Air Quality State Implementation Plans; Approvals and Promulgations: Pennsylvania; Redesignation Request and Associated Maintenance Plan for the Johnstown Nonattainment Area for the 1997 Annual and 2006 24-Hour Fine Particulate Matter Standard
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Air Quality State Implementation Plans; Approvals and Promulgations: Pennsylvania; Redesignation Request and Associated Maintenance Plan for the Johnstown Nonattainment Area for the 1997 Annual and 2006 24-Hour Fine Particulate Matter Standard
Source: EPA Regulations news 2