Section 19-536. Clean air vehicle labeling and information

a. For the
  purposes of this section, the term "clean air vehicle"  shall  mean  any
  taxicab  approved  for  use  by  the  commission  that  receives  an air
  pollution score of 9.0 or higher from the  United  States  environmental
  protection  agency  or its successor agency and is estimated to emit 6.4
  tons or less of equivalent carbon dioxide per year by the United  States
  department of energy or its successor agency; provided that such vehicle
  is  powered by the fuel for which such vehicle meets the above-specified
  standards. In the event the  test  method  used  by  the  United  States
  environmental  protection agency or its successor agency for determining
  fuel economy is adjusted in a way that impacts United States  department
  of energy or its successor agency estimates of equivalent carbon dioxide
  emissions  for  motor  vehicles, the commission shall, for vehicles that
  fall within the affected model years,  modify  by  rule  the  equivalent
  carbon dioxide emissions estimate included herein so as to appropriately
  reflect  such  adjustment's  impact  consistent  with the intent of this
  section.
    b. The commission shall develop and provide information to each  owner
  of  a  clean  air  vehicle, which shall be made available for viewing in
  each such vehicle in a manner that is clearly apparent  to  a  passenger
  located  in the back seat of such vehicle, and which (i) identifies such
  vehicle as a clean  air  vehicle;  (ii)  includes  the  address  of  the
  commission  web  page(s)  required to be established pursuant to section
  19-534 of this chapter; and (iii) includes, to the  extent  practicable,
  the  estimated  air  quality  benefits  associated  with the use of such
  vehicle and the type of fuel used to power such vehicle.