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This action would apply in certain states for which EPA has either disapproved a “good neighbor” state implementation plan (SIP) submission under CAA section 110(a)(2)(D)(i)(I) or has made a finding of failure to submit such a SIP submission for the 2015 ozone NAAQS. This action would determine whether and to what extent ozone-precursor emissions reductions are required to eliminate significant contribution or interference with maintenance from upwind states that are linked to air quality problems in other states for the 2015 8-hour ozone NAAQS. For states that EPA determines to be linked to a downwind nonattainment or maintenance receptor, EPA would conduct further analysis to determine what (if any) additional emissions controls are required in such states and develop an enforceable program for implementation of such controls.