The United States Environmental Protection Agency (EPA) approves Minnesota's 1993 periodic carbon monoxide (CO) emission inventory. The inventory was submitted by the State of Minnesota to satisfy a Federal requirement that those States containing CO nonattainment areas (NAA's) classified moderate and serious submit a revised emission inventory (i.e., from the 1990 base year inventory) at the end of each 3 year period thereafter, until the area is redesignated to attainment. It is an inventory of actual CO season emissions from all sources, in accordance with EPA guidance. The geographic area covered in the 1993 periodic CO emission inventory includes counties of the Twin Cities seven county metropolitan area (Anoka, Carver, Dakota, Hennepin, Ramsey, Scott, and Washington), and Wright County. The rationale for this approval is set forth in this final rule; additional information is available at the address indicated below in the supporting Technical Support Document (TSD). Elsewhere in this Federal Register, EPA is proposing approval and soliciting comment on this action; if adverse comments are received, EPA will withdraw the direct final rulemaking and address the comments received in a new final rule; otherwise no further rulemaking will occur on this action.