Scenario modelling - spatial targeting of ammonia mitigation measures in Northern Ireland

This report describes the scenario modelling undertaken to test the potential impact of bundles of ammonia (NH3) mitigation measures on atmospheric emissions, concentrations and deposition as well as effects on sensitive vegetation, and, in particular, on designated sites (SACs, ASSIs). The scenarios tested both Northern Ireland-wide and spatially targeted options near designated sites. Ammonia is very reactive and effects are known to occur locally, close to emission sources, and spatial targeting has previously been shown in UK studies to be more cost-effective per unit of emission reduction than country-wide measures where reductions are spread more thinly over a much larger area (i.e. same overall emission reduction).