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Mexico ____________________ , the capital of ____________________ , has some of the worst ____________________ pollution of any major city on Earth . The ____________________ comes from the city's low ____________________ and the energy and transportation requirements of its nearly 9 ____________________ residents . Between the ____________________ and ____________________ power plant emissions and vehicle
exhaust , Mexico City's air quality is extremely ____________________ . Air ____________________ flags are flown daily to designate the smog levels , particularly in the dry winter months .


In an effort to ____________________ its air pollution problem , Mexico City ____________________ the number of days its citizens are ____________________ to operate their personal motor vehicles . Mass transit systems , such as the city's ____________________ and train networks , are encouraged as an alternative means of transportation

* * * Adapted from the Georgia Deparment of Education 6th Grade Social Studies Teacher Notes for the Georgia Standards of Excellence in Social Studie s