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Douglas W. Dockery

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Air quality in Mexico City is influenced by the bowl-like valley it sits within, surrounded by pollution-trapping mountains like those in this 47-story view (photo 1). Heavy traffic accounts for most of the air pollution in this megacity of 22 million residents (photo 2). Yet it also has the largest bike-sharing program (photo 3) in Latin America — one of many attempts to improve the city’s environment and quality of life.

Coming up for air

Mexico City, Harvard alliance to study health changes after two decades of major environmental upgrades