Catalytic converters in cars primarily reduce which emissions?

Catalytic converters in cars primarily reduce which emissions?

• A. Carbon monoxide and hydrocarbons
• B. Nitrogen oxides
• C. Lead
• D. Ozone

Answer: (A)

Catalytic converters act like quick chemical editors for exhaust gases, using catalysts to transform harmful pollutants into less harmful ones as the exhaust passes through. The most direct and noticeable change is the oxidation of carbon monoxide and unburned hydrocarbons into carbon dioxide and water, which lowers the amounts of CO and hydrocarbons in the exhaust right away. They also promote reactions that reduce nitrogen oxides, but the primary direct reduction most people notice from the converter is CO and hydrocarbons. Lead isn’t a target of the catalytic converter, and ozone isn’t emitted directly by car exhaust (it forms later in the atmosphere from NOx and VOCs, though cutting those pollutants can help limit ozone formation). So the best answer is the emissions most directly addressed: carbon monoxide and hydrocarbons.

Catalytic converters act like quick chemical editors for exhaust gases, using catalysts to transform harmful pollutants into less harmful ones as the exhaust passes through. The most direct and noticeable change is the oxidation of carbon monoxide and unburned hydrocarbons into carbon dioxide and water, which lowers the amounts of CO and hydrocarbons in the exhaust right away. They also promote reactions that reduce nitrogen oxides, but the primary direct reduction most people notice from the converter is CO and hydrocarbons. Lead isn’t a target of the catalytic converter, and ozone isn’t emitted directly by car exhaust (it forms later in the atmosphere from NOx and VOCs, though cutting those pollutants can help limit ozone formation). So the best answer is the emissions most directly addressed: carbon monoxide and hydrocarbons.