West Virginia Code Chapter 22A. Miners' Health, Safety and Training § 22A-2A-403. Exhaust emissions control and conditioning systems

(1) A minimum standard, stated as an average percentage, for the reduction of diesel particulate matter emissions by a diesel particulate matter filter or other comparably effective emissions control device;

(2) A minimum standard, stated in parts per million, for the reduction of emissions of undiluted carbon monoxide, using an oxidation catalyst or other gaseous emissions control device;

(3) A minimum standard, stated in parts per million, for the reduction of emissions of oxides of nitrogen, using advanced control technology such as catalytic control technology or other comparably effective control methods; and

(4) Any additional requirements established by the rules of the commission prior to the enactment of this section, as may be supplemented or amended by legislative rules promulgated by the director or MSHA regulations relating to requirements for permissible mobile diesel-powered transportation equipment set forth in part 36, title thirty of the code of federal regulations, 30 C. F. R. § 36.1, et seq.