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On April 11, 2016, the U.S. Environmental Protection Agency (EPA) disapproved of the Interstate Transport State Implementation Plan for maintenance of the 2008 Ozone National Ambient Air Quality Standard (NAAQS) in other states as submitted by the Texas Commission of Environmental Quality (TCEQ) on December 13, 2012. EPA is specifically disapproving interstate transport of air pollution that will impact the nonattainment status or maintenance of the 2008 Ozone NAAQA in other states. EPA separately disapproved of the interstate transport piece of the SIP in a January 5, 2016 rulemaking for regional haze.

EPA concludes that Texas' assessment on past air quality due to ozone precursors - oxides of nitrogen (NOX) and volatile organic compounds (VOC) - is correct and ozone concentrations have trended downwards. However, EPA alleges that TCEQ did not adequately address emissions of NOX and VOC from Texas sources on surrounding states since TCEQ only looked at impacts of ozone precursors in areas that were deemed to be nonattainment at the time of the modeling assessment. In addition, EPA states that the TCEQ did not look at areas that could become nonattainment due to emissions from Texas sources.

To find out more about how EPA came to this conclusion, and how this could impact your facility, click here, or contact Trinity Consultants at (972) 661-8100.