Abstract
Because of the changing composition of the light duty vehicle fleet and the changing nature of exhaust emission controls and regulations, the emission of unregulated pollutants is of current interest. This paper analyzes and summarizes the available data on the emission levels of pollutants that are not currently subject to U.S. federal regulations. For the light duty diesel vehicle, emissions of sulphur dioxide, nitrogen dioxide, and carbonyls are of the greatest significance, and diesel exhaust fumes appear to be much more photochemically reactive than light duty petrol vehicle exhaust emissions. Nitrous oxide and nitrosamine emissions from the light duty diesel are also of interest, but experimental data are currently inadequate. The catalyst-equipped light duty petrol vehicle has high emissions of many noncriteria pollutants during rich malfunction operation, but during normal operation only nitrogen dioxide, nitrous oxide, hydrogen cyanide, and ammonia are of potential significance. Again, data on nitrosamine emissions are inconclusive. (Author/TRRL)
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