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In 2016, EPA reclassified the Houston-Galveston-Brazoria (HGB) area from a Marginal to a Moderate nonattainment classification for the 2008 ozone standard. As of April 2019, changes to the Texas Clean Air Plan were approved by the EPA.

The updates were made to improve the regulation of storage tanks in order to reduce VOC emissions, which lead to the formation of ozone. Updates include a control efficiency requirement of 95% for tanks that require control and updates to inspection and repair requirements, for fixed roof crude oil and condensate storage tanks.

Excess ozone in the air we breathe can be harmful to our health. This plan will help the Houston-Galveston-Brazoria area enhance the quality of its air, and attain the 2008 ozone standard. Texas is committed to improving the air quality of the area by reducing ozone emissions. EPA determined these improved regulations work with the state's existing VOC and nitrogen oxide (NOx) regulations to meet Clean Air Act requirements, for reasonably available control technology and improve air quality.

To read more about the Plan to Reduce Ozone-Creating Emissions please visit the website at