6 September 2015. In Beijing, China banned 2.5 million cars from driving for 2 weeks to get this beautiful blue sky for a World War II commemorative parade. As soon as the parade was over, the ban was lifted, and the blue vanished within 24 hours.

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http://boingboing.net/2015/09/04/this-is-how-blue-the-skies-wer.html

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