Le rôle de l’agriculture sur les concentrations en particules dans l’atmosphère et l’apport de la modélisation

Abstract : Like all activity sectors, agriculture is responsible for the emission of many pollutants and particularly gaseous precursors of particulate matter, it is characterized by very high ammonia emissions. The French official emission inventory indicates that more than 97% (CITEPA, 2015) of anthropogenic emissions of this compound are due to agriculture (mainly due to breeding and nitrogen fertilizers applications). Ammonia combined with nitric acid is the source of secondary particles formation into the atmosphere contributing to the total particle load. Other components like soil particles are also issued from agriculture, they are generally greater than 2.5 μm in diameter. Thus, agriculture has an important role in air quality. Ammonia, under favorable weather conditions, reacts with the nitric acid and forms ammonium nitrate. During pollution episodes, this compound can represent over 50% of the PM10 mass. Anticyclonic situations conditions in late winter favor the accumulation of pollutants in the lower layers of the atmosphere and the formation of ammonium nitrate. Scenario simulations using air quality models show that ammonia emission reductions lead to a significant reduction in ammonium nitrate concentrations, the decrease is even more important if other measures to reduce nitrogen oxides emissions are taken. Long-term policies to weaken ammonia emissions will reduce the number of exceedances of PM10 and PM2.5 limit values.
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Submitted on : Monday, August 6, 2018 - 3:57:30 PM
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  • HAL Id : ineris-01854326, version 1

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Bertrand Bessagnet, Frédérik Meleux, Olivier Favez, Laurent Menut, Maxime Beauchamp, et al.. Le rôle de l’agriculture sur les concentrations en particules dans l’atmosphère et l’apport de la modélisation. Pollution Atmosphérique : climat, santé, société, Le Kremlin Bicêtre : Revue Pollution atmosphérique, 2016, pp.153-165. ⟨ineris-01854326⟩

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