Which safety measure should be taken while working in a scene with hazardous materials?

Using a self-contained breathing apparatus (SCBA) is a critical safety measure when working at a scene involving hazardous materials. The primary purpose of an SCBA is to provide breathable air in environments that may be contaminated with harmful gases or vapors. This protective equipment ensures that responders can effectively operate without risking inhalation of toxic substances, which is vital in maintaining their health and safety.

In situations where hazardous materials are present, the air may contain dangerous fumes that pose severe risks, including respiratory issues or other acute health effects. By using an SCBA, responders can safely enter the hazardous area, perform necessary tasks, and ultimately mitigate the situation without endangering their lives or health.

Other options would not provide adequate safety measures. Ventilation alone may not be enough to eliminate the threat, ignoring chemical exposure poses significant dangers, and simply standing back does not allow for effective response to the emergency. Thus, utilizing an SCBA is considered an essential practice in hazardous material management to protect personnel on the scene.