Which one of the following cannot be controlled by a 3 way catalytic converter? (a) HC emission (b) CO emission (c) NOx emission (d) SPM emission

Which one of the following cannot be controlled by a 3 way catalytic converter? (a) HC emission (b) CO emission (c) NOx emission (d) SPM emission
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Catalytic converter used for controlling pollution is used in

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Catalytic converter used for controlling pollution is used in

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