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Table 1 Reference Carbon Monoxide levels in humans and various environmental sources

From: Effects of chronic carbon monoxide exposure on fetal growth and development in mice

Subject/Source CO level Source
Non smoker 0-1.5% COHb [10]
Smoker Up to 14%COHb [11, 12]
Natural urban air level 1-30 ppm [15]
Levels found in homes 0.5- 5 ppm [42]
Cigarette Smoke 20 000-60 000 ppm [15]
Alveolar Concentration in smoker 300-400 ppm [15]
Car Exhaust without catalytic converter 30 000- 60 000 ppm [15]
  1. *Parts per million (ppm) by volume (100 ppm = 0.01% of CO in the air)
  2. *Percent carboxyhemoglobin (%COHb) is the amount of CO bound to total haemoglobin