5
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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