Limiting the number of cars on the roads Switching to wood stoves for home heating Requiring large vehicles to use diesel fuel Maintaining filters in large buildings
I gave my students this multiple choice question: Which of these would most likely improve the air quality in large Texas cities?

Only one answer is correct among these 4 choices:
- Limiting the number of cars on the roads
- Switching to wood stoves for home heating
- Requiring large vehicles to use diesel fuel
- Maintaining filters in large buildings

Could you tell me which one is correct?

Limiting the number of cars on the roads