The United States Environmental Protection Agency (USEPA) is approving through ``direct final'' procedure, an October 20, 1997, request from Ohio, for a State Implementation Plan (SIP) maintenance plan revision for the Jefferson County ozone maintenance area. The maintenance plan revision is allocating to the mobile source emission budget for transportation conformity purposes a portion of the existing safety margin. The safety margin is the difference between the attainment inventory level of the total emissions and the projected levels of the total emissions in the final year of the maintenance plan.