What can big cities do to improve their air quality?

According to the Encyclopedia of Earth ( http://www.eoearth.org/article/Air_quality_in_megacities ) “in most urban areas, emissions from increasing number of automobiles are a major contributor of harmful pollutants” but automobiles aren’t the only reason for poor air quality in big cities. What can we do as concerned citizens to improve air quality and improve our environment?

free public transportation

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