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ALOHA: Areal Location Of Hazardous Atmospheres

ALOHA (Areal Locations of Hazardous Atmospheres) is a program for the evaluation of gas transport and dispersion in atmosphere in emergency conditions. It takes into account both the toxicological and physical properties of the pollutant and the characteristics of the site under study, such as the the atmospheric conditions and the release conditions. The package includes a library with the main properties of about 700 substances and displays graphically the most significant results of the simulations.
ALOHA uses two different models, depending on the type of pollutant: a gaussian plume model for light gases and a heavy gas model due to Spicer and Havens (1989). It assumes a flat terrain, no chemical reaction, no fire, stationary emission conditions (a time varying source is modelled as a sequence of constant releases). The main feature of the model is the computational speed.


area: air quality
objectives: emergency management, remediation planning
description: accidental release, toxicological impact, fast response, light gases, heavy gases, short term, short range, inactive pollutant, gaussian plume


ALOHA is distributed by the
National Safety Council (NSC)
1019 19th Street, N.W., Suite 401
Washington, D.C. 20036-5105
202-293.2270/FAX 202-293.0032


National Safety Council (NSC)
1019 19th Street, N.W., Suite 401
Washington, D.C. 20036-5105
202-293.2270/FAX 202-293.0032


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  • Wilson, D.J., 1987. Stay indoors or evacuate to avoid exposure to toxic gas? Emergency Preparedness Digest 14(1): 19-24.



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