The Environmental Protection Agency (EPA) is determining that the Houston-Galveston-Brazoria, Texas 2008 8-hour ozone nonattainment area (HGB area) failed to attain the 2008 8-hour ozone national ambient air quality standard (NAAQS) by the applicable attainment deadline of July 20, 2016, and thus is classified by operation of law as "Moderate". In this action, EPA is also determining January 1, 2017 as the deadline by which Texas must submit to the EPA the State Implementation Plan (SIP) revisions that meet the Clean Air Act (CAA) statutory and regulatory requirements that apply to 2008 ozone NAAQS nonattainment areas reclassified as Moderate.