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BAFU Ozone Summer 2003

Duration: 2003-2004

Contact: Sebnem Aksoyoglu, sebnem.aksoyoglu@psi.ch

Scope of project

We investigated how emissions and ozone levels would have changed during a heat wave period as in summer 2003 if the maximum speed limit on Swiss motorways were decreased from 120 to 80 km h-1.

Key findings

  • Hot and dry conditions in summer 2003 led to ozone levels that substantially exceeded the Swiss ambient air quality standard. We investigated how emissions and ozone levels would have changed in this period if the maximum speed limit on Swiss motorways were decreased from 120 to 80 km h-1. The model results suggested that nitrogen oxides (NOx) emissions from road traffic would decrease by about 4% and volatile organic compounds (VOC) emissions would not change significantly due to speed reduction.
  • The effect of reduced speed limit on peak ozone levels would be less than 1%.
  • We conclude from these results that temporary measures enforced in restricted regions are not sufficiently effective if the potential of emission reduction is less than 50%. More important for the ozone reductions in Switzerland are the long-term emission developments in Switzerland, in the adjacent countries and, to some extent, in the whole northern hemisphere.

Publications

Journal Articles

Keller, J., Andreani-Aksoyoglu, S., M. Tinguely, J. Flemming, J. Heldstab, M. Keller, R. Zbinden, and Prevot, A. S. H.: The impact of reducing the maximum speed limit on motorways in Switzerland to 80 km h-1 on emissions and peak ozone
Environ. Model. Softw., 23, 322-332, 2008.
DOI: http://dx.doi.org/10.1016/envsoft.2007.04.008

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BAFU

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Laboratory of Atmospheric Chemistry
Forschungsstrasse 111
5232 Villigen PSI
Switzerland
 


Mohr Claudia


Laboratory Head LAC
Claudia Mohr
Telephone: +41 56 310 54 77
E-mail: claudia.mohr@psi.ch

 


Indlekofer Claudia


Assistant
Claudia Indlekofer
Telephone: +41 56 310 25 22
E-mail: claudia.indlekofer@psi.ch

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