In incidents of fire in closed areas, deaths are reported due to hypoxia (deficiency of oxygen in tissues) even though the victims are not burnt. What is the reason for this?

In incidents of fire in closed areas, deaths are reported due to hypox

1.	In incidents of fire in closed areas, deaths are reported due to hypoxia (deficiency of oxygen in tissues) even though the victims are not burnt. What is the reason for this?
Answer» In incidents of fire in closed areas, deaths are reported due to hypoxia (deficiency of oxygen in tissues) even though the victims are not burnt. What is the reason for this?