What is the minimum level at which a CO detector will alarm in parts per million (PPM)?

The minimum level at which a carbon monoxide (CO) detector will alarm is typically set at 70 parts per million (PPM). This threshold is established based on health and safety guidelines that prioritize early detection of CO exposure to prevent serious health risks. At levels around 70 PPM, individuals may start to experience some symptoms, and the alarm serves as an important warning to evacuate the area and seek fresh air.

In general, CO detectors are designed to activate at this level to provide sufficient time for occupants to respond before health effects become more severe, which aligns with recommendations from safety organizations and studies on CO exposure. This is crucial for maintaining safety in environments where CO can accumulate, such as homes with gas appliances or attached garages.