Which of these items is not in some way reduced by the use of catalytic converters in the combustion of gasoline?

Name: Which of these items is not in some way reduced by the use of catalytic converters in the combustion of gasoline?
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Question

Quizplus · Accepted Answer

CO₂ is not reduced by the use of catalytic converters in the combustion of gasoline. Catalytic converters reduce the emissions of CO, NO, and partially burned hydrocarbons, which contribute to photochemical smog.

Which of These Items Is Not in Some Way Reduced