submit designation recommendations to the EPA for all areas of the state. The EPA must then promulgate the designations within two years of promulgation of the revised NAAQS. Areas that do not meet (or contribute to ambient air quality in a nearby area that does not meet) the NAAQS are designated nonattainment. Areas that meet the NAAQS are designated attainment; and areas that cannot be classified based on the available information, unclassifiable.

For ozone, the federal Clean Air Act establishes nonattainment area classifications ranked according to the severity of the area’s air pollution problem. These classifications—marginal, moderate, serious, severe, and extreme—translate to varying requirements with which Texas and nonattainment areas must comply.