The effect on photochemical smog of converting the U.S. fleet of gasoline vehicles to modern diesel vehicles

Details The effect on photochemical smog of converting the U.S. fleet of gasoline vehicles to modern diesel vehicles The effect on photochemical smog of converting the U.S. fleet of gasoline vehicles to modern diesel vehicles

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3102116j&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 2, CiteID L02116

Physics

2

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Pollution-Urban And Regional (0305), Atmospheric Composition And Structure: Troposphere-Composition And Chemistry

Scientific paper

With the increased use of particle traps and nitrogen oxide (NOx) control devices to reduce air pollution, ``modern'' diesel vehicles are being encouraged over gasoline vehicles globally as a central method of slowing global warming. Data to date, though, suggest that the NO2:NO ratio from modern diesel may exceed that of gasoline, and it is difficult to reduce diesel NOx below gasoline NOx without increasing particle emissions. Here, it is calculated that, unless the diesel NO2:NO ratio and total NOx are reduced to those of gasoline, modern diesel, which should have lower hydrocarbon (HC) and carbon monoxide (CO) emissions than gasoline, may still enhance photochemical smog at the surface and aloft, on average, over the U.S. relative to gasoline. The reason is that vehicle-produced smog in the U.S. depends more on NOx and the NO2:NO ratio than on HCs or CO. It is also found that vehicle NOx controls may be more effective than NO2:NO ratio controls at reducing ozone.

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