The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the state of Ohio on March 11, 2016. Ohio's SIP revision addresses requirements of the Clean Air Act (CAA) and EPA's rules that require states to submit periodic reports describing progress toward reasonable progress goals (RPGs) established for regional haze and a determination of the adequacy of the state's existing regional haze SIP. Ohio's progress report notes that Ohio has implemented the measures in the regional haze SIP due to be in place by the date of the progress report and that Federal Class I areas affected by emissions from Ohio are meeting or exceeding the RPGs for 2018. Ohio also determined that the state's regional haze SIP is adequate to meet these reasonable progress goals for the first implementation period and requires no substantive revision at this time.