出典:Wikipedia
出典:『Wikipedia』 (2011/05/19 09:21 UTC 版)
Nonpoint source (NPS) pollution refers to both water and air pollution from diffuse sources. Nonpoint source water pollution affects a water body from sources such as polluted runoff from agricultural areas draining into a river, or wind-borne debris blowing out to sea. Nonpoint source air pollution affects air quality from sources such as smokestacks or car tailpipes. Although these pollutants have originated from a point source, the long-range transport ability and multiple sources of the pollutant make it a nonpoint source of pollution. Nonpoint source pollution can be contrasted with point source pollution, where discharges occur to a body of water or into the atmosphere at a single location.