Carbon Monoxide, Quietly Ruining Everyone's Afternoon

Combustion of organic hydrocarbons requires an adequate stoichiometric supply of oxygen to produce harmless carbon dioxide ($CO_2$) and water ($H_2O$). When oxygen is restricted—in a clogged chimney, unserviced gas boiler, indoor generator, charcoal brazier, or indoor grill—incomplete combustion generates carbon monoxide ($CO$).

Biochemical Cellular Asphyxiation

Carbon monoxide is universally known in clinical toxicology as the "silent killer" because it has no odor, no color, no taste, and causes no respiratory irritation.

Once inhaled into the pulmonary alveoli, carbon monoxide diffuses effortlessly across the capillary membrane and binds to the iron heme groups of hemoglobin with an affinity 200 to 250 times greater than oxygen.

This forms carboxyhemoglobin ($COHb$), which not only renders hemoglobin incapable of carrying oxygen to the brain and heart, but also shifts the oxygen-hemoglobin dissociation curve to the left, preventing the remaining oxygen from being released to hypoxic tissues.

The Flu-Like Symptoms Trap

Because carbon monoxide poisoning causes no coughing or eye stinging, early toxicity presents deceptively as a viral illness:

• Dull frontal tension headache.
• Dizziness and lightheadedness.
• Nausea, vomiting, and fatigue.
• Confusion and memory loss.

If multiple people (or pets) in the same building simultaneously develop "flu-like" symptoms that mysteriously improve when they step outdoors, assume carbon monoxide exposure until proven otherwise.