Maryland Code, Environment § 2-1102

(a) In consultation with the Administration and as provided under this subtitle, the Department shall establish by regulation and maintain a low emissions vehicle program that:

(b) As part of the program, the Department shall establish new motor vehicle emissions standards and compliance requirements for each model year included in the program as authorized by § 177 of the federal Clean Air Act.

(c) As part of the compliance requirements established under this subtitle, the Department may adopt by regulation motor vehicle emissions inspection, recall, and warranty requirements.

(d) The Department or any other State agency may not adopt a regulation under this subtitle or any other provision of law that requires the sale or use of California reformulated gasoline in the State.