BREEZE - The World Leader in Air and Haz Dispersion Models for over 25 years

BREEZE HAZ Dispersion (DEGADIS, SLAB, AFTOX, INPUFF) Modeling SoftwareHAZ Dispersion

BREEZE HAZ DISPERSION, the most comprehensive software package for modeling accidental releases of toxic chemicals. HAZ DISPERSION includes DEGADIS, SLAB, AFTOX, and INPUFF dispersion models, as well as BREEZE's proprietary source-term model called EXPERT. This package is ideal for emergency response and planning and modeling accidental release scenarios for regulatory programs, such as the U.S. EPA's Risk Management Program (RMP).

 BREEZE HAZ DISPERSION Models: a dense-gas dispersion model developed by the U.S. Coast Guard/U.S. EPA and is used to determine hydrocarbon flammability levels and toxic concentrations from episodic dense-gas/aerosol releases. Source types include evaporating pools, ground-level gasesous/aerosol and vertical jet releases. a dispersion model that simulates the atmospheric dispersion of denser-than-air releases. The model was developed by the Lawrence Livermore National Laboratory under the support of the U.S. Department of Energy, the USAF Engineering and Services Center, and the American Petroleum Institute. Source types include evaporating pools, vertical/ horizontal jets, and stack releases. a Gaussian puff/plume model developed by the U.S. Air Force to model neutrally buoyant gaseous releases. Both gas and liquid evaporating to a neutrally buoyant gas) sources can be modeled with AFTOX. Source types include point, area, and liquid spill sources. an integrated Gaussian puff model developed by the U.S. EPA to model buoyant or neutrally buoyant gas releases from a stack. The release duration can be specified as either finite or continuous. Source types include stacks and surface-based releases.

BREEZE HAZ Source-term Model:
EXPERT is a proprietary model developed by BREEZE to calculate source-term parameters needed by dispersion models.  EXPERT calculates the key model input parameters (e.g., pool evaporation rate, emission rate, etc.) based on user-specified observables such as chemical property data and storage, release, and ambient meteorological conditions. EXPERT then recommends an appropriate dispersion model based upon the calculated results and seamlessly transfers these results to the dispersion model.  The EXPERT algorithms are based primarily upon the EPA's document entitled "Guidance on the Application of Refined Dispersion Models to Hazardous/Toxic Air Pollutant Releases", April 1993.