Pollution can be classified into the three types Those substances that occur in nature but as a result of human activity are found in unusually large concentration e.g. excess CO2 in the atmosphere, increased concentration of phosphate and nitrates in freshwater aquatic system etc. Toxic substances that are not found ii nature. e.g. pesticides. Such unnatural substances often remain intact in the environment for considerable lengths of time before being broken down or are dispersed. Substances which are not themselves toxic released into the environment as a result of human activity but will go on to have unfortunate consequences. e.g. effect of certain substances like CFC on the ozone layer.
Posted on: Thu, 14 Nov 2013 02:14:35 +0000
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