Chemistry
Grade-6
Easy
Question
Which of the following are the major causes of air pollution?
(i) 
(ii) 
(iii) 
(iv) 
- Only (i) and (ii)
- Only (i) and (iv)
- Only (ii)
- Only (iii)
Hint:
The presence in or introduction into the air of a substance which has harmful or poisonous effects.
The correct answer is: Only (i) and (ii)
The major cause of air pollution is Industries and automobiles.
As they both are in regular use and cause air pollution on regular basis. while on the other hand construction only cause dust particles in the air, not toxic gases. an eruption of volcanic is not regular.
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