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HONG KONG, Feb. 21 (Xinhua) -- Zhang Xiaoming, director of the Liaison Office of the Chinese Central People's Government in Hong Kong, on Thursday urged the Chinese mainland and Hong Kong to make concerted efforts to boost mutual respect and trust and deepen exchange and cooperation between the two regions.

The National Meteorological Center (NMC) has introduced a three-tier color-coded weather warning system to alert the public to the severity of smog. The system uses yellow to imply moderately smoggy weather, orange for severe conditions and red for extremely severe levels of smog.

The country has made a series of technological breakthroughs in constructing high-speed railways and in other major fields such as heavy-duty and high-latitude rail transport, the unidentified official said on the sidelines of Modern Railways 2012, an international railway exhibition hosted by the ministry and opened on Tuesday in Beijing.

BEIJING, Nov. 18 (Xinhua) -- Chinese State Councilor Ma Kai on Sunday met with visiting Comptroller General of the United States Gene L. Dodaro.

Cities suffering heavy air pollution that is 30 percent above the national standard or higher should try to meet standards by 2030, and cities between the previously mentioned categories are expected to meet the standards by 2020.