EPA is approving revisions to the State Implementation Plan (SIP) submitted by the South Carolina Department of Health and Environmental Control (SC DHEC) on November 19, 2004, for the purpose of incorporating EPA's July 18, 1997, revisions to the National Ambient Air Quality Standards and to ensure consistency between state and Federal regulations. The revisions consist of the amendments published in the South Carolina State Register on September 24, 2004, revising Regulation 61-62.5, Standard Number 2, Ambient Air Quality Standards.