Effects of Carbon Monoxide on Humans and its Toxicity | Pioneer of a gas alarm gas detector / alarm - Riken Keiki Co., Ltd.

Effects of Carbon Monoxide (CO) on Human Body

Concentration (ppm) Effects and Toxicity
100 No noticeable effects even after breathing for a few hours.
200 A mild headache in around 1.5 hours.
400`500 Headache, nausea and ear ringing in around 1 hour.
600`1000 Loss of consciousness in around 1 ~ 1.5 hours.
1500`2000 Headache, vertigo and disabling nausea in around 0.5 ~ 1 hour, and losing consciousness.
3000`6000 Headache, vertigo, disabling nausea...etc. in a few minutes. 10 ~ 30 minutes exposure can lead to death.
10000 Bring on immediate loss of consciousness and death.