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AMI offers the following state of the science health risk assessment (HRA) models. These models belong to the ACE (Assessment of Chemical Exposure) series and are suitable for air toxics HRA from a single facility as well as several facilities in a cumulative analysis. They have fully implemented the guidelines of regulatory agencies, are easy to use and have been applied to hundreds of facilities in the U.S. and abroad.


A health risk assessment model for California's AB2588 Air Toxics Hot Spots Program 


A health risk assessment model for hazardous waste combustion facilities


A health risk assessment model for mercury emissions 

AMI has also extensive experience with other air quality and risk assessment models, including the following:

AERMOD Modeling System
 - A steady-state plume model that incorporates air dispersion based on planetary boundary layer turbulence structure and scaling concepts, including treatment of both surface and elevated sources, and both simple and complex


CALPUFF Modeling System- A non-steady-state puff dispersion model that simulates the effects of time- and space-varying meteorological conditions on pollution transport, transformation, and removal. CALPUFF can be applied for long-range transport and for complex terrain. 

Community Multi-scale Air Quality (CMAQ) - Developed by U.S. EPA, the photochemical Eulerian CMAQ model includes state-of-the-science capabilities for conducting urban to regional scale simulations of multiple air quality issues, including tropospheric ozone, fine particles, toxics, acid deposition, and visibility degradation.


Comprehensive Air quality Model with extensions (CAMx) - The photochemical Eulerian CAMx model simulates air quality over many geographic scales. The model treats a wide variety of inert and chemically active pollutants, including ozone, particulate matter, inorganic and organic PM2.5/PM10, and mercury and other toxics. CAMx also has plume-in-grid and source apportionment capabilities.


HARP This multipathway health risk assessment model developed by California Air Resources Board for AB2588 and permit applications. Its latest version, HARP 2, has three modules: The Emissions Inventory Module (EIM), Air Dispersion Modeling and Risk Tool (ADMRT) and Risk Assessment Standalone Tool (RAST).


TRACE - The photochemical Lagrangian (trajectory) TRACE model was developed by AMI. It simulates the effects of ozone and PM precursors emitted by a single source or multiple sources in a 2-dimensional wall of cells. The model has been used in data-poor environments such as offshore oil and gas development and power plant siting in complex terrain.


WRF-CHEM This three-dimensional photochemical model has been developed at NCAR and other U.S. national research laboratories. It simulates both the meteorology and photochemical processes of oxidants and aerosols.

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