What is the minimum volume of liters required for a clearance sample during an asbestos project?

In an asbestos project, the minimum volume of air required for a clearance sample is set to ensure accurate detection of airborne asbestos fibers. A clearance sample is essential after abatement activities to confirm that the area is safe for reoccupancy. The guidelines recommend that the minimum volume of air sampled should be 1,250 liters. This volume allows for a sufficient number of air particles to be captured, increasing the likelihood of detecting any residual asbestos fibers that may pose a risk to health. By collecting a larger volume of air, the analysis becomes more statistically reliable, reducing the probability of false negatives, and ensuring that the area is indeed cleared of any hazardous asbestos contamination.