How much of the harmful substances in the car's exhaust emission does the catalytic converter purify?

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How much of the harmful substances in the car's exhaust emission does the catalytic converter purify?

Catalytic converters purify about 80-95% of the harmful substances in exhaust emissions, converting them to carbon dioxide and water.

However, catalytic converters do not reduce carbon dioxide emissions. The only way to reduce these is by decreasing fuel consumption.

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