768Chemical EngineeringMedium
‘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________?
AAutomobiles exhaust
BBurning of domestic fuel
CPhotochemical reaction in polluted atmosphere
DIndustrial chimney exhaust
Correct answer
A. Automobiles exhaust
Explanation
The correct answer is Automobiles exhaust.