An inertial sizing device that collects suspended particles less than 10 microns in diameter and separates them into course (1.5-10 um) and fine (<2.5 um) particle size fractions.
Source: US Environmental Protection Agency. 1999. Sampling of Ambient Air for PM10 Using an Andersen dichotomous sampler. Accessed 9 September 2013. Available at http://www.frames.gov