DieselNet: Emissions Standards Diesel Net emission standards Emission Standards. Diesel Net. 2008-10-07. Diesel Net diesel engine emission controls Emission Standards. Diesel Net. 2008-10-07. Diesel Net Emission Standards. Diesel Net. 2008-10-07. http://www.dieselnet.com/standards/us/hd.php Medium- and Heavy-Duty Emission Standards DieselNet: Emissions Standards highway engines DieselNet: Emissions Standards Diesel Net