find about about euro 1 and euro 2 emission norms towards reducing air pollution?

WHAT ARE THE EURO I AND EURO II NORMS?
The Euro norms require manufacturers to reduce the existing Polluting Emission Levels in a more efficient manner by making certain technical changes in their vehicles.

WHEN & WHERE DID THE ABOVE EURO I AND EURO II NORMS INTRODUCED?
The above EURO I NORM from 1st JUNE 1999 is applicable only in the NCR (DELHI) as per the Supreme Court Ruling and the Government Regulations and the EURO II norm will be applicable to NCR from 1st APRIL 2000 . The EURO I norm will be applicable to Mumbai from January 1, 2000 while the EURO II norm will be applicable to MUMBAI from 1st APRIL 2000.

WHAT CHANGES DO MANUFACTURERS HAD TO MAKE IN ORDER TO MAKE EURO COMPLIANT VEHICLES?
The following changes normally will be made by manufacturers in order to have a EURO I compliant car. Typically, the following areas would require attention: (a) carburetor retuning (b) secondary air intake (c) exhaust gas re circulation (d) catalyses capacity increase (e) trimetal coating in the catalyses.

Changes for having a Euro II compliant vehicle require that the carburetor be replaced by an MPFI system i.e. a Multi-point Fuel Injection System. There are two basic types of engines, spark ignition and compression ignition engines. In the former, fuel ignition is triggered by an electric spark from a spark plug, while in the latter, atomized liquid fuel is injected with the help of a fuel pump and a nozzle into a cylinder full of hot compressed air, which results in ignition taking place. Larger cylinders which need more fuel require more than one injector, thus resulting in a multi-point fuel injection system.