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PM10 was previously used as part of the country's air quality standards before being replaced by the PM2.5 index, which measures finer particles that are considered more hazardous to health than larger ones.

"The trend is to introduce foreign investment into the shale gas industry. But as this is a completely new sector, authorities need time to figure out how," said Lin Zong, a researcher at the Development and Research Center of the China Geological Survey.?

The China Meteorological Administration (CMA) said from Saturday sleet and snow will fall in parts of Xinjiang, Tibet, Qinghai, Gansu, Shaanxi, Inner Mongolia, as well as north China and regions along the Yellow and Huai rivers.

Twenty-five inbound flights from cities such as Beijing, Dalian and Chengdu to Urumqi have been diverted to nearby alternate airports as heavy fog disrupted air traffic over the Urumqi International Airport from 11:45 a.m., the airport control center said.

A 2008 scandal in which milk was laced with melamine led to the deaths of at least six babies and sickened 300,000 others in the Chinese mainland.