What does prolonged exposure to 9 ppm of CO indicate?

Prolonged exposure to 9 parts per million (ppm) of carbon monoxide (CO) can indeed be harmful to health. Carbon monoxide is a colorless, odorless gas that interferes with the body’s ability to transport oxygen in the blood. Although lower concentrations of CO, such as 9 ppm, may not cause immediate symptoms, long-term exposure can lead to cumulative effects on health, including headaches, dizziness, confusion, and in more severe cases, impaired motor functions or cardiovascular issues.

While levels below 9 ppm might be considered safe for short periods, continuous exposure over time can result in elevated blood carboxyhemoglobin levels, which disrupt normal physiological processes. Therefore, it is essential to monitor and limit exposure to CO even at relatively low concentrations like 9 ppm, as they can still pose a risk to health over prolonged periods. This understanding underscores the importance of maintaining good ventilation and monitoring indoor air quality, especially in places where combustion appliances are used.