Experimental Evaluation of Aftertreatment Devices on Mobile School Bus Emissions from Diesel Powered School Buses

Toback, A.; Hearne, J.; Colligan, S.; Osorio, I.; Hesketh, Robert P.; Marchese, Anthony J.

doi:10.4271/2005-01-1757

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…However, one such on-road study conducted by Toback et al 14 at Rowan University is summarized and compared in Table 4. This study used a portable emissions monitoring system on-board the vehicles to measure emissions.…”

Section: Resultsmentioning

confidence: 99%

On-Road, In-Use Gaseous Emission Measurements by Remote Sensing of School Buses Equipped with Diesel Oxidation Catalysts and Diesel Particulate Filters

Burgard

Provinsal

2009

Journal of the Air & Waste Management Association

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A remote sensing device was used to obtain on-road and in-use gaseous emission measurements from three fleets of schools buses at two locations in Washington State. This paper reports each fleet's carbon monoxide (CO), hydrocarbon (HC), nitric oxide (NO), and nitrogen dioxide (NO 2 ) mean data. The fleets represent current emission retrofit technologies, such as diesel particulate filters and diesel oxidation catalysts, and a control fleet. This study shows that CO and HC emissions decrease with the use of either retrofit technology when compared with control buses of the same initial emission standards. The CO and HC emission reductions are consistent with published U.S. Environmental Protection Agency verified values. The total oxides of nitrogen (NO x ), NO, and the NO 2 /NO x ratio all increase with each retrofit technology when compared with control buses. As was expected, the diesel particulate filters emitted significantly higher levels of NO 2 than the control fleet because of the intentional conversion of NO to NO 2 by these systems. Most prior research suggests that NO x emissions are unaffected by the retrofits; however, these previous studies have not included measurements from retrofit devices on-road and after nearly 5 yr of use. Two 2006 model-year buses were also measured. These vehicles did not have retrofit devices but were built to more stringent new engine standards. Reductions in HCs and NO x were observed for these 2006 vehicles in comparison to other non-retrofit earlier model-year vehicles.

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Section: Resultsmentioning

confidence: 99%