Appendix G: Carbon Monoxide in Ambient Air Chart
This chart contains maximum exposure levels and times for carbon monoxide.
This is a general guidline only. It is recommended you check with your local
government for guidelines in your area.
45
Concentration of
CO in the air
Toxic Symptoms
9ppm
The maximium allowable concentration for
short time exposure in a living area according
to ASHRAE.
35ppm
The maximum allowable concentration for con-
tinuous exposure in an 8 hour period accord-
ing to OSHA.
200ppm
Maximum allowable concentration at any time
according to OSHA. Slight headache, fatigue,
dizziness and nausea after 2 to 3 hours expo-
sure.
400ppm
Frontal headaches and other symptoms inten-
sify after 1 to 2 hours exposure. Life threaten-
ing after 3 hours. Maximum allowable limit in
flue gas according to EPA and AGA.
800ppm
Headache, dizziness, nausea, and convul-
sions within 45 minutes of exposure.
Unconscious within 2 hours. Death within 2 to
3 hours.
1,600ppm
Headache, dizziness, and nausea within 20
minutes of exposure. Death within 1 hour.
3,200ppm
Headache, dizziness, and nausea within 5 to
10 minutes of exposure.
Death within 30 minutes to 1 hour.
6,400ppm
Headache, dizziness, and nausea within 1 to 2
minutes of exposure.
Death within 10 to 30 minutes.
12,800ppm
Death within 1 to 3 minutes.
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