Atmospher forms

The atmosphere forms a protective shell over the Earth.The lowest layer or the troposhere,the only part warm enough for us to surive in,is only 12km thick and contains a layer of sultfates ,which is important for the formation of rain.It also contains a layer of ozone,whichabsorbs ulteravoilate (UV) light known to cause cancer ,and without which no life could exist on Earth .The atmosphere is not rain full in different parts of the Earth ,it is complex dynamic system;if its is disrupted,it affects all mankind .Most air populations have both global and regional effects.
Living creatures cannot survive without air even for a span of a few minutes.To continue to support life,the air must be kept clean.Many of the major pollutants of air are created by industrial units that release various gases ,such as carbon diioxide ,cabon monoxide and toxic fumes, into the air .The air is also polluted by burning fossil fue;s.The build-up of corbon dioxide,which is known as the 'greenhouse effect'in the atmosphere has led to the current global warming.The growing number of scooters,motorcycles,cars,buses and trucks ,which all run on fossil fuel (petrol and diesel),is a major cause of air pollution in cities and along the highways.
All pollution severaly affects human health;it leads to acute and chronic respiratory diseases,such as various lung infecions ,asthma even cancer.