Extended mileage tests in commercial fleet service were initiated on those control techniques that appeared most promising. Chemical analyses of the exhaust were made for the purpose of correlating the smoke and odor reductions with changes in exhaust composition. ![]() After an initial baseline evaluation of groups of buses and trucks with standard engines, various control techniques were evaluated to determine their effectiveness in reducing smoke and/or odor. firecrackers, or bringing stink bombs to school or a school event. Smoke levels were measured with a PHS-designed full-flow optical smokemeter. depressant of the central nervous system and which is not commonly used or recognized. A system of exhaust dilution was employed to provide realistic odor concentrations to a panel of judges who rated the intensity and quality of the exhaust in terms of a set of chemical standards. A test facility was developed in which full-scale trucks and buses were operated on a chassis dynamometer through operating modes that yielded maximum exhaust smoke and odor. ![]() ![]() Public Health Service by contract with Southwest Research Institute. ![]() A program of research on diesel smoke and odor was sponsored by the U.
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