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Austin-Round Rock and the State Implementation Plan

Information on the State Implementation Plan (SIP) to improve air quality in the Austin-Round Rock area and meet the requirements of the Federal Clean Air Act. The area includes Travis, Williamson, Bastrop, Hays, and Caldwell counties.

Image of Austin Area

Attainment Status

Current air quality designations for the six criteria pollutants

Air Quality History

Austin air quality history from the 1990s
to the present

Latest Activities

Information about the latest events and activities related to Austin and the SIP

Air Quality Plans

Adopted SIP revisions and agreements from the 1970s to the present

Air Quality Control Measures

Information on air quality control measures implemented in Texas

Contact Information and Related Links

How to contact TCEQ SIP staff, local air quality planning groups, and other helpful links