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San Joaquin County Community Diesel Engine Emission Control Technologies <br /> Development Department <br /> exhaust stream adsorbs when the engine rims lean. After the adsorber has been <br /> fully saturated with NOx,the system is regenerated with released NOx being <br /> catalytically reduced when the engine runs rich. NOx reductions in excess of 80- _ <br /> 90 percent have been reported(Majewski 2001). A prerequisite for proper <br /> functioning of this new technology is low-sulfur fuel. <br /> Reprogramming of Defeat Devices <br /> Some NOx reductions may be achieved through reprogramming of engines with <br /> defeat devices. In October 1998, some heavy-duty engine manufacturers and the <br /> U.S. EPA settled a court case regarding the use of an illegal emission defeat — <br /> device. Engine manufacturers had installed engine control software to artificially <br /> increase NOx emissions during steady highway cruising in order to maintain high <br /> fuel economy at highway speeds. The settlement required engine manufacturers <br /> to lower NOx emissions by upgrading existing heavy-duty engines and disabling <br /> the engine control software. Although the consent decree does produce NOx <br /> emission reductions,the scope of the decree is relatively limited in that it is only <br /> applicable to those on-road engines that had the devices originally. Early — <br /> reprogramming does yield NOx emission reductions that could be verified. (Air <br /> Resources Board. 2001.) <br /> References Cited <br /> Air Resources Board. 2001. The California Almanac of Emissions and Air <br /> Quality. <br /> Air Resources Board. 1999. Informational Package for the Heavy-Duty Vehicle <br /> Inspection Program, Periodic Smoke Inspection Program. Mobile Source <br /> Operations Division,Mobile Source Enforcement Branch. — <br /> Artelt, S., Kock, H.Nachtigall,D.,Heinrich,U. 1998. Bioavailability of <br /> platinum emitted from automobile exhaust. Toxicology Letters 96,97 163- — <br /> 167. <br /> Artelt, S., Creutzenberg, O., Kock,H.,Levsen K.,Nachtigall, D.,Heinrich, U., — <br /> Ruble,T., Schlogl,R. 1999. Bioavailability offtne dispersed platinum as <br /> emitted from automotive catalytic converters: a model study. The Science of <br /> the Total Environment,228, 219-242. — <br /> Committee on Toxicity of Chemicals. 1996. Toxicity, Mutagenicity and <br /> Carcinogenicity Report. Platinum-based Fuel Catalyst for Diesel Fuel. <br /> http://www.official-document/doh/toxicity/chap-lb.htm. <br /> DieselNet Technology Guide. 2000.02b. Diesel Filter Systems, Traps with Fuel <br /> Additives. <br /> DeSilva Gates Quarry Project <br /> Draft Environmental Impact Report L-12 <br /> gas osios.as <br />