Approval and Promulgation of Air Quality Implementation Plans; Maryland; Nitrogen Oxides (NOX

The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the State of Maryland. The revision (Maryland SIP Revision #18-03) pertains to a new Maryland regulation that establishes ozone season nitrogen oxides (NOX) emissions caps and other requirements for large non- electric generating units (non-EGU) in Maryland and includes associated revisions to two other Maryland regulations. The revision will enable Maryland to meet NOX reduction requirements related to interstate transport of pollution that contributes to other states' nonattainment or interferes with other states' maintenance of the ozone national ambient air quality standards (NAAQS). EPA is approving these revisions in accordance with the requirements of the Clean Air Act (CAA).