Summary
This assessment documents the rising relative significance of agricultural sources in European NOx emissions, driven by stagnant progress in reducing farm-based emissions whilst combustion sources achieved substantial reductions. The authors examine the emission factors and methodologies currently embedded in European atmospheric pollution inventories, identifying considerable data gaps and uncertainty in agricultural soil emission estimates that limit the precision of inventory reporting.
UK applicability
As a constituent of the 42-country European analysis, the United Kingdom's agricultural NOx contribution and inventory methodology are likely included; the findings inform UK air quality policy and agricultural emissions reporting under EU and UNECE protocols, though country-specific validation of UK emission factors would be necessary for targeted mitigation.
Key measures
Agricultural NOx emissions as a percentage of total European NOx emissions; trends in sectoral emissions 1990–2017; emission factor uncertainty and data gaps; country-level inventory comparisons
Outcomes reported
The study quantified the contribution of agricultural soil and manure management to total European NOx emissions, and evaluated the validity and uncertainty of emission factors used in atmospheric pollution inventories across 42 European countries.
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