Which hazards should monitoring equipment be able to measure in confined spaces?

Monitoring equipment in confined spaces is crucial for ensuring the safety of workers. The correct choice focuses on measuring oxygen levels and the presence of toxic air contaminants.

In confined spaces, the atmosphere can change rapidly, presenting various hazards. Oxygen deficiency is a significant concern, as it can lead to unconsciousness or even death if levels drop below the safe threshold. Additionally, toxic air contaminants such as carbon monoxide, hydrogen sulfide, or volatile organic compounds can pose immediate health risks, potentially causing serious harm to anyone exposed.

Monitoring for these specific hazards is a primary focus because they are directly related to the health and safety of workers entering or working in confined spaces. Other options, while important in certain contexts, do not address the urgent and immediate risks posed by inadequate oxygen levels or toxic substances in the environment. Thus, monitoring equipment must primarily be able to measure the levels of oxygen and toxic air contaminants to ensure a safe working atmosphere in confined spaces.