China tells US to stop tweets on Beijing's bad air

PM2.5 are believed to be a health risk because they can lodge deeply in the lungs, and have been linked to increased cardiovascular and respiratory diseases as well as lung cancer.

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Associated Press writer Gillian Wong in Beijing and Matthew Pennington in Washington contributed to this report.

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Online:

U.S. Embassy Beijing air quality monitor: https://twitter.com/(hashtag)!/BeijingAir

U.S. Consulate Guangzhou air quality monitor: https://twitter.com/(hashtag)!/Guangzhou_Air

U.S. Consulate Shanghai air quality monitor: https://twitter.com/(hashtag)!/cgshanghaiair

Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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