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In situ, satellite measurement and model evidence on the dominant regional contribution to fine particulate matter levels in the Paris megacity

Matthias Beekmann 1 A.S.H. Prévôt 2 F Drewnick 3 J Sciare 4 N Pandis 5 H.A.C. Denier van der Gon 6 M Crippa 7 F Freutel 3 L Poulain 8 V Ghersi 9 E Rodriguez 10 S Beirle 3 P Zotter 7 S.-L von der Weiden-Reinmüller 3 M Bressi 4 C Fountoukis 11 H Petetin 1, 9 S Szidat 12 Johannes Schneider 3 A Rosso 9 I El Haddad 7 A Megaritis 11 Qj Zhang 13, 1 V Michoud 14, 1 J. G. Slowik 7 S Moukhtar 9 P Kolmonen 10 A Stohl 15 S Eckhardt 15 A. Borbon 1 V Gros 4 Nicolas Marchand 16 J.-L. Jaffrezo 17 Alfons Schwarzenboeck 18 A Colomb 1, 18 A Wiedensohler 8 S Borrmann 19, 3 M Lawrence 3 A Baklanov 20 U Baltensperger 7
Abstract : Published by Copernicus Publications on behalf of the European Geosciences Union. 9578 M. Beekmann et al.: Evidence for a dominant regional contribution to fine particulate matter levels Abstract. A detailed characterization of air quality in the megacity of Paris (France) during two 1-month intensive campaigns and from additional 1-year observations revealed that about 70 % of the urban background fine particulate matter (PM) is transported on average into the megacity from upwind regions. This dominant influence of regional sources was confirmed by in situ measurements during short intensive and longer-term campaigns, aerosol optical depth (AOD) measurements from ENVISAT, and modeling results from PMCAMx and CHIMERE chemistry transport models. While advection of sulfate is well documented for other megacities, there was surprisingly high contribution from long-range transport for both nitrate and organic aerosol. The origin of organic PM was investigated by comprehensive analysis of aerosol mass spectrometer (AMS), radio-carbon and tracer measurements during two intensive campaigns. Primary fossil fuel combustion emissions constituted less than 20 % in winter and 40 % in summer of carbonaceous fine PM, unexpectedly small for a megacity. Cooking activities and, during winter, residential wood burning are the major primary organic PM sources. This analysis suggests that the major part of secondary organic aerosol is of modern origin , i.e., from biogenic precursors and from wood burning. Black carbon concentrations are on the lower end of values encountered in megacities worldwide, but still represent an issue for air quality. These comparatively low air pollution levels are due to a combination of low emissions per inhabitant , flat terrain, and a meteorology that is in general not conducive to local pollution build-up. This revised picture of a megacity only being partially responsible for its own average and peak PM levels has important implications for air pollution regulation policies.
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Matthias Beekmann, A.S.H. Prévôt, F Drewnick, J Sciare, N Pandis, et al.. In situ, satellite measurement and model evidence on the dominant regional contribution to fine particulate matter levels in the Paris megacity. Atmospheric Chemistry and Physics, European Geosciences Union, 2015, 15 (16), pp.9577-9591. ⟨10.5194/acp-15-9577-2015⟩. ⟨insu-01285053⟩

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