Symptoms of Carbon Monoxide Poisoning:
The concentration of carbon monoxide is measured in parts per million (ppm)
50 ppm: No adverse affects with 8 hours of exposure.
200 ppm: Mild headache after 2-3 hours of exposure.
400 ppm: Headache and nausea after 1-2 hours of exposure.
800 ppm: Headache, nausea, and dizziness after 45 minutes; collapse and unconsciousness after 1 hour of exposure.
1,000 ppm: Loss of consciousness after 1 hour of exposure.
1,600 ppm: Headache, nausea, and dizziness after 20 minutes of exposure.
3,200 ppm: Headache, nausea, and dizziness after 5-10 minutes; collapse and unconsciousness after 30 minutes of exposure.
6,400 ppm: Headache and dizziness after 1-2 minutes; unconsciousness and danger of death after 10-15 minutes of exposure.
12,800 ppm: Immediate physiological effects, unconsciousness and danger of death after 1-3 minutes of exposure.
Source: National Fire Protection Association's Fire Protection Handbook, 19th Edition.
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