•Definition
– Pollution is defined as the presence of a substance which has a
detrimental effect upon the environment .
•Any
substance can be defined as a pollutant if a high enough concentration of it
is present in the environment. This is because any substance will
become toxic to the environment at high enough concentrations.
•
Some
substances are more inherently toxic than others. This means that the
concentrations that need to be present in order for a substance to be
defined as a pollutant can range from micrograms up to kilograms.
Sewage drainage from an open pipe into a small pond.
