Which of the following CANNOT be detected by air monitoring?

Mechanical hazards cannot be detected by air monitoring because they relate to the physical conditions of equipment and machinery, rather than to the air quality or atmospheric conditions. Mechanical hazards are typically associated with moving parts, machinery malfunctions, or equipment failures that present risks of injury. Air monitoring focuses on analyzing the air composition and identifying the presence of hazardous substances, toxic chemicals, fire and explosion risks, or conditions such as oxygen deficiency.

In contrast, toxic chemicals, fire and explosion hazards, and oxygen levels are all detectable through air monitoring. Air monitoring devices are specifically designed to assess the presence of hazardous airborne substances, monitor for combustible gases, and check for adequate oxygen levels, ensuring that the environment is safe for workers.