What is euro technology which is used inTATA nano car?

Euro is not being used for the first time in india...all vehicles hav it comply with tat standard.... Euro is a emission standard given by the goverment.... all vehicles hav to comply with that standard.... there r various version of euro like euro1,euro2,euro3,euro4,euro5.... the exhaust coming out of the automobiles gives out pollutants like hydrocarbons,oxides of nitrogen and carbon monooxide....this cant be completely eliminated... so they give a regulation tat only so many percentage of those gases is allowed.... So the Euro standard has the percentage of gases which is allowed....As the version of euro increases the percentage of gas amount will decrease... its means tat the vehicle will pollute very less........... now for trucks euro3 in being followed for cars euro 4 and euro5.... to achieve those percentage of gases the vehicle manufacturer should design a car such tat it meets the emission norms.... to know more abt the percentage of gases in various version of euro u can visit dis website (http://en.wikipedia.org/wiki/Emission_s... 1,Bharat 2 etc are being used in india... which is similar to Euro