sentence: People are becoming more and more aware of the strain the carbon dioxide emissions of their cars put on the environment , and many municipalities have already outlawed the circulation of certain types of vehicles in given parts of their cities to reduce atmospheric pollution and improve the quality of its air .
modified: People are becoming more and more aware of the strain the carbon dioxide emissions of their cars put on the environment , and many municipalities have already outlawed the circulation of certain types of vehicles in given parts of their cities to reduce atmospheric pollution and improve the quality of its air .
transformation: noop