What is the first action that should be taken when trigger levels have been reached during a fumigation?

When trigger levels have been reached during a fumigation, the first action that should be taken is to stop work. This immediate action is essential to ensure the safety of all personnel involved in the fumigation process. Stopping work helps to prevent further exposure to potentially harmful gases or chemicals, safeguarding both the workers and the surrounding environment.

Taking air samples or notifying emergency services are critical steps that may follow, but they are secondary actions that would usually occur only after the work has been halted. Removing the Air Purifying Respirator (APR) is not advisable as it can expose the individual to harmful agents present in the atmosphere. Prioritizing safety by stopping all operations is a foundational step in managing the risks associated with fumigation when trigger levels are exceeded.