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Table A: Effects of Carbon Monoxide Poisoning
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.
2.3 What happens when your CO Alarm detects Carbon Monoxide ?
When the Alarm detects potentally dangerous levels of CO, it flashes the red alarm
light and then sounds a loud alarm if the CO persists.
8
ppm
Concentration
of CO in Air
Inhalation Time (approx) and Symptoms Developed
ppm = parts per million
*OSHA Occupational Safety & Health Association