One possible version：

Car-free Day was launched in our city and 107 other cities on September 22， to encourage people to take public transport， ride bicycles or walk instead of driving private cars。

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The campaign has gained much support all over the country and has raised awareness among all people of energy saving and environmental protection。 It"s a real success。

With the development of the economy， more and more families have bought private cars， thus leading to much heavier traffic problems and more serious air pollution。 Therefore， I think it"s necessary to launch such campaigns。 And I hope more and more cities and their residents will take part in this type of activity