This ad space available.
Asphyxiation is an extreme hazard when working in enclosed spaces.
MSDS Relevance Asphyxiants themselves are not toxic materials. They work by displacing so much oxygen from the ambient atmosphere that the hemoglobin in the blood can not pick up enough oxygen from the lungs to fully oxygenate the tissues. As a result, the victim slowly suffocates. All of the above except carbon dioxide are odorless and tasteless. You can be overcome by these gases without realizing they are present.