Section 19-519. Anti-noise and air pollution provisions

a.  Definitions.  The  term "octane rating" shall mean research octane
  rating or number measured by the research method.
    The term zero grams lead per gallon shall include gasoline  containing
  up to 0.075 grams of lead per gallon.
    b.  Effective  July  first,  nineteen  hundred  seventy-one, all motor
  vehicles licensed under  the  provisions  of  this  chapter,  which  are
  manufactured  in  the model years nineteen hundred seventy-two or later,
  shall be equipped with an  engine  designed  to  operate  on  non-leaded
  gasoline.  All motor vehicles manufactured prior to the nineteen hundred
  seventy-two model year which are licensed under the provisions  of  this
  chapter shall operate in the city on the effective dates set forth below
  only  on  gasoline  which  contains no more than the following amount of
  lead by weight for the respective octane ranges as follows:
 
                                      96 Octane No.       96 Octane No.
                                       &Above            &Below
  1. On and after July 1, 1971...   2.0 grams per gal.  1.5 grams per gal.
  2. On and after Jan. 1, 1972...   1.0 grams per gal.  1.0 grams per gal.
  3. On and after Jan. 1, 1973...   0.5 grams per gal.  0.5 grams per gal.
  4. On and after Jan. 1, 1974...   zero grams          zero grams
 
    c. Effective July  first,  nineteen  hundred  seventy-one,  all  motor
  vehicles  manufactured in model years prior to nineteen hundred seventy,
  which are licensed  under  the  provisions  of  this  chapter  shall  be
  equipped with such emission control devices or otherwise comply with the
  standards   governing   levels   of   emissions   for  carbon  monoxide,
  hydrocarbons and oxides of nitrogen applicable to  light  duty  vehicles
  and  engines  manufactured  in  model  year  nineteen hundred seventy in
  accordance with Federal Public  Law  91-604  cited  as  the  "Clear  Air
  Amendments of nineteen hundred seventy."
    d.  Effective  July  first,  nineteen  hundred  seventy-one, all motor
  vehicles manufactured in model years nineteen  hundred  seventy-one  and
  thereafter,  which  are  licensed  under  the provisions of this chapter
  shall be equipped with such emission control devices or otherwise comply
  with the standards  governing  levels  of  emissions  for  particulates,
  carbon  monoxide, hydrocarbons and oxides of nitrogen established by the
  commission, which in  no  event  shall  be  less  stringent  than  those
  promulgated  by  federal,  state  or  local  agencies, whichever is most
  stringent.
    e. No driver shall operate or use a  horn  or  similar  signal  device
  installed  on  a licensed vehicle except as a signal of imminent danger.
  The commission shall issue regulations and adopt  programs  facilitating
  the  enforcement  of subdivision a and paragraph one of subdivision b of
  section 10-107  of  the  code  and  shall  be  authorized  to  entertain
  complaints against drivers of licensed vehicles charged with a violation
  thereof.