District of Columbia Code Division VIII. General Laws. § 50-301.27. Fuel-efficient taxicabs.

(a) Within 5 years of October 22, 2012, each owner of a licensed taxicab operating in the District shall maintain average vehicle greenhouse gas emissions at a level set by the DFHV in consultation with the District Department of the Environment that will contribute to an overall goal of a 20% reduction in taxicab fleet greenhouse gas emissions by the year 2020. Wheelchair-accessible vehicles are exempt from compliance with greenhouse gas emission standards.

(b) The DFHV shall publicize on its website fuel-efficiency information available from DDOE about vehicles used as public vehicles-for-hire and, upon request, distribute this information at no charge to public vehicle-for-hire operators.