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Arthur T Knackerbracket has found the following story:

Decades ago Mexico City's air pollution was so poor, birds would fall out of the sky -- dead. Locals said living there was like smoking two packs of cigarettes a day, according to one report. In response, Mexico City took several steps to try to improve air quality including restricting driving one or two days during the weekdays. The program has had negligible results.

In 2008, the city added driving restrictions on Saturdays in hopes of moving the needle but according to new research by Lucas W. Davis, an associate professor at UC Berkeley's Haas School of Business, extending the program one more day also isn't working.

[...] To determine the impact of Saturday restrictions, Davis analyzed hourly air pollution data from 29 monitoring stations around Mexico City from 2005 to 2012. He studied emission levels for carbon monoxide; nitric oxide; nitrogen dioxide; nitrogen oxide; ozone; large particulates; small particulates; and sulfur dioxide. None of these pollutants decreased as a result of Saturday driving restrictions.

[...] "People have found other ways to get around the driving restrictions," says Davis. "Some purchase multiple cars, others take taxis or Uber."

[...] "Test every car, test every year. If you have a car that's polluting the air, you can't drive it. Period," says Davis.

-- submitted from IRC

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