Montana Second 10-Year Carbon Monoxide Maintenance Plan for Missoula

The Environmental Protection Agency (EPA) is taking direct final action approving a State Implementation Plan (SIP) revision submitted by the State of Montana. On September 19, 2016, the Governor of Montana submitted to the EPA a Clean Air Act (CAA) section 175A(b) second 10-year maintenance plan for the Missoula, Montana area for the carbon monoxide (CO) National Ambient Air Quality Standard (NAAQS). This limited maintenance plan (LMP) addresses maintenance of the CO NAAQS for a second 10-year period beyond the original redesignation. This action is being taken under sections 110 and 175A of the CAA.