CO concentration, effects
0 PPM Normal, fresh air.
9 PPM Maximum recommended indoor CO level
800 PPM Headache, nausea, and dizziness after 45 minutes; collapse and unconsciousness after 1 hour of exposure.
Death within 2-3 hours.
1000 PPM Loss of consciousness after 1 hour of exposure.
1600 PPM Headache, nausea, and dizziness after 20 minutes of exposure.
Death within 1-2 hours.
3200 PPM Headache, nausea, and dizziness after 5-10 minutes; collapse and unconsciousness after 30 minutes of exposure.
Death within 1 hour.
6400 PPM Death within 30 minutes.
12,800 PPM Immediate physiological effects, unconsciousness.
Death within 1-3 minutes of exposure