SHANGHAI (Reuters) - The smog-prone northern Chinese province of Hebei has drawn up plans to launch a comprehensive environmental protection tax starting in the new year that will give more incentives for local polluters to clean up, it said on Wednesday.

People wear face masks as heavy smog blankets Shenfang in Hebei province, on an very polluted day December 20, 2016. REUTERS/Damir Sagolj

China’s legislature approved a new environmental tax law late last year that gave regions the power to set their own rates. Several regions have already drawn up schemes and in January will start charging firms according to the amount of air, water and even noise pollution they produce.

But Hebei, a major source of hazardous and politically embarrassing emissions drifting across China’s capital Beijing, is under heavy pressure to clean up and will levy higher rates of tax than other regions.

According to draft regulations now being discussed by local lawmakers, firms in the cities of Shijiazhuang, Baoding, Langfang and Dingzhou will be charged as much as 6 yuan ($0.91) for each unit of air pollution and 7 yuan for each unit of water pollution they produce, the local government said.

The highest permissible rate stands at 12 yuan and 14 yuan respectively, according to the law passed last year.

Cities and counties directly bordering Beijing will be forced to pay even higher rates, with major air pollutants like sulphur dioxide and nitrogen oxides charged at 9.6 yuan per unit. Major water pollutants like ammonium nitrate will be levied at 11.2 yuan per unit.

Units are calculated based on coefficients that assign weights to different pollution sources. A single unit is the equivalent of 16.7 kilograms of carbon monoxide or 0.95 kilograms of sulphur dioxide.

Neighbouring Shanxi province, China’s biggest coal producing region, also said this week that it would introduce a environmental protection tax starting from Jan. 1, 2018, with polluters paying 1.8 yuan per unit of air pollution and 2.1 yuan per unit of water pollution.

The province said it expected the new tax to raise 1.9 billion yuan next year, with the figure likely to decline steadily as firms gradually cut their emissions.

(This version of the story changes ‘carbon dioxide’ to ‘carbon monoxide’ in paragraph 7)