text: Limiting car usage also helps the environment and ozone. In Paris there was a lot of smoge for days and they had to take action. "After days of near record pollution, Paris enforced a partial driving ban to clear the air of the global city.", states Article two. After this ban the smog cleared a few days later. This shows how easily car can pollute the air and the environment. In Article four it states, "Since transportation is the second largest source of America's emissions, just behind power plants.". Cars are one of the main reasons for the environment being polluted and it can be stopped easily if people car-pooled, rode their bikes or walked.