What action should be taken before entering a confined space with HAZMAT?

Before entering a confined space that may contain hazardous materials, the appropriate action is to wear a self-contained breathing apparatus (SCBA). This equipment is essential because it provides a safe breathing environment in situations where air quality may be compromised due to the presence of harmful gases, vapors, or lack of oxygen. The SCBA supplies breathable air to the user, ensuring that they can safely perform their tasks without risking asphyxiation or exposure to toxic substances.

In confined spaces, hazards can rapidly change and may not be immediately detectable, making the SCBA a critical piece of personal protective equipment. It allows responders or workers to enter the space without being subject to the potentially harmful atmospheres that may exist. It is particularly important in situations where air monitoring has indicated the presence of hazardous atmospheric conditions.

Other personal protective equipment, such as a helmet, gloves, or reflective gear, plays a role in overall safety, but these items do not address the immediate and critical risk of respiratory hazards associated with confined spaces containing hazardous materials. Therefore, wearing an SCBA is the most vital and correct choice among the options provided.