text: One of the more obvious advantages of limiting car usage is the amount of emission that can be prevented from not using your car. In Source 2 it is stated that after 5 days of limiting car usage "the smog cleared enough Monday for the ruling French party to rescing the ban for odd-numbered plates on Tuesday." After just five days of the imposed fines, gas emissions into the atmosphere was reduced significantly enough to lift the ban. If five days made such an impact it can also make a huge impact if many more people were to start limiting their car usage. Car usage has already been falling in the United States. In source 4 it states that "New York's new bike sharing program and its skyrocketing brdge and tunnel tolls reflect those new priorites, as do a proliferation of car-sharing programs across the nation." This is talking about how all these factors have come to reduce car sales and car usage in general. Less cars equals less gas which would then equal less air pollution.