The requirements of section 169A of the Clean Air Act are met because the Regional Haze plan submitted by Iowa on March 25, 2008 and supplemented on May 14, 2019, includes fully approvable measures for meeting the requirements of the Regional Haze Rule including 40 CFR 51.308(d)(3) and 51.308(e) with respect to emissions of NOX and SO2 from electric generating units.