law: Air (Prevention and Control of Pollution) Act, 1981
  20. Power to give Instructions for Ensuring Standards for Emission From Automobiles.
  With
  
  a view to ensuring that the standards for emission of air pollutants from
  
  automobiles laid down by the State Board under clause (g) of sub-section (1) of
  
  Section 17 are compiled with, the State Government shall, in consultation with
  
  the State Board, give such instructions as may be deemed necessary to the
  
  concerned authority in charge of registration of motor vehicles under the Motor
  
  Vehicles Act, 1939 (4 of 1939), and such authority shall, notwithstanding
  
  anything contained in that Act or the rules made thereunder be found to comply
  
  with such instructions.