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Question
'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the
Options:
A .  industrial chimney exhaust.
B .  automobiles exhaust.
C .  photochemical reaction in polluted atmosphere.
D .  burning of domestic fuel.
Answer: Option B
Answer: (b).automobiles exhaust.

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