What is a critical step before entering a confined space?

Performing gas monitoring for harmful substances present is a critical step before entering a confined space because it directly addresses the health and safety risks associated with such environments. Confined spaces can have hazardous atmospheres due to the presence of toxic gases, low oxygen levels, or flammable substances. Detecting these harmful elements is essential to ensure that the air quality is safe for workers.

Monitoring the atmosphere allows for the identification of any hazards that could lead to serious health issues or even fatalities. If harmful substances are detected, appropriate measures can be taken, such as ventilating the space or providing proper personal protective equipment before any personnel enter. This proactive approach is crucial in preventing accidents and ensuring the safety of workers in confined spaces.