The Environmental Protection Agency (EPA) is taking final action to approve a revision to the State Implementation Plan (SIP) for the State of Nebraska. This final action will amend the SIP to revise title 129 of the Nebraska Administrative Code by removing a portion of the SIP that addresses visible emissions from diesel-powered motor vehicles. Visible emissions from diesel-powered motor vehicles are addressed in the state statute. The revisions remove duplicative language that is redundant to the state statute. The revisions do not substantively change any existing statutory or regulatory requirement or impact the stringency of the SIP or air quality nor do they impact the State's ability to attain or maintain the National Ambient Air Quality Standards.