What is an effect of poor ventilation in a combustion room?

The impact of poor ventilation in a combustion room primarily manifests as an increased risk of carbon monoxide. When ventilation is inadequate, the combustion process is hindered, leading to incomplete combustion of fuel. This incomplete combustion generates harmful byproducts, including carbon monoxide, which is a colorless, odorless gas that can be extremely dangerous when allowed to accumulate in enclosed spaces.

Proper ventilation is essential for ensuring that there is sufficient oxygen available for the combustion process, allowing fuels to burn cleanly and efficiently. Without it, the balance needed for safe combustion is disrupted, resulting in elevated levels of carbon monoxide, which can pose serious health risks, including headaches, dizziness, and even life-threatening situations.

The other options do not accurately reflect the consequences of poor ventilation. Poor ventilation would not lead to increased efficiency of the furnace; in fact, efficiency typically decreases due to improper combustion. Furthermore, air quality would not improve under such conditions, as reduced ventilation can lead to higher levels of pollutants such as carbon monoxide. Lastly, the particulate matter in the air would likely increase due to incomplete combustion, not decrease. Therefore, the correct choice highlights a significant safety concern regarding inadequate ventilation in a combustion room.