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Volume 17, issue 20 | Copyright

Special issue: The Modular Earth Submodel System (MESSy) (ACP/GMD inter-journal...

Atmos. Chem. Phys., 17, 12813-12826, 2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 27 Oct 2017

Research article | 27 Oct 2017

Impact of agricultural emission reductions on fine-particulate matter and public health

Andrea Pozzer1, Alexandra P. Tsimpidi1, Vlassis A. Karydis1, Alexander de Meij2,a, and Jos Lelieveld1,3 Andrea Pozzer et al.
  • 1Atmospheric Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany
  • 2Noveltis, Sustainable Development, Rue du Lac, 31670 Labege, France
  • 3Energy, Environment and Water Research Center, The Cyprus Institute, Nicosia, Cyprus
  • anow at: MetClim, Varese, Italy

Abstract. A global chemistry-climate model has been used to study the impacts of pollutants released by agriculture on fine-particulate matter (PM2.5), with a focus on Europe, North America, East and South Asia. Simulations reveal that a relatively strong reduction in PM2.5 levels can be achieved by decreasing agricultural emissions, notably of ammonia (NH3) released from fertilizer use and animal husbandry. The absolute impact on PM2.5 reduction is strongest in East Asia, even for small emission decreases. Conversely, over Europe and North America, aerosol formation is not immediately limited by the availability of ammonia. Nevertheless, reduction of NH3 can also substantially decrease PM2.5 concentrations over the latter regions, especially when emissions are abated systematically. Our results document how reduction of agricultural emissions decreases aerosol pH due to the depletion of aerosol ammonium, which affects particle liquid phase and heterogeneous chemistry. Further, it is shown that a 50% reduction of agricultural emissions could prevent the mortality attributable to air pollution by  ∼ 250 000 peopleyr−1 worldwide, amounting to reductions of 30, 19, 8 and 3% over North America, Europe, East and South Asia, respectively. A theoretical 100% reduction could even reduce the number of deaths globally by about 800000 per year.

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This study shows that agricultural emissions are important for air quality and their reduction can effectively reduce the concentration of fine particles and their associated premature mortality. Therefore, emission control policies, especially in North America and Europe, should also involve strong ammonia emission decreases to optimally reduce fine-particle concentration.
This study shows that agricultural emissions are important for air quality and their reduction...