Aerosols and the ozone layer
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- Category: Issue no. 09
The steady concentration of ozone in the stratosphere depends on the balancing processes of the formation and destruction of ozone.When ultraviolet light strikes a molecule,ozone is formed. In nature,this is a slow process with a regeneration half-time of three to four years. In the lower atmosphere,ozone is formed when oxides of nitrogen and hydrocarbons emitted from motor vehicles,power plants and other sources come together in presence of sunlight and water vapour. Ozone(O3) readily absorbs ultraviolet light and dissociates into O2 and o. The stratosphere is one of the middle layers of the atmosphere that starts some ten miles above the Earth’s surface and extends to a height of about 30 miles.
