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ow are the pollutant categorised on the basis of their existence in nature? Give two examples of each category.
Answers
Answer:The nature and concentration of a pollutant determine the severity of its detrimental effects on human health. Impurities released directly from the source of origin are known as primary pollutants, for example, CO2, SO2, NO. When contaminants like HC, NO, O3, combine in the atmosphere (moisture, sunlight) to form new products like PAN (Peroxyacetyl Nitrate), petrochemical smog, formaldehyde, which are known as secondary pollutants.Pollution is defined as the existence of impurities or pollutant substances in sufficient concentration levels, causing harmful effects on human beings, animals, plant life or material resources when exposed for a sufficient duration of time, thus reducing the quality of life in the environment.
From an ecological perspective, pollutants can be classified as degradable, slowly degradable and non-degradable. The Degradable or called as non-persistent pollutants can be rapidly broken down by natural process. For example domestic sewage, discarded vegetables, Slowly-degradable or persistent pollutants are pollutants that exist in the environment for many years in a stable condition and take decades or longer to degrade.
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