Visibility and Soiling: A Comparison of the Effects of Leaded and Unleaded Gasolines

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Science  04 Feb 1972:
Vol. 175, Issue 4021, pp. 516-518
DOI: 10.1126/science.175.4021.516


The emissions from a fleet of late-model cars fueled with commercial, high-aromatic, unleaded gasoline caused nearly twice as much atmospheric light extinction as those from a matched fleet fueled with commercial, low-aromatic, leaded gasoline, when both were driven according to a consumer operating cycle in an idle traffic tunnel. The increased extinction and greater soiling potential result mainly from greater light absorption by the air-suspended particles from the unleaded fleet.