Does anyone know the level at which Carbon Monoxide renders unconsciousness and becomes deadly?

Carbon monoxide concentrations and symptoms


35 parts per million (ppm) = No adverse effects within eight hours


200 ppm = Mild headache after two to three hours of exposure


400 ppm = Headache and nausea after one to two hours


800 ppm = Headache, nausea and dizziness after 45 minutes; collapse after two hours


1000 ppm = Loss of consciousness after one hour


1600 ppm = Headache, nausea and dizziness after 20 minutes; unconsciousness after 30 minutes


3200 ppm = Headache, nausea and dizziness after 5-10 minutes; unconsciousness after 30 minutes


12,800 = Immediate physiological effects; unconsciousness and danger of death after only one to three minutesDoes anyone know the level at which Carbon Monoxide renders unconsciousness and becomes deadly?
carbon monoxide is deadly at .5 milligrams. the same level as cyanideDoes anyone know the level at which Carbon Monoxide renders unconsciousness and becomes deadly?
At high levels (CHOb of 50% or more) there may be unconsciousness and death.
That would depend on several factors, including the person's weight, metabolic rate, rate of ventilation in the space, and the existence of a pre-existing condition or disease.





However, a concentration of as little as 0.04% (400 parts per million) carbon monoxide in the air can be fatal.