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Many cases of reported Carbon Monoxide poisoning indicate that while victims are aware they are not
well, they become so disorientated they are unable to save themselves by either leaving the building or
calling for assistance. Young children and household pets may be the first affected.
Concentration
of CO in Air
ppm
35
The maximum allowable concentration for continuous exposure in any 8 hour period according to OSHA *.
150
Slight headache after 1.5 hours.
200
Slight headache, fatigue, dizziness, nausea after 2-3 hours.
400
Frontal headaches within 1-2 hours, life threatening after 3 hours, also maximum parts per million
in flue gas (on an air free basis) according to US Environmental Protection Agency.
800
Dizziness, nausea and convulsions within 45 minutes. Unconsciousness within 2 hours. Death within 2-3 hours.
1,600
Headache, dizziness and nausea within 20 minutes. Death within 1 hour.
3,200
Headache, dizziness and nausea within 5-10 minutes. Death within 25-30 minutes.
6,400
Headache, dizziness and nausea within 1-2 minutes. Death within 10-15 minutes.
12,800
Death within 1-3 minutes.
ppm
= parts per million
*OSHA = Occupational Safety & Health Association
Table A: Effects of Carbon Monoxide Poisoning
Inhalation Time (approx) and Symptoms Developed
6
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