What is a pollutant ?
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Pollutants are toxic and otherwise harmful substances that have an undesirable impact on the different components of the environment and life forms.
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Name any two :
(a) natural sources of atmospheric pollution.
(b) gases which are responsible for the formation of acid rain.
(c) particulate pollutants.
What do you understand by ozone depletion ?
What do you understand by ppm ?
State an advantage of CNG (Compressed Natural Gas).