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BEIJING, Jan. 29 (Xinhua) -- China's meteorological authority has introduced a new weather warning system for smog which will use readings of PM 2.5, a particle pollutant.
"Most countries in these regions have applauded the project," the statement said.
Snow continued into Monday night and staff at the Urumqi International Airport were cleaning the runways, an airport statement said.
On Sunday, 4,193 trains were employed, including 109 temporary trains, with the Beijing and Shanghai railway bureaus registering 222,000 and 504,000 passenger trips, respectively, the ministry said.
China's estimated number of Internet users mushroomed to more than 538 million as of June this year from about 620,000 in 1997, statistics from the China Internet Network Information Center (CINIC) showed.
来源：资阳报