Air sampler is used to both detect and measure exposures. It is done to determine the quality of the air the worker is breathing or would breathe if not protected. Samples are usually collected by placing a battery-operated air pump on the wearer's belt and clipping a collection tube or filter in the breathing zone, usually on the collar near the nose. Air from the environment is pulled into the collection device where the contaminants are trapped, and then the sample is sent to analysis