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:Slovak term: [[Slovenský termín]]
# A pollution input that cannot be related to a single outlet (UNEP et al. 1997)

==Explanation==
Non-point sources arise mainly from agriculture, but urban road run-off, effluents from
contaminated land and effluents from storm sewage overflows are also known to contribute
to the problem. In some countries the latter would be classified as point sources although
they are difficult to control.

It is more difficult to control non-point source pollution than defined discharges. Even
though stringent controls may be placed on industrial and municipal sewage discharges,
environmental water quality may not improve to the extent expected. This may be due to
diffuse pollution caused by agriculture or by urban run-off. The first problem lies in the
identification of sources (UNEP et al. 1997).

==Example==
'''Classes of non-point source pollution (highlighted categories refer to agricultural
activities)''' (Source: International Joint Commission, 1974, and other sources)FAO (1995)
Control of water pollution from agriculture

==References==
* UNEP, Water Supply & Sanitation Collaborative Council and WHO (1997) [http://www.who.int/water_sanitation_health/resources/watpolcontrol/en/index.html Water pollution control: a guide to the use of water quality management principles]
* FAO (1995) [http://www.fao.org/docrep/W2598E/w2598e04.htm Control of water pollution from agriculture]

==Links==
* [http://apps.who.int/thelexicon/ WHO — The Health and Environment Lexicon]

[[Category:EN]]

Non-point source pollution - História úprav

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