Regulation
Principle, rule, or law designed to control or govern conduct. 
Continuing low-rate pollution of soils, sediments and 
aquifers presents a particular type of environmental problem.
Slow accumulation is difficult to detect over short time
spans. Gradually the pollution will spread into other compartments
and enter the food chains. Unlike hot spots, i.e. high levels
of contamination concentrated in small areas, such contamination
has little potential to result in acute problems. But due
to the large areas affected by this type of pollution, the
effects are as ubiquitary as its dispersion and have much
less possibility of dilution or compensation from adjacent
unaffected ares than hot spot pollution. If occuring at
a large scale, already moderate accumulation of xenobiotics,
metals or nutrients such as N, P, Ca, Mg, and S can seriously
disturb ecological processes and impair life-supporting
ecosystem functions, threaten the quality of food and fodder
products and result in long-lasting pollution of ground
and surface waters.
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