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Zhang said an initial investigation showed that a dense buildup of carbon monoxide in the mine was caused by self-igniting coal in an old mine located adjacent to the Yongsheng mine.
Tourists holding third country visas and plane tickets can now apply for a transit without visa at Beijing's international airport. Foreign visitors are not permitted to leave Beijing to other Chinese cities during the 72 hours, and have to depart from the capital city.
The EfD initiative has centers in South Africa, Tanzania, Kenya, Ethiopia, China, Sweden, the United States, Chile, and Central America.
A second-class coach fare from Beijing to Guangzhou is 865 yuan (138 U.S. dollars), and the cheapest air ticket for Dec. 26 costs only 25 yuan more, 493 yuan lower than first-class coach tickets.
The Beijing Youth Federation has also joined the campaign against the use of firework, saying that although the smog "has been blown away, our fate can not simply depend on the wind."
