26
3.1 Symptoms of CO poisoning
Table A
Concentration
of CO in Air
ppm
Inhalation Time (approx) and Symptoms Developed
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 and Health Association
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