"Although charged fogging has been widely applied to industrial sources of fugitive dust little data are available regarding fogger control effectiveness on particulate matter. To obtain such data, a full-scale demonstration of a charged fogger was conducted on several industrial fugitive emission sources. The sources tested included a primary rock crushing operation, a secondary rock crushing operation, a molten iron spout hole at a blast furnace cast house, and a coke screening operation. The fogger evaluated was the "Fogger IV" manufactured by the Ritten Corporation. The report presents and discusses the results of these four source tests. The report also presents and discusses the results of three other source tests. The same charged foggers were used, along with a charged fogger developed by AeroVironment Inc., Pasadena, CA. The sources for field testing the two foggers were a stainless steel slab torch cutting operation, a conveyor transfer operation at a recycle (sinter) plant and a limestone crusher/conveyor operation. In general, the tests showed that (1) the control of emissions by the two foggers are generally comparable, (2) fogger efficiency depends on the positions of the foggers in relation to the source, and (3) charging a water spray appears to increase its effectiveness in controlling particulate matter emissions by up to 40 percent."