The Department of Environmental Protection adopted amendments to N.J. Admin. Code §7:27-14, Control and Prohibition of Air Pollution from Diesel-Powered Motor Vehicles. The amendments reduce opacity cutpoints, strengthen the visible smoke standard for diesel-powered trucks and buses, and clarify the rules' exemption for emergency vehicles. The rules also represent a revision to the SIP. The adopted amendments affect all heavy-duty diesel-powered motor vehicles, except U.S. EPA-regulated marine vessels and trains. http://www.nj.gov/dep/rules/adoptions/adopt_090504.pdf.