EPA is granting a request by the Governor of the State of Texas to voluntarily reclassify the Houston/Galveston/Brazoria (HGB) ozone nonattainment area from a moderate 8-hour ozone nonattainment area to a severe 8-hour ozone nonattainment area. EPA is also setting April 15, 2010, as the date for the State to submit a revised State Implementation Plan (SIP) addressing the severe ozone nonattainment area requirements of the Clean Air Act (CAA).