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Mild Exposure: Slight headache, nausea, vomiting, fatigue (often described as
“flu-like” symptoms).
Medium Exposure
: Severe throbbing headache, drowsiness, confusion, fast heart
rate.
Extreme Exposure
: Unconsciousness, convulsions, cardiorespiratory failure, death.
A high level of CO for a short period (e.g. 350 ppm CO for 30 minutes) will cause the
same symptoms, a slight headache, as a lower level for a longer time (e.g. 150 ppm
for 90 minutes). Table A shows how exposure to different concentrations of CO
generally affects people.
Many cases of reported Carbon Monoxide poisoning indicate that while victims are
aware they are not well, they become so disorientated they are unable to save
themselves by either leaving the building or calling for assistance. Young children and
household pets may be the first affected.