What does an increase in carbon monoxide (CO) levels indicate?

An increase in carbon monoxide (CO) levels is a significant indicator of incomplete combustion. When a fuel burns in the presence of insufficient oxygen, it does not fully convert to carbon dioxide and water, leading to the formation of carbon monoxide. This gas is a result of the fuel not being burned efficiently, meaning that the combustion process is flawed.

In a well-functioning system with adequate oxygen supply, complete combustion would occur, resulting in minimal CO production, primarily carbon dioxide instead. Conversely, no combustion would imply that no energy is being produced, which would not be indicated by the presence of CO. Finally, excessive ventilation can actually help reduce CO levels by supplying more oxygen, thus promoting better combustion. Therefore, an increase in carbon monoxide levels serves as a reliable warning sign of unsafe operating conditions due to incomplete combustion.