Carbon monoxide (CO) is often called the silent killer because it is a highly toxic, colorless, and odorless gas that may accumulate unnoticed in enclosed or poorly ventilated spaces. It harms the human body by reducing the bloodβs ability to carry oxygen from the lungs to the tissues, often resulting in headache, weakness, dizziness, nausea, fainting, and, in severe cases, coma, weak pulse, and respiratory failure.
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