How exactly is wood dust exposure monitored in the workplace?

Wood dust exposure is normally tested using personal sampling. A small pump sits on the worker’s belt, and a sampling head sits near their collar to collect dust from the breathing zone. They wear it while doing their normal tasks — sanding, cutting, routing, sweeping, whatever a typical shift involves.

Afterwards, the filter cartridge goes to a lab to measure how much inhalable dust collected. This gives the most realistic view of actual exposure.

Sometimes area sampling is added for background checks, but personal monitoring is the gold standard because it measures what workers actually inhale.