Please choose the correct answer to the question: Many cars are equipped with a catalytic converter, a device that helps remove hydrocarbons and oxides from car exhaust. As a result, this device helps to

Answer1: increase the production of ozone. Answer2: decrease the production of smog. Answer3: increase the emission of nitrogen. Answer4: decrease the emission of carbon dioxide.

Answer format: answer1/answer2/answer3/answer4