Table 2 Degree of harm to human body of different CO concentrations25.

From: Simulation of emergency evacuation from construction site of prefabricated buildings

CO concentration of flue gas (ppm)

Time (min)

Degree of hazard

200

120–180

Mild headache and fatigue

400

60–120

Secondary headaches

800

45

Unconsciousness, vomiting

1600

20

Headache, dizziness, nausea

3200

10–15

Death