Imperial College London
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ProfessorHelenApSimon

Faculty of Natural Sciences, Centre for Environmental Policy

Professor of Air Pollution Studies
 
 
 
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Contact

 

+44 (0)20 7594 9292h.apsimon

 
 
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Location

 

305Weeks BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{O'Driscoll:2016:10.1016/j.atmosenv.2016.09.021,
author = {O'Driscoll, R and ApSimon, HM and Oxley, T and Molden, N and Stettler, MEJ and Thiyagarajah, A},
doi = {10.1016/j.atmosenv.2016.09.021},
journal = {Atmospheric Environment},
pages = {81--91},
title = {A Portable Emissions Measurement System (PEMS) study of NO<inf>x</inf> and primary NO<inf>2</inf> emissions from Euro 6 diesel passenger cars and comparison with COPERT emission factors},
url = {http://dx.doi.org/10.1016/j.atmosenv.2016.09.021},
volume = {145},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Real world emissions of oxides of nitrogen (NOx) often greatly exceed those achieved in the laboratory based type approval process. In this paper the real world emissions from a substantial sample of the latest Euro 6 diesel passenger cars are presented with a focus on NOx and primary NO2. Portable Emissions Measurement System (PEMS) data is analysed from 39 Euro 6 diesel passenger cars over a test route comprised of urban and motorway sections. The sample includes vehicles installed with exhaust gas recirculation (EGR), lean NOx traps (LNT), or selective catalytic reduction (SCR). The results show wide variability in NOx emissions from 1 to 22 times the type approval limit. The average NOx emission, 0.36 (sd. 0.36) g km−1, is 4.5 times the Euro 6 limit. The average fraction primary NO2 (fNO2) is 44 (sd. 20) %. Higher emissions during the urban section of the route are attributed to an increased number of acceleration events. Comparisons between PEMS measurements and COPERT speed dependent emissions factors show PEMS measurements to be on average 1.6 times higher than COPERT estimates for NOx and 2.5 times for NO2. However, by removing the 5 most polluting vehicles average emissions were reduced considerably.
AU  - O'Driscoll,R
AU  - ApSimon,HM
AU  - Oxley,T
AU  - Molden,N
AU  - Stettler,MEJ
AU  - Thiyagarajah,A
DO  - 10.1016/j.atmosenv.2016.09.021
EP  - 91
PY  - 2016///
SN  - 1352-2310
SP  - 81
TI  - A Portable Emissions Measurement System (PEMS) study of NO<inf>x</inf> and primary NO<inf>2</inf> emissions from Euro 6 diesel passenger cars and comparison with COPERT emission factors
T2  - Atmospheric Environment
UR  - http://dx.doi.org/10.1016/j.atmosenv.2016.09.021
UR  - http://hdl.handle.net/10044/1/40122
VL  - 145
ER  -
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