Q. Consider the following statements about Carbon Monoxide (CO):
  1. It is an indoor pollutant
  2. It is more soluble in blood than in water
  3. It is less dense than air
Which of the above statements is/are correct?

Answer: 1, 2 & 3
Notes:
  1. Carbon monoxide is a major indoor air pollutant as it can be released by faulty/improper combustion of fuels indoors.
  2. Carbon monoxide is about 210-250 times more soluble in blood than in water. This allows it to bind to hemoglobin in blood.
  3. Carbon monoxide is lighter and less dense than air.