Which practice can help mitigate hazards in confined spaces?

Regularly testing air quality is essential in confined spaces as it directly addresses the potential hazards related to insufficient oxygen levels and the presence of toxic gases or vapors. Confined spaces often have limited air circulation, which can lead to dangerous conditions that may not be immediately apparent. By testing the air quality, workers can ensure that the environment is safe for entry and work. This practice allows for the identification of harmful substances that could pose health risks, enabling appropriate safety measures to be taken, such as ventilation or personal protective equipment.

The other practices do not effectively mitigate hazards. Ignoring ventilation needs can lead to the accumulation of harmful gases and deplete oxygen levels. Limiting the number of workers may reduce congestion but does not inherently improve air quality or safety conditions. Using only basic personal protective equipment may not be sufficient in a confined space where air quality and other environmental factors significantly affect worker safety. Therefore, regular air quality testing is a critical component of safety protocols in confined spaces.