Under certain circumstances, sources of air pollution may be able to meet their obligations under the Clean Air Act by the use of the bubble concept. State and local agency officials are responsible for determining the validity of bubble proposals. Thus, these officials must be in a position to determine if claimed reductions in fugitive emissions from such sources as roadways and storage piles can be substantiated for the control methods proposed. There are many studies available to the official that discuss the effectiveness of various control techniques for nontraditional particulate emissions. This User's Guide provides state and local agency officials and those responsible for conducting fugitive particulate demonstration studies insight into the validity of recent studies. It also stresses the considerations of importance when planning this type of study. From the data presently available, it was not possible to develop quantitative emission factors of control efficiencies for the various control alternatives.