EPA is finalizing a limited approval and limited disapproval of revisions to the applicable state implementation plan for the State of Nevada. The revisions include new or amended State rules governing applications for, and issuance of, permits for stationary sources, but not including review and permitting of major sources and major modifications under parts C and D of title I of the Clean Air Act. EPA is taking this action under the Clean Air Act obligation to take action on State submittals of revisions to state implementation plans. The intended effect of the limited approval and limited disapproval action is to update the applicable state implementation plan with current State rules with respect to permitting, and to set the stage for remedying deficiencies in the permitting rules with respect to certain new or revised national ambient air quality standards. This limited disapproval action would not trigger sanctions under section 179 of the Clean Air Act but does trigger an obligation on EPA to promulgate a Federal Implementation Plan unless the State of Nevada corrects the deficiencies, and EPA approves the related plan revisions, within two years of the final action.