The Environmental Protection Agency (EPA) is promulgating an interim final rule revising the current regulations which govern the award of program grants under section 105 of the Clean Air Act (the Act). The revisions ensure consistency with and continue implementation of the Clean Air Act Amendments of 1990 (1990 Amendments). This promulgation revises the regulations to incorporate changes governing maintenance of effort (MOE) and cost-sharing requirements, including provisions allowing a temporary waiver of the cost-sharing amounts, and other miscellaneous changes contained in the 1990 Amendments. DATES: This interim final rule is effective January 4, 1995. EPA solicits comments on this interim final rule until February 3, 1995.