'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in – 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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