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A meeting on URBAN AIR QUALITY MODELLINGhosted by Air Pollution Research in London
Tuesday 4 March 2003
Modelling Air Quality in Urban Canyons
Dr Sotiris Vardoulakis
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Monitoring Sites in Paris
Rennes Voltaire
Leclerc
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passive tubes
Analysers & active samplers
Anemometer & weather station
wind
2.5
2.0
4.5
3.1h: 20.2 m
h: 4.9 mh: 4.2 m
h: 17.2 m
1.3
30 m
25 m
INERIS
h: 2.8 m
Benzene (ppb)
Boulevard Voltaire - December 1998
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h: 17.73 m
2.8 m
1.5
2.8
2.1
1.1h: 17.8 m
h: 4.3 m
h: 1.6 m
h: 17.8 m
h: 4.4 m
h: 3.3 m
h: 1.6 m1.7
1.5
1.62.5 m
Rue de Rennes - July 1999
22 m
wind
INERIS
25 m
0.5 0.4
Benzene (ppb)
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Benzene (ppb)
INERIS
wind
2.6 2.5
1.8
1.2
1.7
2.9
0.9
0.9
0.9
1.1
1.4
Avenue Leclerc - July 2001
h: 16.5 m
h: 7.8 m
h: 1.5 m
24 m
h: 2.6 m h: 2.7 m
45 m
h: 2.6 m
h: 9.1 m
h: 16.3 m
h: 30.5 m
h: 2.8 m
36 m
h: 3.3 m 0.8
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Benzene (ppb)
INERIS
wind
2.6 2.5
1.8
1.2
1.7
2.9
0.9
0.9
0.9
1.1
1.4
Avenue Leclerc - July 2001
24 m
45 m
36 m
0.8
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Street Canyon Modelling
Dispersion Models: OSPM - AEOLIUS - STREET
Emission Factors: Buckland - IMPACT - Touaty
Meteorological Data: Montsouris - St. Jacques - Orly Airport
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0
2
4
6
8
10
12
1 2 3 4Sampling locations
Be
nze
ne
(p
pb
)
max
median
min
observed
EU
Boulevard Voltaire (regular canyon)
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0
1
2
3
4
5
6
1 2 3 4 5 6 7 8 9 10 11 12Sampling locations
Be
nze
ne
(p
pb
)
max
median
min
observed
Rue de Rennes (regular canyon)
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0
1
2
3
4
5
6
7
1 2 3 4 5 6 7 8 9 10 11Sampling locations
Be
nze
ne
(p
pb
)
max
median
min
observed
Avenue Leclerc (asymmetric canyon)
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Conclusions
• Urban air quality: Strong spatial variability
• BTX diffusive samplers: Efficient multi-site monitoring tool
• Regular canyons: Semi-empirical models might suffice
• Complex urban locations: Advanced models required
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Acknowledgments
Pr Bernard Fisher (Environment Agency)
Pr Koulis Pericleous (Univ. of Greenwich)
Dr Norbert Gonzalez-Flesca (INERIS)
Mairie de Paris