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Observe the picture given in figure carefully and answer the following questions.
Crowded crossroad
(a) What is covering the nose and mouth of the police man?
The traffic policemen has covered his nose and mouth with a .
(b) Why is he putting a cover on his nose?
The traffic policemen covers his nose to emitted by the vehicles. These may enter the body through .
(c) Can you comment on air quality of the place shown in the figure?
In the figure, the air quality is . Due to the emitted by the automobiles along with the air is .
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