A) $ NO_2 $ does not play any role in photochemical smog
B) $ SO_3 $ is more harmful air polluntant than $ SO_2 $
C) $ SO_2 $ dos not affect larynx (voice box)
D) NO is more toxic to living tissues than $ NO_2 $
Correct Answer: B
[b] $ SO_3 $ is more harmful pollutant than $ SO_2 $ .
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