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Users & Applications


GasSim was developed and marketed by Golder Associates on behalf of the Environment Agency of England and Wales, and now has a user community of around 500 people worldwide.

Currently, the primary application of GasSim has been the landfill gas risk assessment component of landfill permit applications within the context of UK legislation. These Regulations implement the EC Landfill Directive and the EC Integrated Pollution Prevention and Control Directive.

There are other specific uses which use only part of the model, including resource assessment, air quality and odour assessment, greenhouse gas impact assessment and pollution inventory reporting.

The worldwide user base includes;

  • Regulators;
  • Consultants;
  • Waste Management Companies;
  • Renewable Power Companies;
  • Universities.

Users are located in the following countries;

  • United Kingdom
  • Croatia
  • Finland
  • France
  • Ireland
  • Italy
  • Netherlands
  • Norway
  • Spain
  • Sweden
  • Australia
  • China
  • Hong Kong
  • Jordan
  • South Africa
  • USA

GasSim 2.5 is the most recent version of GasSim available. Previous versions of GasSim are no longer supported on the helpdesk.

GasSimLite is fully functioning freeware based on GasSim version 1.5.