To its residents who still have a sense of smell, Mexico City is redolent with the perfumes of exhaust and ozone. The metropolis’s air pollution levels routinely rocket past the World Health Organization’s maximum limits, leaving people sick in their wake. Vehicles are the most generous contributors to the city’s acrid cloak, chortling forth 99 percent of the carbon monoxide, 81 percent of the nitrogen oxides, and 46 percent of the volatile organic compounds in the atmosphere, according to...

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