The DC1700 Air Quality Monitor is designed with two display bands with threshold sensitivities of 0.5 micron and 2.5 micron. The 0.5 micron band will display particle counts of 0.5 micron or greater in a .01 cubit foot volume. The same process is true for the 2.5 micron band; it will display particle counts of 2.5 micron or greater particles in a .01 cubit foot volume. The DC1700 is suitable for determining particle counts as related to PM2.5 Particle Measurement standard, but not mass of the particles, by subtracting the counts from the 2.5 micron display from the 0.5 micron display to give a particle count of 2.5 microns or less. The size limit of particles exceeds those required by PM10 in both bands.