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New petrol-engined cars must be fitted with catalytic converters. The reason for this is to

A reduce harmful exhaust emissions
We should all be concerned about the effect traffic has on our environment. Fumes from vehicles are polluting the air around us. Catalytic converters act like a filter, removing some of the toxic waste from exhaust gases.
B control exhaust noise levels
C prolong the life of the exhaust system
D allow the exhaust system to be recycled