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SUMMARY:Recent evidence concerning road vehicle emissions of nitrogen oxid
 es - Dr David Carslaw (Kings College London)
DTSTART:20101008T131500Z
DTEND:20101008T141500Z
UID:TALK26166@talks.cam.ac.uk
CONTACT:Dr Alex Archibald
DESCRIPTION:Emissions of NOx are central to a very wide range of atmospher
 ic chemistry problems. It is essential therefore that we have a good under
 standing of source strengths and how they change with time. This talk will
  consider the comprehensive analysis of recent trend data from across Euro
 pe\, with a particular focus on the UK.  It is shown that trends in NOx an
 d NO2 concentrations have stabilised across most European countries\; part
 icularly in urban areas.  The analysis of a large sample of vehicle emissi
 ons remote sensing data (ca. 65\,000 vehicles) from recent campaigns in th
 e UK show that diesel vehicle emissions from light duty vehicles have chan
 ged little over the past 20 or so years\; in clear disagreement with inven
 tory projections. The number of diesel vehicles in the vehicle fleet has a
 lso increased markedly over the same period. In addition\, these vehicles 
 now use exhaust after-treatment technologies that have increased the propo
 rtion of NOx that is NO2 from around 10% to nearer to 50%.  The evidence f
 or these effects and the wider implications will be addressed.
LOCATION:Pfizer  Lecture Theatre\,  Department of Chemistry
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