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© 2016. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Within the framework of air quality studies at the megacity scale, highly time-resolved volatile organic compound (C2C8) measurements were performed in downtown Paris (urban background sites) from January to November 2010. This unique dataset included non-methane hydrocarbons (NMHCs) and aromatic/oxygenated species (OVOCs) measured by a GC-FID (gas chromatograph with a flame ionization detector) and a PTR-MS (proton transfer reaction – mass spectrometer), respectively. This study presents the seasonal variability of atmospheric VOCs being monitored in the French megacity and their various associated emission sources. Clear seasonal and diurnal patterns differed from one VOC to another as the result of their different origins and the influence of environmental parameters (solar radiation, temperature). Source apportionment (SA) was comprehensively conducted using a multivariate mathematical receptor modeling. The United States Environmental Protection Agency's positive matrix factorization tool (US EPA, PMF) was used to apportion and quantify ambient VOC concentrations into six different sources. The modeled source profiles were identified from near-field observations (measurements from three distinct emission sources: inside a highway tunnel, at a fireplace and from a domestic gas flue, hence with a specific focus on road traffic, wood-burning activities and natural gas emissions) and hydrocarbon profiles reported in the literature. The reconstructed VOC sources were cross validated using independent tracers such as inorganic gases (NO, NO2, CO), black carbon (BC) and meteorological data (temperature). The largest contributors to the predicted VOC concentrations were traffic-related activities (including motor vehicle exhaust, 15 % of the total mass on the annual average, and evaporative sources, 10 %), with the remaining emissions from natural gas and background (23 %), solvent use (20 %), wood-burning (18 %) and a biogenic source (15 %). An important finding of this work is the significant contribution from wood-burning, especially in winter, where it could represent up to 50 % of the total mass of VOCs. Biogenic emissions also surprisingly contributed up to 30 % in summer (due to the dominating weight of OVOCs in this source). Finally, the mixed natural gas and background source exhibited a high contribution in spring (35 %, when continental air influences were observed) and in autumn (23 %, for home heating consumption).

Details

Title
Seasonal variability and source apportionment of volatile organic compounds (VOCs) in the Paris megacity (France)
Author
Baudic, Alexia 1 ; Gros, Valérie 1 ; Sauvage, Stéphane 2 ; Locoge, Nadine 2   VIAFID ORCID Logo  ; Sanchez, Olivier 3 ; Sarda-Estève, Roland 1 ; Kalogridis, Cerise 4   VIAFID ORCID Logo  ; Petit, Jean-Eudes 5   VIAFID ORCID Logo  ; Bonnaire, Nicolas 1 ; Baisnée, Dominique 1 ; Favez, Olivier 6 ; Albinet, Alexandre 6   VIAFID ORCID Logo  ; Sciare, Jean 7 ; Bonsang, Bernard 1 

 LSCE, Laboratoire des Sciences du Climat et de l'Environnement, Unité Mixte CEA-CNRS-UVSQ, CEA/Orme des Merisiers, 91191 Gif-sur-Yvette, France 
 Mines Douai, Département Sciences de l'Atmosphère et Génie de l'Environnement (SAGE), 59508 Douai, France 
 AIRPARIF, Association Agréée de Surveillance de la Qualité de l'Air en Île-de-France, 75004 Paris, France 
 LSCE, Laboratoire des Sciences du Climat et de l'Environnement, Unité Mixte CEA-CNRS-UVSQ, CEA/Orme des Merisiers, 91191 Gif-sur-Yvette, France; now at: Institute of Nuclear Technology and Radiation Protection, Environmental Radioactivity Laboratory, National Center of Scientific Research Demokritos, 15310 Ag. Paraskevi, Attiki, Greece 
 LSCE, Laboratoire des Sciences du Climat et de l'Environnement, Unité Mixte CEA-CNRS-UVSQ, CEA/Orme des Merisiers, 91191 Gif-sur-Yvette, France; INERIS, Institut National de l'EnviRonnement Industriel et des risqueS, DRC/CARA/CIME, Parc Technologique Alata, BP2, 60550 Verneuil-en-Halatte, France; now at: Air Lorraine, 20 rue Pierre Simon de Laplace, 57070 Metz, France 
 INERIS, Institut National de l'EnviRonnement Industriel et des risqueS, DRC/CARA/CIME, Parc Technologique Alata, BP2, 60550 Verneuil-en-Halatte, France 
 LSCE, Laboratoire des Sciences du Climat et de l'Environnement, Unité Mixte CEA-CNRS-UVSQ, CEA/Orme des Merisiers, 91191 Gif-sur-Yvette, France; now at: Energy Environment Water Research Center (EEWRC), The Cyprus Institute, Nicosia, Cyprus 
Pages
11961-11989
Publication year
2016
Publication date
2016
Publisher
Copernicus GmbH
ISSN
16807316
e-ISSN
16807324
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2414100659
Copyright
© 2016. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.