Impact de l’agriculture sur la qualité de l’air

Abstract : Like all activity sectors, agriculture is responsible for emissions of many pollutants and particularly gaseous precursors of particulate matter, as ammonia. The French official emission inventory indicates that more than 97% (CITEPA, 2015) of anthropogenic ammonia emissions 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. Ammonia, under favorable weather conditions, reacts with nitrogen oxides 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 lowest 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, this decrease is even more important if other measures to reduce nitrogen oxides emissions are taken. Long-term policies to weaken ammonia emissions should reduce the number of exceedances of the PM10 and PM2.5 limit values. Other components like soil particles are also issued from agriculture, they are generally larger than 2.5 μm in diameter. Anyway, agriculture can play an important role in air quality management.
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Bertrand Bessagnet, Maxime Beauchamp, Florian Couvidat, Frédérik Meleux, Olivier Favez, et al.. Impact de l’agriculture sur la qualité de l’air. Rapport Scientifique INERIS, 2016, 2015-2016, pp.39-40. ⟨ineris-01869624⟩

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