Diffused matter suspended floating in the air and impairing its transparency
A.
B.
C.
D.
Answer & Solution
Solution:
Smog refers
to a mixture of smoke and fog that reduces air quality and transparency.
Vapor (A)
refers to gas-like water, which is not necessarily suspended in the air to
impair transparency.
Substance
(B) is too broad a term and doesn't describe air pollution.
Cloud (D) is a collection of water droplets or ice crystals in
the atmosphere but doesn’t necessarily impair transparency in the same way as
smog.
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