Answer:
(i) Since the city was
built on marshy land, the resulting fog combined with smoke, and generated a
thick black smog.
(ii) High
levels of pollution was due to the huge population that used dung and wood as
fuel in their daily life.
(iii)
Main pollutants were the industries and establishments that used steam engines
run on coal.
(iv) Rice
mills of Tollygunge began to burn rice husk instead of coal, leading to black
soot which fell like drizzling rain.
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