(a) With the endorsement of the Secretary of Transportation and the Secretary of the Environment and after a public hearing following 60 days’ notice, the Administrator shall adopt regulations that establish maximum sound level limits for each type of new motor vehicle.

(b) In establishing limits under this section, the Administrator shall set the most restrictive level that, through the application of the best available technology at a reasonable cost, is consistent with attaining the environmental noise standards adopted by the Department of the Environment.