Question

in a closed room if there is some material that is burning you may have felt suffocation why ?

Answer 1

If some material is burning it use oxygen that present in closed room when oxygen level is decreased we feel suffocation because of lack of oxygen

Answer 2

This is because the burning substance generates excessive carbon particles during burning and when those carbon particles combine with oxygen form carbon dioxide gas. So, this leads to the formation of too much carbon dioxide in the closed room which causes suffocation and gradually may lead to death.