EMEP4UK was a Defra and CEH partnership-funded project that developed and delivered an off-line atmospheric-chemistry transport model (ACTM) based on the EMEP MSC-W model. The model, termed EMEP4UK, is capable of representing UK atmospheric composition in greater detail than larger i.e. European-scale models, with the ability to simulate hourly air pollution interactions over decadal time scales using a 5km grid or finer. The Weather Research Forecast (WRF) model was used as the main meteorological driver. More information on this calculated meteorological input data can be found here.

The current version of the EMEP4UK is rv4.4, which is based on the EMEP MSC-W rv4.4. This model core code is open source and available for download from the EMEP website. The EMEP MSC-W model is currently used to support European policy development by the UNECE Convention on Long-range Transboundary Air Pollution (CLRTAP) and the European Commission. EMEP4UK is an ideal tool to analyse the impact of policies on the UK with the benefit of higher resolution which is, for example, critical to account for the spatial allocation of wet deposition.

EMEP4UK simulates hourly to annual average atmospheric composition and deposition of various pollutants; including PM10, PM2.5, secondary organic aerosols (SOA), elemental carbon (EC), secondary inorganic aerosols (SIA), SO2, NH3, NOx, and O3. Dry and wet deposition of pollutants are routinely calculated by the model. More information on the horizontal and vertical resolution and the domain set up of the model can be found here.