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Assessing the contribution of soil NOxemissions to European atmospheric pollution

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  • U. Skiba, Centre for Ecology and Hydrology
  • ,
  • S. Medinets, Odessa National University
  • ,
  • L. M. Cardenas, Rothamsted Research
  • ,
  • E. J. Carnell, Centre for Ecology and Hydrology
  • ,
  • N. J. Hutchings
  • B. Amon, Leibniz Institute for Agricultural Engineering and Bioeconomy, University of Zielona Gora

Atmospheric NOx concentrations are declining steadily due to successful abatement strategies predominantly targeting combustion sources. On the European continent, total NOx emissions fell by 55% between 1990 and 2017, but only modest reductions were achieved from the agricultural sector; with 7.8% from 20 Eastern European countries and 19.1% from 22 Western European countries. Consequently, the share of agricultural NOx emissions for these 42 European countries have increased from 3.6% to 7.2%. These values are highly uncertain due to serious lack of studies from agricultural soils and manure management. The emission factor (EFNO 1.33%), currently used for calculating soil NOx emissions from European agricultural categories 'N applied to soils' and 'manure management' was evaluated here by including recently published data from temperate climate zones. The newly calculated EFNO (average 0.60%, 0.0625th%/0.5475th%, n = 65 studies) is not notably different from the current value, given the large uncertainties associated with the small pool of studies, and therefore continued use of EFNO (1.33%) is recommended until more data become available. An assessment of the contribution of agricultural and non-agricultural NOx sources found that of the 42 European countries, the 8 most populated countries achieved considerable reductions (1990-2017) from categories 'non-agricultural sources' (55%), 'N applied to soils' (43%) and 'manure management' (1.2%), compared to small reductions from the remaining 34 countries. Forests are also large sources of soil NOx. On average, emissions from Eastern European forests were 4 times larger than from 'N applied agricultural soil', whereas Western European NOx emissions from 'N applied agricultural soil' were two times larger than from forest soils. Given that non-agricultural sources of NOx continue to decline, soil related emissions from agriculture, forests and manure management become more important, and require rigorous investigation in order to improve atmospheric pollution forecasts.

TidsskriftEnvironmental Research Letters
StatusUdgivet - feb. 2021

Bibliografisk note

Funding Information:
This work was supported by DEFRA (UK), the GEF-UNEP funded ‘Towards INMS’ project (www.inms.international), and the policy support agreement between Aarhus University and the Danish Government. We wish to thank Dr J Webb for his contribution regarding EEA emission factors. The views expressed in this work are those of the authors and do not represent either DEFRA, GEF or UNEP views.

Publisher Copyright:
© 2021 The Author(s).

Copyright 2021 Elsevier B.V., All rights reserved.

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