What is the first thing an individual should check before entering a confined space?

The first thing an individual should check before entering a confined space is the availability of breathable air. This is crucial because confined spaces can often have limited ventilation and may contain harmful gases or insufficient oxygen levels. Without confirming that the air is safe to breathe, an individual risks suffocation or exposure to toxic environments, which can lead to serious health hazards or even fatalities. Ensuring that there is adequate breathable air is a fundamental safety precaution that must be taken before assessing other conditions, such as noise levels, temperature, or lighting, as breathing safely is paramount in confined space entry protocols.