CERC — Environmental Software and Services

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World leading software for modelling industrial air pollution

What is ADMS 5?

ADMS 5 is a dispersion model used to model the air quality impact of existing and proposed industrial installations. Current and future air quality can be assessed with respect to the air quality standards such as the EU Air Quality Directive, UK Air Quality Strategy, US National Ambient Air Quality Standards (NAAQS), Chinese Class I, II and III and WHO guidelines.

Typical applications include:

  • permitting/IPPC authorisations,
  • stack height determination,
  • odour modelling,
  • environmental impact assessments and
  • safety and emergency planning.

Who uses ADMS 5?

The dispersion model ADMS 5 is currently used in many countries worldwide. Users of ADMS 5 include:

  • over 130 individual company licence holders in the United Kingdom,
  • regulatory authorities including the UK Health and Safety Executive (HSE),
  • Environment Agency in England,
  • Scottish Environmental Protection Agency (SEPA) in Scotland,
  • Northern Ireland Environment Agency (NIEA) in Northern Ireland,
  • Natural Resources Wales,
  • government organisations including the Food Standards Agency (United Kingdom),
  • users in other European countries, Asia, Australia, North America, Africa and the Middle East.

Why use ADMS 5?

ADMS 5 is a new generation Gaussian plume air dispersion model, which means that the atmospheric boundary layer properties are characterised by two parameters:

  • the boundary layer depth, and
  • the Monin-Obukhov length

rather than in terms of the single parameter Pasquill-Gifford class.

Dispersion under convective meteorological conditions uses a skewed Gaussian concentration distribution (shown by validation studies to be a better representation than a symmetrical Gaussian expression).

The ADMS 5 model includes:

Model options ADMS 5 has a number of model options including: dry and wet deposition; NOx chemistry; impacts of hills, variable roughness, buildings and coastlines; puffs; fluctuations; odours; radioactivity decay (and γ-ray dose); condensed plume visibility; time varying sources and inclusion of background concentrations.
Meteorological pre-processor ADMS 5 has an in-built meteorological pre-processor that allows flexible input meteorological data both standard and more specialist. Hourly sequential and statistical data can be processed, and all input and output meteorological variables are written to a file after processing.
User-defined outputs The user defines the pollutant, averaging time (which may be an annual average or a shorter period), which percentiles and exceedence values to calculate, whether a rolling average is required or not and the output units. The output options are designed to be flexible to cater for the variety of air quality limits, which can vary from country to country, and are subject to revision.
Visualisation ADMS 5 includes the ADMS Mapper: an integrated mapping tool for displaying and editing source data, buildings and receptor locations and viewing results. The model has links to the Surfer contour-plotting package, in addition to ArcGIS and MapInfo Professional Geographical Information System (GIS) software. The GIS links can be used to enter and display input data, and display output, usually as colour contour plots.
Terrain converter Utilities are available for creating terrain files for Britain, France, Northern Ireland and Republic of Ireland.

ADMS features contrasted with US-EPA model AERMOD

Meteorological pre-processor Yes Yes
Boundary-layer structure h, LMO scaling h, LMO scaling
Plume rise Advanced integral model Briggs empirical expressions
Concentration distribution Advanced Gaussian Advanced Gaussian
Complex effects    
Buildings ADMS buildings module1 PRIME buildings module1
Complex terrain Based on calculation of flow field and turbulence field by FLOWSTAR model Interpretation between identified representation of plume flow displacement over terrain (neutral), plume inspection (stable)
Deposition (wet and dry) Yes Yes
Chemistry Reaction of NO with O3, photolysis of NO2, amine chemisty2 Ozone limiting or plume volume molar ratio models
Other options    
Modelling the effect of wind turbines on dispersion Yes No
Concentration fluctuations Yes No
Visible plumes Condensed plume visibility No
Temperature and humidity In-plume temperature and humidity output No
Radioactivity Radioactive decay / γ-ray dose; decay chain database Simple decay
Puff model Yes No
Coastline module Yes No
Marine boundary layer Yes No
Input of vertical profiles of meteorological data Yes Yes

1 See A. Robins,2000:A discussion of the building modules in ADMS 3 and PRIME.(.pdf, <1MB)
2 Not in standard model.

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