📊 Environmental Engineering
Q. '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
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✅ Correct Answer: (B) Automobiles exhaust

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