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RoTAP (2012)<ref name="RoTAP 2012">

RoTAP. 2012. Review of transboundary Air Pollution: Acidification, Eutrophication, Ground Level Ozone and Heavy Metals in the UK. Contract Report to the Department for Environment, Food and Rural Affairs. ''Center for Ecology & Hydrology''.</ref> provides the most up to date synthesis of aerial deposition in the UK. Key findings in respect to long term monitoring and trends are summarized below. The work shows that there have been reductions in NOx and NH3 emissions, however the deposition of total nitrogen has not changed significantly during the last 20 years.
===Emissions===
* Emissions of nitrogen oxides (NOx) in recent years have not reduced as much as policy-makers intended, decreasing by 58% between 1970 and 2010. The UK met the NECD target for 2010, with emissions 5% below the target value
* Emissions of ammonia (NH3) decreased by 21% between 1990 and 2010. The UK met the NECD target for 2010, with emissions 4% below the target value

===Concentration and deposition===
* Concentrations of oxidised nitrogen in surface air (as nitrogen dioxide) have declined approximately in line with emission reductions (Figure 10)
* Concentrations of reduced nitrogen (as ammonia) have changed little since 1990 (Figure 11), with small increases in background areas and small reductions in regions dominated by pig and poultry sources. This is due to complexities regulating emissions from agriculture
* The total deposition of nitrogen (including both oxidised and reduced forms) in the UK '''has not changed significantly''' remaining almost the same (between 350–400kt–N per year) between for the last 20 years, RoTAP (2012)<ref name="RoTAP 2012"></ref>

[[Image:OR14047fig10.jpg|thumb|center|500px| '''Figure 10'''    UK emissions of NOx–N (Gg-N) (Defra, 2011; EIONET, 2012), projections based on the UEP38 energy scenario. Graph from RoTAP, 2012<ref name="RoTAP 2012"></ref>. ]]

[[Image:OR14047fig11.jpg|thumb|center|500px| '''Figure 11'''    UK emissions of NH3 (Gg-N) (Defra, 2011: EIONET, 2012), based on the UEP38 energy and ‘business as usual’ agriculture scenarios. From RoTAP, 2012<ref name="RoTAP 2012"></ref>. ]]
==References==
<References/>
[[Category:OR/14/047 Atmospheric deposition at groundwater dependent wetlands: implications for effective catchment management and Water Framework Directive groundwater classification in England and Wales | 07]]

OR/14/047 Trends for aerial deposition in the UK - Revision history

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Geosource>Ajhil at 08:27, 25 February 2016