
5
2.3 Symptoms of Carbon Monoxide 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
permillioninuegas(onanairfreebasis)accordingtoUSEnvironmentalProtection
Agency.
800 Dizziness,nauseaandconvulsionswithin45minutes.Unconsciousnesswithin
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.
3,400 Headache, dizziness and nausea within 1-2 minutes. Death within 10-15 minutes.
12,800 Death within 1-3 minutes.
The following symptoms may be related to CARBON MONOXIDE POISONING and should be discussed
with ALL members of the household:
Mild exposure:Headaches,runningnose,soreeyes,oftendescribedas“u”-likesymptoms;
Medium exposure: Dizziness,drowsiness,vomiting;
Extreme Exposure:Unconsciousness,braindamage,death.
Many cases of reported CARBON MONOXIDE POISONING indicate that while victims are aware they are
not well, they become so disoriented they are unable to save themselves by either exiting the building or
calling for assistance.
▲ppm=partspermillion*OSHAOccupationalSafety&HealthAssociation