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2014-11-12 Wed 02:51
Chinese authorities have asked sites and apps which monitor air pollution in Beijing to stop using data provided by the US embassy, say media reports.
Beijing is currently hosting a high-profile gathering of world leaders from the Asia-Pacific bloc of countries.
In an attempt to have clearer skies for the summit, factories have been shut down and cars barred from the roads.
Many Beijingers use apps and sites to check pollution readings, including levels of dangerous PM2.5 particles.
The city, which is often engulfed in a thick blanket of haze reaching well beyond healthy levels, had clear blue skies for the days leading up the summit.