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 in eyes.
(v) Dust particles reduce the photosynthetic activity of
plants.
(vi) It contains smoke, fly ash, particle of silica, lead,
asbestos, etc., which polluted environment.
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