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The Pearl River in southern China passes through the provinces of Yunnan, Guizhou, Guangxi and Guangdong. The river delta area is the country's key manufacturing hub.

Remarkable achievements have been made in bilateral cooperation in biology, information, mining, laser, new materials and other fields, making science and technology a priority and bright spot in the China-South Africa comprehensive strategic partnership, said Liu.

He also said that the upcoming meeting between the two heads of state is of great importance to the future development of bilateral ties, adding that the U.S. side will exert all efforts to prepare for the meeting and is willing to work with the Chinese side to make sure that the meeting can produce positive results.

According to the city's air quality surveillance center, except the southern Daxing District, air quality was "excellent" or "good" as of 10 a.m. Sunday. The density of PM 2.5 was less than 100 micrograms per cubic meter.8 Smog has become north China's biggest environmental issue in recent years, particularly in winter, when coal-fired heating boilers rev up and the wind drops. Despite drops in pollution indicators, smog still occurs frequently.

Violating electrical installation provisions, careless use of fire and smoking were the top three causes of the disasters, it said.