‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide – McqOptions

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1.	‘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____________________?
A.	Industrial chimney exhaust
B.	Automobiles exhaust
C.	Photochemical reaction in polluted atmosphere
D.	Burning of domestic fuel
Answer» C. Photochemical reaction in polluted atmosphere

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