The EMEP4UK modelled daily atmospheric composition

The European Monitoring and Evaluation Program Unified Model for the UK (EMEP4UK) simulates the year 2001 to 2014 UK daily average atmospheric composition at a horizontal resolution of 5 x 5 km2. The species included in this dataset are surface daily average concentrations of: nitric oxide (NO), nitrogen dioxide (NO2), particulate matter (PM10 and PM2.5), ammonia (NH3), nitric acid (HNO3), sulphur dioxide (SO2), ammonium (NH4+), nitrate (NO3-), sulphate (SO42-), PM2.5 organic matter, and ground level ozone (O3).

The EMEP4UK model framework consists of an atmospheric chemistry transport model (ACTM) which simulates hourly to annual average atmospheric composition and deposition of various pollutants and the weather research and forecast model (WRF). Pollutants simulated include fine particulate matter (PM10, PM2.5), secondary organic aerosols (SOA), elemental carbon (EC), secondary inorganic aerosols (SIA), sulphur dioxide (SO2), ammonia (NH3), nitrogen oxides (NOx), and ground level ozone (O3). Dry and wet deposition of pollutants are also generated by the EMEP4UK. WRF is used to calculate the required meteorological input data for the ACTM.

The version of EMEP4UK used to model the 2001-2014 dataset available here is based on the EMEP Meteorological Synthesizing Centre West (MSC-W) model version rv4.4.

Only the simulations for the years between 2002-2012 include data for from forest fire.
The emissions used for simulating the years 2013 and 2014 are the same as the year 2012 (updated date will be made available as soon as 2013 and 2014 national emission inventory data have been processed).
The calculated year 2001-2012 use a different version of the WRF model, moreover for the year 2013 and 2014 the WRF model setup was changed as the specific Humidity is no longer nudged with re-analysis in the WRF simulation.

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Supporting documentation

Format of the dataset : netCDF

This dataset is made available under the terms of the Open Government Licence

© Centre for Ecology & Hydrology (Natural Environment Research Council)

Acknowledgements required (third-party datasets used to drive the model): The WRF model calculated meteorology use the dataset from NCEP FNL Operational Model Global Tropospheric Analyses, continuing from July 1999. National Centers for Environmental Prediction/National Weather Service/NOAA/U.S. Department of Commerce. 2000, updated daily. NCEP FNL Operational Model Global Tropospheric Analyses, continuing from July 1999. Research Data Archive at the National Center for Atmospheric Research, Computational and Information Systems Laboratory. Emissions data from the EMEP emissions center (, and NAEI web site (


Study area
Temporal extent
2001-01-01    to    2014-12-30

Provenance & quality

The UK Automatic Urban and Rural monitoring Network (AURN) hourly data are used to verify the EMEP4UK model output:

Vieno, M., Dore, A. J., Stevenson, D. S., Doherty, R., Heal, M. R., Reis, S., Hallsworth, S., Tarrason, L., Wind, P., Fowler, D., Simpson, D., and Sutton, M. A.: Modelling surface ozone during the 2003 heat-wave in the UK, Atmospheric Chemistry and Physics, 10, 7963-7978, DOI 10.5194/acp-10-7963-2010, 2010

Vieno, M., Heal, M. R., Williams, M. L., Carnell, E. J., Nemitz, E., Stedman, J. R., and Reis, S.: The sensitivities of emissions reductions for the mitigation of UK pm2.5, Atmos. Chem. Phys., 16, 265-276, 10.5194/acp-16-265-2016, 2016.

The UK Acid Gases and Aerosols Network (AGANet) monthy data are also used to verify the EMEP4UK model output:

Vieno, M., Heal, M. R., Hallsworth, S., Famulari, D., Doherty, R. M., Dore, A. J., Tang, Y. S., Braban, C. F., Leaver, D., Sutton, M. A., and Reis, S.: The role of long-range transport and domestic emissions in determining atmospheric secondary inorganic particle concentrations across the UK, Atmos. Chem. Phys., 14, 8435-8447, 10.5194/acp-14-8435-2014, 2014

The EMEP4UK model have been evaluated against other models in the Defra organised model inter-comparison:

Carslaw, D. C.: Report: Defra deposition model evaluation analysis - Phase 1, London,, access 01/04/2015, 2011.
Carslaw, D. C.: Report: Defra regional and transboundary model evaluation analysis - Phase 1, London,, access 01/04/2015, 2011.

The EMEP MSC-W from which the EMEP4UK model is derived is routinely updated and validated in EU:

No further QA/QC is carried out.

Correspondence/contact details

Dr. Massimo Vieno
Centre for Ecology & Hydrology


Vieno, M.
Centre for Ecology & Hydrology

Other contacts

Environmental Information Data Centre
NERC Environmental Information Data Centre


Spatial representation type
Spatial reference system
Polar Stereographic::Polar Stereographic


Topic categories
Climatology / Meteorology / Atmosphere
ammonia (NH3) ammonium (NH4+) Ammonium particles,  Climate and climate change Environmental risk European Monitoring Evaluation Programme (EMEP),  Modelling Nitrate particles,  Nitrogen dioxide ozone (O3) Particulate organic matter,  Pollution Sulphate particles,  sulphur dioxide (SO2)
Atmospheric Conditions