Hebei, a northern region with the worst air in China, has shut down 8,347 small high-polluting firms in the past year in an attempt to ease its notorious air pollution, new data has showed.

According to statistics published monthly by the Ministry of Environmental Protection, Hebei is home to as many as seven of the country's 10 most polluted cities.

The province faces an enormous challenge as its air pollution is a source of public complaints and anger not only locally, but also in neighboring regions like Beijing.

Severe smog hit Beijing, Tianjin and almost all major cities in Hebei on Thursday, with readings of PM 2.5, small airborne particles posing the biggest health risk, exceeding or nearing 500.

Yang Zhiming, deputy director of the Hebei provincial bureau of environmental protection, told a press briefing on Thursday that the agency will beef up the industrial crack-down as some small high-polluting plants are being relocated to remote areas to avert supervision.

Among 33,000 pollution sources in Hebei, many small high-polluting firms are located in townships or the countryside, often blind spots for the regulators, Yang admitted.

Meanwhile, some small refiners, leather makers and electroplating factories are moving to more remote countryside and some are even operating within the disguise of corn fields, he said.

Small firms often secretly emit pollutants, causing severe pollution to surrounding regions and thus triggering the majority of China's around 10,000 pollution-related petitions annually, he added.

Local authorities will block new projects and punish officials in regions where pollution is not alleviated due to loose supervision, according to the official.

Amid the efforts to boost supervision, the agency has recruited 10,298 volunteers to monitor pollution sources. Also it offers cash rewards to whistleblowers.

Hebei's economy is dominated by highly polluting and energy-guzzling heavy industries, which contribute up to 77 percent of all emissions into the air, official data showed. Hebei has the largest steel capacity of all China's regions.

The local government has pledged to cut annual steel and cement production capacities by 60 million tonnes respectively by 2017 and to reduce annual coal consumption by 40 million tonnes from 2012 levels within the same time frame.

The Chinese central government is becoming more serious in tackling pollution as the choking air has become the target of growing discontent among urban residents.

In September, the State Council, or the Cabinet, signed air pollution control initiatives with six provinces and municipalities in north China, including Beijing, Tianjin, Hebei, Shanxi, Inner Mongolia and Shandong, in a coordinated effort to tackle smog.

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