Which technique is mentioned for sampling air quality after asbestos work?

Clearance air sampling is the correct technique for sampling air quality after asbestos work. This method is specifically designed to evaluate whether the airborne concentrations of asbestos fibers are within acceptable limits after a remediation project. The process typically involves taking air samples post-abatement to ensure that the asbestos removal was effective and that the area can be safely re-occupied.

This technique is crucial because it typically follows a clearance procedure that confirms the efficacy of the work done, allowing for the safe return of occupants. Clearance sampling is generally dictated by regulatory guidelines, which may specify when and how the sampling should occur, alongside acceptable fiber count limits.

Other sampling methods, while they are relevant in monitoring air quality and assessing exposure risks, do not serve the specific purpose of confirming the successful removal of asbestos. Passive air sampling, for instance, is often used for long-term studies and can take days or weeks to yield results. Standard air sampling is more general and may not meet the stringent requirements set post-remediation. Continuous air monitoring usually involves real-time sample collection but is not specifically a post-abatement verification method. Thus, clearance air sampling stands out as the appropriate choice for ensuring that the area is safe after asbestos-related work has been completed.