Tolerable concentration of toxic carbon monoxide in atmospheric air is about ______________ ppm?
Correct answer: A. 50
- A. 50
- B. 1000
- C. 5000
- D. 10000
Explanation
About 50 ppm is the commonly quoted tolerable upper concentration for carbon monoxide in air. Higher concentrations can rapidly impair oxygen transport in the blood because CO forms carboxyhaemoglobin.
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