Most research to date has considered trans-boundary atmospheric pollution and climate change separately, even though they share many common drivers and methods of mitigation. There is a particular dearth of work in the UK on these linkages. Such work is important because (i) synergies and pitfalls in policy terms may be identified, and (ii) cost-effective strategies may be devised which distribute emission abatement efforts between pollutants and countries in such a way as to deliver on both greenhouse gas mitigation and air pollution reduction targets. This project seeks to develop the ability of the Community Integrated Assessment System (CIAS) being developed at Tyndall to model the interactions between climate and air pollution policies.