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51. Write a note on working of electrostatic precipitator.

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52. How does a scrubber function ?

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Differences between primary air pollutants and secondary air pollutants

Primary air pollutant

Secondary air pollutant

1. Pollutant persists in the form in which it is released in the environment.

2. Example. Glass, D.D.T., Carbon monoxide, Nitrogen oxide, Hydrocarbons.

1. It is formed due to the reaction of primary pollutants in the atmosphere.

2. Example. Ozone, Peroxyacyl nitrate (PAN)

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54. What is photochemical smog ? How does smog affect biological world ?

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55. What is acid rain ? What are its effects on plants ?

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56. What measures do you suggest to control pollution from automobile exhaust ?

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57. Briefly explain noise pollution.

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58. List various measures for control of noise pollution.

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59. What is water pollution ?

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60.

Make a chart illustrating the kinds of water pollutants.

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