Thistle, Harold W.; Trent, Andy ; Hammer, Robert ; Fisher, Rich . 1999. Experimental Design: Collocation of PM2.5 Particulate Monitors and Nephelometers. 9925 2825. Missoula, MT: U.S. Department of Agriculture, Forest Service, National Technology and Development Program.
Describes proposed field tests to determine the accuracy of PM2.5 monitors that evaluate the amount of airborne particulate matter less than 2.5 microns in diameter and nephelometers that measure visibility in the atmosphere. The PM2.5 monitors and nephelometers can measure particulate concentrations in real-time, but the laboratory tests have shown that they may overestimate the concentration. Gravimetric particulate samplers are more accurate, but they require collecting particulate on a filter and weighing the filter in a laboratory. Managers do not get the data for weeks. This test will compare the results from a gravimetric sampler to those of PM2.5 monitors and nephelometers over a period of months at two field sites in Montana.
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