Abstract

Ground level ozone is one major secondary pollutant which is formed in the atmosphere by a variety of photochemical reactions involving volatile organic compounds and oxides of nitrogen in the presence of sunlight. Due to their reactivity, the exhaust emissions from heavy duty diesel engines are of particular concern and it is desirable to reduce the ozone forming potential of the exhaust emissions by reducing the mass of exhaust emissions. This study investigates the effect of retrofitted after-treatment devices and ultra-low sulfur diesel fuels on the ozone forming potential of exhaust emissions from heavy-duty off-road diesel engines. Specifically, the objective was to determine the effect of two diesel particulate filters and two ultra-low sulfur diesel fuels on the ozone forming potential from the 3 test diesel engines retrofitted with and without passive diesel particulate filters.