中国多个城市发布"红色预警"

The new round of inspections follow checks that were made earlier this month, in which inspectors found several factories emitting large amounts of pollutants in the city of Xinxiang, during the air pollution alert period.

This time, the inspectors found Yubei Chemical Ltd, one of the companies that had failed to pass the last inspection, had suspended its production.

City official Li Zhongyao says steps are being taken to cut pollution at its source.

"We have drawn inferences about other cases from one instance and checked the city's enterprises one by one. We will resolutely rectify problems once we find them."

Various measures have also been carried out in northern and eastern China as heavy smog lingers.

Shandong Province has now issued its first-ever red alerts in four cities, after warning that the density of PM2.5 would exceed 400 micrograms per cubic meter for more than 24 hours.

The alerts take effect this morning, limiting the number of vehicles on roads while also banning fireworks and outdoor barbecues. All construction sites will be closed. People are told to reduce outdoor activity and schools are expected to suspend classes.

A blue alert covering the whole province of Anhui, where five cities have had air quality index readings over 200 since Tuesday, has also been issued.

Hebei, home to six of China's ten "most polluted" cities in November, issued red alerts on Tuesday at noon. Tianjin saw its first red alert the same day, just as Beijing lifted its second red alert.

The Tianjin alert will expire today.

Wang Zifa, a researcher from the Chinese Academy of Sciences, says issuing red alerts can help prevent pollutant clusters.

"During the continuous heavy pollution period, if we can issue the alert or carry out measures early enough, we can largely reduce pollutant accumulation and lower its speed in the entire area. Take Beijing for example, pollutant is like a snowball. As time goes by, the snowball becomes bigger and bigger. If we can issue the alert earlier, the accumulation of the snowball can be slowed down, and the pollution will be effectively eased."

On Wednesday, the Ministry of Environmental Protection gave a preliminary assessment of the effects of recent emergency measures.

According to the ministry, Beijing cut pollutant emissions by 30 percent during its second red alert and neighboring cities emitted 25 percent less compared with ordinary days.

The ministry also named three organizations for environmental protection violations, pledging intensified supervision and heavier punishment for violators.

For CRI, this is Min Rui.