Air pollution occurs when the air contains gases, dust, fumes or odour in harmful amount. That is, amounts which could be harmful to the health or comfort of humans and animals or which could cause damage to plants and materials. The substances that cause air pollution are called pollutants. Pollutants that are pumped into our atmosphere and directly pollute the air are called primary pollutants. Primary pollutant examples include carbon monoxide from car exhausts and sulfur dioxide from the combustion of coal.
Further pollution can arise if primary pollutants in the atmosphere undergo chemical reactions. The resulting compounds are called secondary pollutants. Photochemical smog is an example of this. In the days before the proliferation of large cities and industry, nature’s own systems kept the air fairly clean.
ABOUT THE AUTHOR M P Singh
Dr. M.P. Singh, Head of the Department of Forest Sciences, Birsa Agricultural University, Ranchi (Jharkhand) earned his mater's degree in Botany with specialization in Taxonomy and after his PH.D degree in Floristic from Patna University and Diploma in Forestry from Forest Research Institute, Indian Council of Forestry Research & Education, Dehradun. He is a fellow in Life Sciences of Mendelian Society of India, Patna. Besides teaching Dr. Singh has been engaged with independent research in Project of Government of India as Principal investigator. He is noted Taxonomist of the country and have about twenty one years of long experiences. He is an advisor to the Government of India for whole Eastern Region on Horistic research and member of FLORA INDIA. He is the Editor of Journal "New Botanist" for forestry sector. He has published eight books in Botany, Forestry and on Environmental Sciences and also published eighty five research papers in National/International Journals. He has also guided a number of Scholar for award of Ph. D. degree in Botany as well as in Forestry. He is one of the member of Botanical Survey of India in a Research Selection Committee. He has extensively travelled in India and abroad in conection to floristic studies.
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