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SAFETY
Official web site for City of Corpus Christi, Texas

Stages of Carbon Monoxide Poisoning

*PPM

Warning Signs

Time

50
No effect 8 hours

200
Possible mild frontal headache 2 to 3 hours

400
Frontal headache and nausea 1 to 2 hours

400
Occipital headache and nausea 2.5 to 3.5 hours

800
Headache, dizziness and nausea 20 minutes

1600
Collapse, possible death 2 hours

3200
Headache, dizziness 5 to 10 minutes

3200
Unconscious and in danger 10 to 15 minutes

128,000
Unconscious almost instantly, death imminent 1 to 3 minutes
These values are approximate and vary as to the individual's state of health and physical activities.
 
*ppm - parts per million - Gas concentration volume measurement
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