Parent document       Health effects of CO

Concentration [%]

Effects

less than 0.4

Normal levels of carboxy-hemoglobin for non smokers

2.5 and 3

Decrease performance in angina patients

4 and 5

Cause headache due to oxygen deficiency

around 10

Affected heart function; vision impairment, skills and learning disabilities

higher concentrations

Produce more serious effects and even death