At what point should the SCBA mask be donned?

The SCBA mask should be donned before entering hazardous environments to ensure that the user is fully protected from harmful gases, smoke, or other toxic exposures present in these areas. This proactive approach is crucial as it provides immediate respiratory protection and enables the wearer to respond effectively without risking inhalation of hazardous substances. Wearing the SCBA mask prior to encountering the hazardous atmosphere maximizes safety and preparedness, ensuring the individual can operate efficiently and effectively in their duties. Delaying the donning of the mask until later stages could expose the user to dangerous conditions, highlighting the importance of preparation in protecting health and safety.