At what parts per million (ppm) should firefighters don their SCBA during CO emergencies?

Firefighters should don their Self-Contained Breathing Apparatus (SCBA) during carbon monoxide (CO) emergencies at levels of 35 parts per million (ppm) and higher. This concentration is significant because CO is a colorless, odorless gas that can lead to serious health effects, including life-threatening conditions, especially for those exposed in environments with limited airflow.

The decision to use SCBA at this level is based on the understanding that even low levels of CO can impair cognitive function and physical abilities, which are critical in emergency situations. By mandating the use of SCBA at 35 ppm, the protocol focuses on protecting firefighters from exposure to potentially hazardous conditions.

In the context of the other potential choices, the levels below 35 ppm are generally considered safe for short-term exposure under controlled conditions. However, as the ppm increases, the risk of adverse health effects escalates significantly, which is why the threshold for donning SCBA is set at 35 ppm. This ensures that firefighters prioritize their health and safety while effectively managing the emergency situation.