ALOHA Software

Three-colored threat zone estimate for a fictional chlorine release, as shown on an ALOHA grid.

ALOHA® (Areal Locations of Hazardous Atmospheres) is the hazard modeling program for the CAMEO® software suite (Computer-Aided Management of Emergency Operations), which is used widely to plan for and respond to chemical emergencies.

ALOHA allows you to enter details about a real or potential chemical release, and then it will generate threat zone estimates for various types of hazards. ALOHA can model toxic gas clouds, flammable gas clouds, Boiling Liquid Expanding Vapor Explosions (BLEVEs), jet fires, pool fires, and vapor cloud explosions. The threat zone estimates are shown on a grid in ALOHA, and they can also be plotted on maps in MARPLOT® (Mapping Application for Response, Planning, and Local Operational Tasks), Esri's ArcMap, Google Earth, and Google Maps. The red threat zone represents the worst hazard level, and the orange and yellow threat zones represent areas of decreasing hazard.

Download ALOHA

Visit the National Oceanic and Atmospheric Administration's ALOHA webpage to download ALOHA for Windows and Mac operating systems.

Learn About ALOHA

To learn how to use ALOHA refer to the "Help" function within the software and visit the CAMEO Training and Events webpage. ALOHA's help topics include an example problem that you can work through to familiarize yourself with the program. You can also download the ALOHA Examples, which has three additional step-by-step fictional example scenarios.

For additional information on using ALOHA (such as frequent questions, a Level of Concern guide, and the Ask. Dr. ALOHA articles), see the ALOHA pages on the National Oceanic and Atmospheric Administration Office of Response and Restoration website.

For information about ALOHA's models and equations, as well as other background information, download the ALOHA Technical Documentation.

For a brief summary of the ALOHA program and its capabilities, download the ALOHA fact sheet.

Get Help

You can report software bugs or obtain additional assistance by emailing the RMP Reporting Center (RMPRC@epacdx.net), or by calling the CAMEO help desk at (703) 227-7650 on weekdays from 8 AM to 4:30 p.m., Eastern Time.