In Mexico City, the return of terrible smog

NPR – Last month, for the first time since 2005, Mexico City officials declared a Phase 1 smog alert. Based on license plate numbers, every car must be kept off the road one day a week and one Saturday a month through the end of June. Last week the pollution was so bad — more than twice acceptable levels — the city ordered even more vehicles off the streets.

http://www.npr.org/sections/parallels/2016/04/13/474098405/in-mexico-city-the-return-of-terrible-smog

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