Background Action Plan for Prevention and Control of Water Pollution,issued by the State Council of P.R.C.in 2015 "By 2020,the quantity of black and odorous water bodies in built-up areas in cities at prefecture level and above will be controlled within 10%and,by 2030, generally eliminated." 2100 。器 Number of investigated black and odorous water bodies in ChinaBackground Action Plan for Prevention and Control of Water Pollution, issued by the State Council of P.R.C. in 2015 “By 2020, the quantity of black and odorous water bodies in built-up areas in cities at prefecture level and above will be controlled within 10% and, by 2030, generally eliminated.” Number of investigated black and odorous water bodies in China