Answer:
Dust is a pollutant because
(i) Dust consists of suspended particles. Inhalation of
dust causes lots of discomfort including allergic asthma, bronchitis, cold or
cough.
(ii) It reduces intensity of light.
(iii) Dust particles settle over leaf and can block
stomata and reduce gaseous exchange in plants.
(iv) It causes irritation of eyes.
(v) Dust particles reduce the photosynthetic activity of
plants.
(vi) It contains smoke, fly ash, particle of silica, lead,
asbestos, etc., which pollute environment.
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