Maryland Code, Transportation § 23-402

(a)(1) The Secretary of the Environment, the Secretary of State Police, and the Secretary of Transportation shall jointly establish, by regulation, a Diesel Vehicle Emissions Control Program.

(2) The Secretary of the Environment, the Secretary of State Police, and the Secretary of Transportation shall jointly adopt regulations to implement, administer, regulate, and enforce the provisions of this subtitle.

(1) Establishing diesel vehicle emissions standards;

(2) Emissions tests for diesel vehicles that may include direct emissions measurements;

(3) Emissions test equipment;

(4) Subject to § 23-403 of this subtitle, establishing emissions test procedures, based on information available from the U.S. Environmental Protection Agency and information regarding standards issued by the Society of Automotive Engineers, that provide for conducting an emissions test; and

(5) Establishing certification requirements for emissions inspectors.