What CO concentration level (ppm) is considered excessive and warrants medical alert?

The concentration level of carbon monoxide (CO) that is considered excessive and warrants a medical alert is typically over 100 ppm. At this level, exposure can lead to serious symptoms and health risks, including confusion, headaches, dizziness, and other severe effects, particularly in sensitive individuals such as children, the elderly, or those with pre-existing health conditions.

While lower concentrations can cause discomfort and health issues, they are generally not seen as immediate medical emergencies. Levels between 10 and 35 ppm might indicate mild exposure symptoms, but they do not typically require urgent medical intervention. Concentrations from 36 to 99 ppm can lead to more significant health effects with prolonged exposure but would not typically initiate the need for immediate medical alert status. Therefore, values over 100 ppm clearly reflect a hazardous situation that necessitates urgent attention to prevent serious health consequences.