Table 2.

Demonstrating the effects of certain concentrations of carbon monoxide on human health. COHb is the percentage of carbon monoxide in the blood. Typical concentrations in the home are 0.5–5 ppm (united states environmental protection agency).

Carbon Monoxide Concentration (ppm)	COHb Level (%)	Signs and Symptoms
35	<10	Headache and dizziness within 6 to 8 hours of exposure
100	>10	Slight headache in 2 to 3 hours
200	20	Slight headache within 2 to 3 hours; loss of judgement
400	25	Frontal headache within 1 to 2 hours
800	30	Dizziness, nausea and convulsions within 45 minutes, insensible within 2 hours
1,600	40	Headache, tachycardia, dizziness and nausea within 20 minutes; death within 30 minutes
3,200	50	Headache dizziness and nausea in 5 to 10 minutes; death within 30 minutes
6,400	60	Headache and dizziness in 1 to 2 minutes; convulsions, respiratory arrest, and death in less than 20 minutes
12,800	>70	Death in less than 3 minutes