2019-03867: Approval and Promulgation of Air Quality Implementation Plans; State of Montana; Missoula PM10 Nonattainment Area Limited Maintenance Plan and Redesignation Request
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The Environmental Protection Agency (EPA) is proposing to fully approve the Limited Maintenance Plan (LMP), submitted by the State of Montana to the EPA on August 3, 2016, for the Missoula moderate particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM<INF>10</INF>) nonattainment area (Missoula NAA) and concurrently redesignate the Missoula NAA to attainment of the 24-hour PM<INF>10</INF> National Ambient Air Quality Standard (NAAQS). In order to approve the LMP and redesignation, the EPA is proposing to determine that the Missoula NAA has attained the 1987 24-hour PM<INF>10</INF> NAAQS of 150 [micro]g/m\3\. This determination is based upon monitored air quality data for the PM<INF>10</INF> NAAQS during the years 2015- 2017. The EPA is also proposing to approve the Missoula LMP as meeting the appropriate transportation conformity requirements. Lastly, the EPA is proposing to approve certain rule revisions the Missoula City-County Air Pollution Control Program submitted on August 3, 2016 and August 22, 2018.
The agency’s own summary, as published.
What this changes
Amends 1 part of the Code of Federal Regulations — the standing rules this notice rewrites.
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