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Caractéristiques et origines principales des épisodes de pollution hivernaux aux PM10 en France

Abstract : This paper aims at gaining an insight into the PM10 daily threshold (50 micro g/m3) exceedances measured by French regional air quality monitoring networks for the last four years. As almost three quarter of these exceedances happens to occur between November and April, we focus here on such winter (broadly speaking) pollution episodes. The deployment of monitoring devices allowing for a proper account of semi-volatile material within PM10 was achieved concomitantly to the development particulate pollution episodes largely influenced by ammonium nitrate (which is semi-volatile) in March-April 2007. Since then, such pollution events are frequently observed at this period of the year, notably due to stable meteorological conditions favoring the condensation of semi-volatile material into the particulate phase along with the resumption of manure spreading, which constitutes a major source of ammonium nitrate gaseous precursors (at least at some points of the year). Such pollution events, which are also related to combustion emissions (among which mobile sources) are typically preceded, from November to February, by frequent daily threshold exceedances with potentially significant influences of biomass burning (e.g. residential wood burning). The winter period is also impacted by long range transport episodes, corresponding notably to increases of ammonium sulfate relative abundances within PM10. Moreover, as traffic sites are generally the first ones showing PM10 exceedances due the increment of direct emissions and resuspension processes, mobile sources are also considered as a major target for action plans. Finally, it is underlined that the occurrence of daily threshold exceedances is highly influenced by meteorological conditions, so that the yearly number of these exceedances shows well-marked inter-annual variations, with 2009 and 2011 (and 2012, but not shown here) being significantly more polluted than 2008 and 2010. The on-going development of efficient forecasting systems still suffer lacks of detailed emission inventories and strong knowledge on the physical and chemical transformation processes of particles and their gaseous precursors within the boundary layer.
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Submitted on : Friday, March 21, 2014 - 2:28:37 PM
Last modification on : Thursday, September 1, 2022 - 11:12:23 AM


  • HAL Id : ineris-00963404, version 1
  • INERIS : EN-2012-414


Olivier Favez, Jean-Eudes Petit, Bertrand Bessagnet, Frédérik Meleux, Laura Chiappini, et al.. Caractéristiques et origines principales des épisodes de pollution hivernaux aux PM10 en France. Pollution Atmosphérique : climat, santé, société, Le Kremlin Bicêtre : Revue Pollution atmosphérique, 2012, pp.163-181. ⟨ineris-00963404⟩



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