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Environment Book Summary Presented B Aartee Mishra
CHAPTER 5 ENVIRONMENTAL POLLUTION (Part-1)
ENVIRONMENTAL POLLUTION Pollution is 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 .Pollutants are the materials or factors, which cause adverse effect on the natural quality of any component of the environment. AIR POLLUTION Air pollution is aggravated because of four developments: increasing traffic, growing cities, rapid economic development, and industrialization
CLASSIFICATION OF AIR POLLUTANTS Air pollutants Based on states of matter Based on presence in environment Based on Origin Primary air pollutants Secondary air pollutants Indoor air pollutants Outdoor air pollutants Gaseous air pollutants Particulate air pollutants
Major air pollutants and their source Carbon monoxide (Co) It is a colourless gas that is produced by the in complete burning of carbon-based fuels including petrol, diesel, and wood It is also produced from the combustion of natural and synthetic products such as cigarettes. It lowers the amount of oxygen that enters our blood Carbon dioxide (C02) t is the principle greenhouse gas emitted as a result of human activities such as the burning of coal, oil, and natural gases. Chloroflorocarbons (CFC) .These are gases that are released mainly from air-conditioning systems and refrigeration.
. When released into the air, CFCs rise to the stratosphere, where they come in contact with few other gases, which lead to a reduction of the ozone layer that protects the earth from the harmful ultraviolet rays of the sun. Lead It is present in petrol, diesel, lead batteries, paints, hair dye products, etc. Lead affects children in particular. It can cause nervous system damage and digestive problems and, in some. cases, cause cancer Ozone It occurs naturally in the upper layers of the atmosphere. This important gas shields the earth from the harmful ultraviolet rays of the sun.