Discussion
Air contains \( 50 \) parts per million of carbon monoxide. At equilibrium the carboxyhaemoglobin saturation is roughly \( 0.16 \) times the concentration in ppm, giving
Answer: C
Correct answer: 8 per cent
Apply the stated proportionality:
\[ 50\ \mathrm{ppm} \times 0.16 = 8\ \mathrm{per\ cent\ carboxyhaemoglobin} \]
Eight per cent is a substantial internal dose - well above the 2 to 3 per cent at which effects on exercise capacity and cardiovascular function become detectable, and enough to cause headache and impaired judgement. The relation holds at equilibrium, which takes several hours to reach, so a short exposure at 50 ppm would give less.
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