Emissions Of Nitrogen Dioxide From Modern
Diesel Vehicles
Author(s)
G. A. Bishop & D. H. Stedman
Abstract
The traditional on-road emissions remote sensing technique has been enhanced
with the ability to monitor not only CO, CO2, HC and NO, but also SO2, NH3
and NO2. Modern diesel powered vehicles, particularly in Japan and Europe are
equipped with diesel particle filters (DPFs). These traps are frequently designed
to be self regenerating by means of a prior catalytic oxidation of the exhaust NO
to NO2. Because of this intentional conversion to NO2, the ratio of NO2 to NO in
modern diesel vehicles is very different from older vehicles. The detailed results
of measurements from several thousand vehicles measured in Japan, Austria and
Sweden in 2006 and 2007 will be compared to results from the USA where there
are very few vehicles equipped with DPFs. The overall picture is vehicles
without DPFs in the USA emit between 5 and 10% NO2 while vehicles with
DPFs are often observed at 50% NO2 by moles. This, together with the overall
NOx reductions has strong negative implications for local photochemical ozone
production.
Keywords: nitrogen dioxide, automobile emissions, on-road remote sensing.
1 Introduction
In his review of diesel exhaust emissions control strategies, Lemaire [1] suggests
that nitrogen dioxide (NO2) was forgotten as a separate component of the NOx
emissions from diesel vehicles. He further suggests that this omission has caused
the observed increases in NO2 and ozone in a number of cities in Europe. For
instance, he shows a very strong correlation between the imposition of diesel
particle filters (DPFs) on London buses with the increase in the NO2/NOx ratio in
London. Carslaw et al. [2] draw the same conclusion.
Keywords
nitrogen dioxide, automobile emissions, on-road remote sensing.
Related Book
Other papers in this volume
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