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China has issued its clean production evaluation systems for six industries amid efforts to curb air and water pollution.

The National Development and Reform Commission Thursday published on its official Website the systems for sectors including cement, fermentation, soda ash, machinery, sulphuric acid and leather.

The six sets of standards became effective on the day of issuance on a trial basis in a bid to help better use of natural resources and cut pollutant emissions, said the commission.

The standards will be revised with the economic development and improvement of technology, according to the commission.

China has committed itself to improving energy efficiency -- its goal is to cut energy consumption per unit of gross domestic product (GDP) by 20 percent and major pollutant emissions by 10 percent by 2010.

Energy consumption per unit of GDP fell 1.33 percent year-on-year in 2006, only one third of its four-percent target, official figures showed.