The Clean Air Act, as amended, provided that for each national ambient air quality standard (NAAQS) promulgated by the EPA, a State Implementation Plan (SIP) was to be developed which was to contain emission control measures that would provide for attainment and maintenance of such national standards, generally within three years of the approval of the SIP. This Control Strategy Preparation Manual for Photochemical Oxidant has been prepared to provide guidance to State and local control agencies on the development of an approvable control plan. The procedures outlined in this document should be followed by States, or EPA where necessary, in developing an approvable control strategy for photochemical oxidant. Section I provides an overview of the various factors to be considered in the development of an approvable control strategy for photochemical oxidant. Section II sets forth a fairly concise step-by-step procedure that a control strategy developer should follow in preparing an approvable control strategy. Section III provides, in question-and-answer format, additional information to provide a more detailed explanation of the recommended procedures outlined in Section II. Section IV includes additional information on existing inspection/maintenance programs.