- In 1991 the first State emission norms came into force for Petrol vehicles and in 1992 for Diesel vehicles.
- From April 1995, fitting of catalytic converters in new Petrol driven passenger cars was mandated in the four Metros and also introduction of unleaded petrol.
- From April 2000, unleaded petrol is available in the country.
- In developed countries lead was phased out from petrol over a period of more than 10 years, while in India this was achieved just in 6 years.
- The comparative statement of emission norms as under, indicates that the time gap between the introduction of norms in Europe and our country is narrowing:
- Bharat Stage–II norms, which are akin to Euro-II norms have been introduced in National Capital Region(NCR) for passenger vehicles upto GVW 3.5T from 1.4.2000 and for heavier vehicles from 24.10.2001 in National Capital Territory(NCT) of Delhi.
- In case of Mumbai, these have been extended from 1.1.2001 and 31.10.2001 respectively.
- For both Chennai and Kolkata, the corresponding dates are 1.7.2001 and 31.10.2001 respectively other than NCT of Delhi.
- These norms have further been extended to Agra, Ahmedabad, Bangalore, Hyderabad / Secundrabad, Kanpur, Pune and Surat from 1.4.2003, and Lucknow and Sholapur from 1.6.2004 for all category of vehicles.
- The transport vehicles plying on inter-State permits or on National Permits or on All India Tourist Permits or plying from these cities to the other regions of the respective States have been exempted.
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- Bharat Stage-II emission norms have been extended to entire country vide Gazette Notification No. G.S.R. 927 (E) dated 5.12.2003 and these has become effective from 1.4.2005.
- Basically Bharat Stage-II norms involve supply of Petrol and Diesel with 0.05% sulphur content.
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