Air quality declines, because you increase the number of cars capable of being on the road at the same time. Same with lowering gasoline prices. Make car riding easy, gas-burning increases.
Not so much. Most air-quality problems are caused by cars idling in traffic - the amount of driving people do isn't very elastic, while the amount of fuel burned to get to a given destination can rise dramatically if you spend 80% of the journey not moving.
As for a "better" lfe - first, dump the car. It makes you fat, makes your country go to war repeatedly to protect the oil,
Fuck you hippie. Shave that neckbeard, get a job, buy a car, and then you'll see. Then die in a fire, you fucking hippie.
P.S. Fuck you, you fucking hippie.