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

Monitoring Sites in Paris

Rennes Voltaire

Leclerc

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

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)

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

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

Street Canyon Modelling

Dispersion Models: OSPM - AEOLIUS - STREET

Emission Factors: Buckland - IMPACT - Touaty

Meteorological Data: Montsouris - St. Jacques - Orly Airport

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)

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)

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)

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

Acknowledgments

Pr Bernard Fisher (Environment Agency)

Pr Koulis Pericleous (Univ. of Greenwich)

Dr Norbert Gonzalez-Flesca (INERIS)

Mairie de Paris

sotiris.vardoulakis@lewes.gov.uk