The environment will not be polluted. The environment will become more polluted. Fewer pollutants will be released by vehicles. Fewer pollutants will be produced by older vehicles.
I gave my students this multiple choice question: Many states require vehicles to be examined and to meet safety and pollution standards. What impact might vehicle inspections have on the environment?

Only one answer is correct among these 4 choices:
- The environment will not be polluted.
- The environment will become more polluted.
- Fewer pollutants will be released by vehicles.
- Fewer pollutants will be produced by older vehicles.

Could you tell me which one is correct?

Fewer pollutants will be released by vehicles.