Industrial enterprises, vehicles and sources from outside Shanghai are the cause of 80 percent of the city's air pollution, the local environment monitoring center said.

Based on samples collected over the past two years, the environmental watchdog found that emissions from industrial plants in Shanghai generated 32.9 percent of the city's air-borne pollutants, and those from motor vehicles, ships and planes accounted for 25.8 percent of the pollutants, according to figures released on Monday.

Dust, cooking and the agricultural sector generated 19.8 percent of air pollutants. The remaining 21.5 percent came from outside Shanghai.