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 am hesitating between 4 options to answer the following question, which option should I choose?
Question: Many states require vehicles to be examined and to meet safety and pollution standards. What impact might vehicle inspections have on the environment?
Possibilities:
- 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.

Fewer pollutants will be released by vehicles.