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
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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