Sulphur dioxide

The pH of natural rain is found to be in the range from 5 to 7.  The term acid rain is customarily applied to precipitation with a pH below 5. Such low pH values are generally possible only in the presence of large amounts of anthropogenic pollution. Sulphuric acid and nitric acid is considered as the principal agents responsible for acid rain. But the major culprit are human beings. Smokes emitted from the industries is the major source of sulphur dioxide whereas smokes emitted from the motor vehicle is the major source of nitrogen oxide. These emissions mixed with atmospheric ... Read more

ENVIRONMENT POLLUTION defined as ‘an addition or excessive addition of certain materials to the physical environment (water, air and lands), making it less fit or unfit for life’. Pollutants are the materials or factors, which cause adverse effect on the natural quality of any component of the environment. Classifications 1. According to the form in which they persist after release into the environment. • Primary pollutants: These persist in the form in which they are added to the environment e.g. DDT, plastic. • Secondary Pollutants: These are formed by interaction among the primary pollutants. For example, peroxyacetyl nitrate (PAN) is ... Read more