The steel with low oxygen content is the main new product of iron and steel factories, especially gear wheel and gas vase steel which demandoxygen conten relatively.
Sulfur dioxide emissions and chemical oxygendemand kept falling, down 5.95% and 4.42% respectively, and this trend became more firmly set.
二氧化硫、化学需氧量排放量减少的势头得到巩固，全年分别下降5．95％和4．42％。
3
According to the study agriculture is responsible for 43.7% of the nation's chemical oxygendemand (the main measure of organic compounds in water) 67% of phosphorus and 57% of nitrogen discharges.