By Weather.com- Mar 2, 2013-Associated Press
Beijing's skyline is seen on Feb. 19, 2013 in the top photo. The skyline photo on the bottom was taken on Thursday, Feb. 28, 2013.
Air pollution levels went off the charts in Beijing and parts of northern China on Thursday when strong winds blew a dust storm across the region.
The air, which became a noxious blend of smog and dust, began to clear by midday.
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