The Via-Cell sampler operates on the well established principle of inertial impaction. Particles in the air stream are accelerated as they approach the tapered inlet opening and drawn through a small slit aimed directly at a glass slide. This glass slide contains a water soluable sampling media which is designed to hold particles intact and maintain viability for later analysis. As the particles come through the slit, the air velocity forces the particles to impact into the sampling media, while the air stream makes a sharp 90o turn and proceeds around the slide and out of the cassette. The air flow path through the Via-Cell sampling cassette is illustrated below in Figure 1.
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