Abstract
The prediction of plume opacity by using light-scattering theory and measurements in the stack gas at Mohave were in agreement with the observations made by trained observers. A parametric study of the effects of independent variables on plume opacity by using the same light-scattering theory has shown that plume opacity can vary from 14-87 percent depending only on the geographic location of the source and the time of day, with all other factors such as particulate matter emissions remaining the same. This implies that the EPA New Source Performance Standard for plume opacity (20 percent) is not consistent with the particulate matter emissions standard (0.1 lb/10/sup 6/ Btu) for all power plant locations or times of day and days of the year. It is concluded that opacity measurements are not indicative of the mass emissions of particulate matter, and that mass emissions cannot be accurately determined from opacity observations. The use of an opacity standard to enforce a mass emission limitation is therefore difficult to justify on a technical basis. (JTE)
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