Average Emission Rates of Polynuclear Aromatic Hydrocarbons and Mileage Accumulation of Automobiles
1979 Volume 14 Issue 2 Pages 53-61
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1979 Volume 14 Issue 2 Pages 53-61
The relation of emission rates of polynuclear aromatic hydrocarbons (PAH) from automobiles to their mileages was studied by test runs of 26 Japanese cars in ordinary city service. The mode of the change of PAH emission rate vs. mileage accumulation varied among the individual cars. However, for the groups of cars, a linear relation between the average' PAH emission rate and the average mileage was recognized at mileages above 20, 000 km. A linear relation between the average consumption rate of engine oil and the average mileage was also recognized at mileages above 20, 000km. That is, the high PAH emissions from used cars wit high mileage were mainly due to the high oil consumption.
It was found that the PAH emissions under used oil condition were higher than those under new oil condition. This was considered to be due to the increase in oil consumption rate by the lowering of oil viscosity and secondarily clue to the contribution of PAH accumulated in oil during running
