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San Antonio: Ozone History

Background and history of San Antonio area compliance with the National Ambient Air Quality Standards (NAAQS) for ground-level ozone.

2008 Eight-Hour Ozone Standard (2008 to Present)

On March 27, 2008, the United States Environmental Protection Agency (EPA) strengthened the primary and secondary eight-hour ozone NAAQS to 0.075 parts per million (73 FR 16436Exit the TCEQ. On March 10, 2009, the governor recommended to the EPA that Bexar County be designated nonattainment for the 2008 ozone NAAQS (see the governor's letter to EPA region 6). Exit the TCEQ

In September 2009, the EPA announced it would reconsider the 2008 NAAQS, and on January 19, 2010, proposed to lower the primary ozone standard to a range of 0.060–0.070 ppm, and proposed a separate secondary standard based on cumulative seasonal average ozone concentrations. On September 2, 2011, President Obama announced that he had requested the EPA withdraw the proposed reconsidered ozone standard.

In a memo dated September 22, 2011 from EPA Assistant Administrator Gina McCarthy, the EPA announced that it would proceed with initial area designations under the 2008 eight-hour ozone standard, starting with the recommendations states made in 2009 and updating them with the most current, certified air quality data (2008 through 2010).

On May 21, 2012, the EPA published in the Federal Register final designations for the 2008 eight-hour ozone NAAQS (77 FR 30088Exit the TCEQ. Bexar, Comal, Guadalupe, and Wilson Counties were designated attainment/unclassifiable under the 2008 eight-hour ozone NAAQS, effective July 20, 2012.   

1997 Eight-Hour Ozone Standard (1997 to Present)

On December 9, 2002, the Alamo Area Council of Governments Exit the TCEQ, a stakeholder group for the San Antonio area, signed an Early Action Compact (EAC). On March 31, 2004, a final EAC plan was submitted to the TCEQ for incorporation into the state implementation plan (SIP).

On November 17, 2004, the commission adopted revisions to the SIP for the Austin, San Antonio, and Northeast Texas EAC areas and 30 Texas Administrative Code, Chapters 114 and 115. The San Antonio EAC SIP Revision consists of an eight-hour ozone attainment demonstration for the area based on the local plan submitted to TCEQ by the area in March 2004 under its EAC. This revision contains results of photochemical modeling and technical documentation in support of the attainment demonstration. As a result of these analyses, and at the request of the San Antonio local governments, the revision includes, for all four counties, changes to the rules on volatile organic compounds in degreasing and Stage I vapor recovery.

On April 2, 2008, the EPA issued final action to designate 13 EAC areas (including San Antonio) attainment for the 1997 eight-hour ozone standard, as they met all milestones of the EAC program and demonstrated attainment of the standard by December 31, 2007. The effective date of this final action is April 15, 2008. Additionally, the EPA stated that the one-hour ozone standard for each of the 13 EAC areas would be revoked one year after the effective date of their attainment designation.

The San Antonio area attainment designation for the 1997 eight-hour ozone standard means that there are no further SIP requirements for the standard as long as the area continues to monitor attainment. Additional information Exit the TCEQ is available from the EPA about its final action.

Comprehensive History of the Texas SIP

This SIP History gives a broad overview of the SIP revisions that have been submitted to the EPA by the State of Texas. Some sections may be obsolete or superseded by new revisions but have been retained for the sake of historical completeness.