Discuss Euro $III$ norms.

(N/A) The Government of India has implemented a new auto fuel policy to reduce vehicular pollution in Indian cities.
Euro $III$ norms are part of these strict regulations aimed at reducing the levels of sulphur and aromatic compounds in petrol and diesel fuels.
Specifically,Euro $III$ norms stipulate that sulphur levels must be controlled at $350 \ ppm$ in diesel and $150 \ ppm$ in petrol.
Furthermore,the content of aromatic hydrocarbons in these fuels must be contained at $42$ percent.