<P> Nonpoint source (NPS) pollution is a term used to describe pollution resulting from many diffuse sources, in direct contrast to point source pollution which results from a single source . Nonpoint source pollution generally results from land runoff, precipitation, atmospheric deposition, drainage, seepage, or hydrological modification (rainfall and snowmelt) where tracing pollution back to a single source is difficult . </P> <P> Non-point 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 . Non-point 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 non-point source of pollution . Non-point 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 . </P>

Point sources and non point sources of pollution
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