Microorganisms in soil act as a major sink for CO, converting a significant amount into CO2. However, when inhaled, CO interferes with the blood's ability to transport oxygen to body cells. It binds strongly to hemoglobin, forming carboxyhemoglobin (COHb), which reduces the blood's oxygencarrying capacity . Even small percentages of COHb can have physiological effects, including impairment in time-interval discrimination at 2.5%, psychomotor response time impacts at 5%, and dizziness and headaches at 10%. Higher concentrations can lead to lethality, with a COHb concentration of 50% being lethal .