Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; Arizona

EPA is approving the maintenance plan for the Ajo area in Pima County, Arizona and granting the request submitted by the State to redesignate this area from nonattainment to attainment for the National Ambient Air Quality Standards (NAAQS) for sulfur dioxide (SO<INF>2</INF>). Elsewhere in this Federal Register, we are proposing approval and soliciting written comment on this action; if adverse written comments are received, we will withdraw the direct final rule and address the comments received in a new final rule; otherwise no further rulemaking will occur on this approval action.