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What is done to reduce pollutionn by car...

What is done to reduce pollutionn by carbon monoxide or nitric oxide etc. formed furing combustion of fuels in automobiles ?

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Catalytic convertors consisting of transition metals and their oxides are fitted into the automobile axhauts system. They help in oxidatin of CO to `CO_(2)` and reduction of NO to `N_(2)` which are harmless guses.
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