Please choose the correct answer to the question: Many states require vehicles to be examined and to meet safety and pollution standards. What impact might vehicle inspections have on the environment?

Answer1: The environment will not be polluted. Answer2: The environment will become more polluted. Answer3: Fewer pollutants will be released by vehicles. Answer4: Fewer pollutants will be produced by older vehicles.

Answer format: answer1/answer2/answer3/answer4