Over half of the city’s waterways are heavily polluted, according to a newly released report by the local environmental authority.

The Shanghai Environment Monitoring Center tested 100 spots in the city and found only 10 percent of the waterways were either excellent or good quality. Sixteen percent were moderately polluted, and the remaining 65 percent were heavily polluted.

Water flowing in 24 heavily polluted waterways was reported to be dark and stinking.