Carpooling decreases the amount of cars used to travel to a place.
Ozone from cars creates smog.
Carpooling decreases the amount of smog in the air.
How can smog be reduced?
Options:
1) Burning fuel
2) Flying airplanes
3) air cools
4) evaporation
5) exercise
6) vaporization
7) Driving more cars
8) Carpooling