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Michael Punke, Deputy U.S. Trade Representative and U.S. Permanent Representative to the WTO, said a central pillar of U.S. trade policy is the commitment to open markets and to the rules-based multilateral trading system embodied in the WTO.

Lingering cold along with freezing rain and snow have caused to the province direct economic losses estimated at over 77.76 million yuan (about 12.51 million U.S. dollars), mostly coming from agricultural fields.

"As more than one third of the flights make a stopover in Beijing Capital International Airport during the night, our travel agencies will develop some night entertainment programs for the tourists," Sun added.

According to the Beijing Municipal Air Pollution Control Regulation draft released by the municipal government, a certain number of vehicles will have to be off the road during heavy air pollution in order to protect the health of people in the city.

PM2.5 refers to fine particulate matter 2.5 microns or less in diameter, while PM10 refers to particulate matter 10 microns or less in diameter.