What is the acceptable flow rate for personal air sampling?

The acceptable flow rate for personal air sampling is typically in the range of 0.5 to 2.5 liters per minute. This flow rate is optimal for accurately capturing air samples without compromising the integrity of the sample being collected. Sampling at this flow rate ensures that the air passes through the sampling device properly, allowing for the effective collection of airborne particles, including asbestos fibers, over a specified period.

When utilizing lower flow rates too consistently, there may be a risk of insufficient sample volume, which could hinder detection limits and make it challenging to assess exposure risks accurately. On the other hand, excessively high flow rates can lead to a biased sample by drawing in larger particles that wouldn't typically be inhaled by a worker, thus altering the assessment.

The range of 0.5 to 2.5 liters/min strikes a balance that captures a representative air sample reflective of worker exposure, aligning with industry guidelines for personal air sampling.