Three oxygen atoms when bound together forms ozone (O 3 ). It is very unstable and highly reactive relative to oxygen and often used as a bleach, a deodorizing agent, and a sterilization agent for air and drinking water. Ozone can be ‘good’ or bad for health and the environment depending on the place of its occurrence. Stratospheric ozone( at an altitude of 25-30 Km) is good because where it is found naturally and acts as a protective radiation shield for living organisms on earth. It strongly absorbs ultraviolet light in the region 220-330 nm and thereby protects life on earth from severe radiation damage. Ozone found in tropospheric region is termed as bad ozone or ground level ozone. When nitrogen oxides (NO x ), volatile organic compound (VOCs) (emitted by cars, power plants, refineries, chemical plants etc.) and sunlight reacts together to form various secondary pollutants, which are also known as photochemical oxidants. One of the most abundant photochemical oxidants is ozone
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