Comparison between weekend and weekday ozone concentration in large cities in France |
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| Institution: | 1. Pediatric Infectious Disease Unit, Department of Pediatrics, Hacettepe University Faculty of Medicine, Ankara, Turkey;2. Pediatric Endocrinology Unit, Department of Pediatrics, Hacettepe University Faculty of Medicine, Ankara, Turkey;3. Department of Medical Microbiology, Hacettepe University Faculty of Medicine, Ankara, Turkey;1. Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, Wis;2. Department of Biostatistics and Medical Informatics, University of Wisconsin School of Medicine and Public Health, Madison, Wis;3. Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wis;4. Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, Madison, Wis;5. Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wis;6. Department of Pharmacy, University of Wisconsin School of Medicine and Public Health, Madison, Wis;1. School of Mathematical Sciences, Capital Normal University, Beijing, 100048, China;2. Beijing Center for Mathematics and Information Interdisciplinary Sciences, Beijing, 100048, China;1. College of Electrical, Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China;2. College of Electronics, Communication and Physics, Shandong University of Science and Technology, Qingdao 266590, China;3. Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, China;4. School of Physics Science and Engineering, Institute for Advanced Study, Tongji University, Shanghai 200092, China;1. Department of Geobotany, University of Trier, 54296, Trier, Germany;2. Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH, D-53113, Bonn, Germany;3. ARGANS Ltd, Sophia-Antipolis, France |
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| Abstract: | This paper examines ozone data from five large French cities (Marseilles, Lyon, Paris, Strasbourg and Toulouse) in spring and summer over a three-year period to study the possible influence of local primary pollutant emissions. In these cities the level of traffic emission varies according to the day of the week. There is a decrease of about 25% in traffic emissions between non-consecutive Tuesdays and Sundays. Traffic emissions on Fridays are about 40% more than on non-consecutive Sundays whereas they seem to be similar for non-consecutive Tuesdays and Thursdays. Despite this variation in traffic emissions between Fridays and Sundays, 85% of daily ozone maxima are identical for all days compared; in 15% of cases, percentiles of daily ozone maxima vary by about 20% at the most. This difference is observed for the highest values of daily ozone maxima that we can find both in rural and urban sites. Marseilles is the most pollution-sensitive city; every site of this area is concerned, which gives a regional origin to ozone variability. In the less-populated Toulouse area, differences between ozone on Fridays and Sundays are less significant. Our results show the importance of advection phenomena of ozone. It calls into question strategies of local reductions in traffic during ozone episodes. |
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