Fact 1: Carpooling decreases the amount of cars used to travel to a place.

Fact 2: Ozone from cars creates smog.

Given the two facts above, answer the question "How can smog be reduced?" with the following options: 
- Burning fuel
 - Flying airplanes
 - air cools
 - evaporation
 - exercise
 - vaporization
 - Driving more cars
 - Carpooling


 

        Carpooling 