Explain the new auto-fuel policy laid down by the Government of India.

(N/A) The Government of India has implemented stringent norms to reduce vehicular pollution,known as the Bharat Stage $(BS)$ Emission Standards. These standards are equivalent to the European emission norms. Currently,the country has transitioned to $BS-VI$ norms to further curb emissions.

Type of Vehicles	Norms	Implementation Status
$4$ Wheelers	Bharat Stage $VI$	Nationwide since April $2020$
$3$ Wheelers	Bharat Stage $VI$	Nationwide since April $2020$
$2$ Wheelers	Bharat Stage $VI$	Nationwide since April $2020$

Key features of the auto-fuel policy include:
$1$. Reduction in sulfur content in petrol and diesel to $50$ ppm (parts per million) and eventually to $10$ ppm in $BS-VI$ fuels.
$2$. Reduction in levels of aromatic hydrocarbons in fuel.
$3$. Mandatory use of catalytic converters in vehicles to reduce emission of poisonous gases like carbon monoxide and nitrogen oxides.