Apoint source of pollution is a single identifiable source ofair,water,thermal,noise orlightpollution. Apoint source has negligible extent, distinguishing it from other pollution source geometrics (such asnonpoint source orarea source). The sources are calledpoint sources because in mathematical modeling, they can be approximated as a mathematicalpoint to simplify analysis.^[1] Pollution point sources are identical to otherphysics,engineering,optics, andchemistry point sources and include:

• Air pollution from an industrial source (rather than an airport or a road, considered aline source, or a forest fire, which is considered an area source, orvolume source)^[2]
• Water pollution from factories, power plants, municipalsewage treatment plants and some farms (seeconcentrated animal feeding operation).^[3] The U.S.Clean Water Act also defines municipal separatestorm sewer systems and industrialstormwater discharges (such asconstruction sites) as point sources.^[4]
  • Man-made, natural, andgroundwater reservoirs can all be contaminated by point source pollution which can threaten human health and safety.^[5]
• Noise pollution from ajet engine^[6][7]
• Disruptiveseismic vibration from a localized seismic study^[8]
• Light pollution from an intrusivestreet light^[9]
• Radio emissions from an interference-producing electrical device

• Nonpoint source pollution
• United States regulation of point source water pollution

• Pollution
• Transboundary environmental issues

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