Symptoms Associated with a Given Concentration of CO Over Time
PPM CO Time Symptoms
35 8 hours Maximum exposure allowed by OSHA in the workplace over an eight hour period
200 2-3 hours

Mild headache, fatigue, nausea and dizziness
400 1-2 hours Serious headache - other symptoms intensify. life threatening after 3 hours
800 45 minutes Dizziness, nausea and convulsions. Unconscious within 2 hours. Death within 2-3 hours
1600 20 minutes Headache, dizziness and nausea. Death within 1 hour
3200 5 - 10 minutes Headache, dizziness and nausea. Death within 1 hour
12,800 1 - 3 minutes Death

 
What are the medical effects of CO?

Carbon monoxide inhibits the blood's ability to carry oxygen to body tissues including vital organs such as the heart and brain. When CO in inhaled, it combines with the oxygen carrying hemoglobin of the blood to form carboxyhemoglobin (COHb). Once combined with the hemoglobin, that hemoglobin is no longer available for transporting oxygen.
 

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