Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; State of Indiana

摘要

The United States Environmental Protection Agency (USEPA) is approving three requests to redesignate marginal ozone nonattainment areas in the State of Indiana to attainment. The USEPA is also approving their accompanying maintenance plans as State Implementation Plan (SIP) revisions. The redesignation requests and maintenance plans were submitted by the Indiana Department of Environmental Management (IDEM) for the following ozone nonattainment areas: St. Joseph and Elkhart, Vanderburgh, and Marion Counties. The State has met the requirements for redesignation contained in the Clean Air Act (the Act), as amended in 1990. The redesignation requests are based on ambient monitoring data that show no violations of the ozone National Ambient Air Quality Standard (NAAQS) during the three-year period from 1990 through 1992. In the proposed rules section of this Federal Register, USEPA is proposing approval of and soliciting public comment on these requested redesignations and SIP revisions. If adverse comments are received on this direct final rule, USEPA will withdraw this final rule and address these comments in a final rule on the related proposed rule which is being published in the p