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'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. [Wrong Answer] |
B. | automobiles exhaust. [Correct Answer] |
C. | photochemical reaction in polluted atmosphere. [Wrong Answer] |
D. | burning of domestic fuel. [Wrong Answer] |