Pursuant to the Federal Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is approving portions of three Texas State Implementation Plan (SIP) submittals pertaining to CAA requirements to prohibit emissions which will significantly contribute to nonattainment or interfere with maintenance of the 1997 and 2006 fine particulate matter (PM<INF>2.5</INF>) National Ambient Air Quality Standards (NAAQS) in other states.