This chapter summarises the information in the preceding chapters, which builds on the outcomes of an Expert Workshop held by the UNECE Task Force on Reactive Nitrogen in October 2010 in Paris, France, which examined the state-of-the-art regarding abatement measures for ammonia in agriculture. Cost information is provided by farm activity and abatement measure, including a discussion on integrated nitrogen management at the farm scale. The chapter also reports the conclusions of the Expert Workshop, noting the finding that in many cases the costs for the abatement techniques were cheaper than previously estimated. Wider policy contexts of the information are explored, including identifying priority measures for ammonia abatement and links to Annex IX of the Gothenburg Protocol.