Table 1

Reference Carbon Monoxide levels in humans and various environmental sources

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]


*Parts per million (ppm) by volume (100 ppm = 0.01% of CO in the air)

*Percent carboxyhemoglobin (%COHb) is the amount of CO bound to total haemoglobin

Venditti et al. BMC Pregnancy and Childbirth 2011 11:101   doi:10.1186/1471-2393-11-101

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