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.
State two effects of ozone depletion.
What do you understand by ppm ?
State an advantage of CNG (Compressed Natural Gas).