What is an acceptable CO reading for a commercial occupancy where no one sleeps?

The acceptable carbon monoxide (CO) reading for a commercial occupancy where no one sleeps is 35 parts per million (ppm). This standard is based on guidelines established to protect the health and safety of individuals in various environments.

In general, the acceptable level of CO exposure for most people in non-residential settings is set at this threshold to minimize any potential adverse health effects. While lower readings, such as 9 ppm, may be considered safe, they do not align with the recognized permissible limits for specific commercial spaces. Readings at 30 ppm could raise concerns, especially in poorly ventilated areas or with prolonged exposure, while higher levels like 50 ppm present a significant risk of acute symptoms and health effects. Thus, 35 ppm serves as a balance between safety and practicality for commercial occupancies without sleeping facilities.