When should air testing be conducted at a worksite?

Air testing should be conducted before an employee enters a space to ensure that the atmosphere is safe and free from harmful contaminants. This is a critical step in safeguarding workers' health and safety by identifying any hazardous conditions that may be present, such as toxic gases, low oxygen levels, or flammable vapors. Conducting air tests prior to entry allows for necessary precautions or personal protective equipment to be utilized, thereby minimizing the risk of accidents or health issues.

In contrast, conducting air testing every hour during operations may not be sufficient if the initial conditions are hazardous. Conversely, performing tests only when elevated temperatures are present does not account for other potential hazards that could exist in various environments. Lastly, testing at the end of the day does not effectively protect workers who may enter the space during the workday. Ensuring safety through air testing before entry effectively aligns with OSHA regulations and the primary goal of maintaining a safe working environment.