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Useful Links

Chemical Information

PAC/TEEL Data Sets and Tools

This website provides access to the current Protective Action Criteria (PAC) data set in several different formats—a searchable database, an Excel workbook, and a series of tables in PDF format.  PAC values are provided for over 3,300 chemicals that have AEGLs, ERPGs, or TEELs assigned to them.  The website also provides explanatory materials and access to archived versions of past PAC data sets.

Agency for Toxic Substances and Disease Registry (ATSDR) Chemical Mixtures Program

ATSDR's task is to develop new methodologies for evaluating the health effects of mixtures. They have developed a "Guidance Manual for the Assessment of Joint Toxic Action of Chemical Mixtures" that parallels the SCAPA Mixtures Methodology approach.

OECD Chemical Safety Directories and Databases

The Organization for Economic Cooperation and Development‘s (OECD) website provides links to useful chemical safety directories and chemical databases.  

Inter-Organization Programme for the Sound Management of Chemicals (IOMC)

The IOMC was established to strengthen cooperation and increase coordination in the field of chemical safety and meet long-term goals for the sound management of chemicals.   The IOMC Toolbox for Decision-Making in Chemicals Management is a key product.

Acute Exposure Guideline Levels

AEGLs are intended to describe the risk to humans resulting from once-in-a-lifetime, or rare, exposure to airborne chemicals. This EPA website provides links to AEGL data and program information.

AIHA Emergency Response Planning Committee

The American Industrial Hygiene Association’s (AIHA) Emergency Response Planning Committee develops guidelines for responding to airborne releases of potentially hazardous chemicals.  This website provides links to ERPG values for selected chemicals and other information pertaining to the committee’s work.

Consequence Assessment and Atmospheric Dispersion Modeling

Office of the Federal Coordinator for Meteorological Services and Supporting Research (OFCM)

Provides a variety of resources and links related to meteorological monitoring and atmospheric dispersion modeling.

National Atmospheric Release Advisory Center (NARAC)

NARAC provides tools and services to the Federal Government, that map the probable spread of hazardous material accidentally or intentionally released into the atmosphere.

DOE Central Registry of Safety Software Models  

The Central Registry currently contains software versions for seven toolbox codes that meet the DOE’s software quality assurance requirements for safety software.  The models in the toolbox include:

  • ALOHA -- is an atmospheric dispersion model in the EPA- and NOAA-developed CAMEO suite.  It is used to assess the impacts from the atmospheric release of hazardous chemicals.  
  • CFAST – is the Consolidated Model of Fire and Smoke Transport.  It is designed to simulate the impact of past or potential fires and smoke in a specific building environment.
  • EPICODE -- provides emergency response personnel, emergency planners, and health and safety professionals with a software tool to aid them in evaluating the atmospheric release of toxic substances.
  • GENII -- is used to calculate radiation dose and risk from radionuclides released to the environment.
  • IMBA -- is a suite of software modules for internal dosimetry
  • MACCS2 -- the straight-line Gaussian plume model that evaluates doses and health risks from the accidental atmospheric releases of radionuclides.
  • MELCOR  -- models the progression of severe accidents in light-water reactor nuclear power plants

An additional code, Hotspot, is in the process of implementing recommendations for inclusion into the Central Registry.   Hotspot is designed to provide emergency response personnel and emergency planners with a fast, field-portable set of software tools for evaluating incidents involving radioactive material.


CALPUFF is an advanced non-steady-state meteorological and air quality modeling system.  The model has been adopted by the EPA in its Guideline on Air Quality Models for applications involving long range transport of pollutants and their impacts.


CAMEO is a system of EPA- and NOAA-developed software applications used widely to plan for and respond to chemical emergencies.   ALOHA is a component of the CAMEO system.


The Computer-Assisted Protective Action Recommendation System (CAPARS) provides a variety of plume, weather, hazard, and related products with the accuracy and speed needed for response to hazardous materials emergencies.


The HYbrid Single-Particle Lagrangian Integrated Trajectory model is a complete system for computing simple air parcel trajectories to complex dispersion and deposition simulations.   It is provided by the NOAA’s Air Resources Laboratory.

Emergency Preparedness and Response

Centers for Disease Control and Prevention Emergency Preparedness and Response

This CDC website provides links to information related to a wide variety of health emergencies including those dealing with bioterrorism, chemical, and radiological emergencies.  

U.S. Department of Homeland Security (DHS)

The DHS provides a number of websites to support emergency preparedness activities.  This includes  and the Federal Emergency Management Agency (FEMA) homepage. 

NOAA Public Exposure Guidelines

This National Oceanic and Atmospheric Administration (NOAA) Office of Response and Restoration website provides guidelines to assess the severity of the release of a hazardous chemical.

Biological Information

American Biological Safety Association

The Association promotes biosafety as a scientific discipline and serves the growing needs of biosafety professionals throughout the world.  It’s goals are to (1) provide a professional association that represents the interests and needs of practitioners of biological safety and (2) provide a forum for the continued and timely exchange of biosafety information.

Canadian MSDS Information for Biological Agents

Provides MSDS for personnel working in the life sciences as a quick safety reference for infectious microorganisms.

Institute for BioSecurity | St. Louis University

The mission of the Institute for Biosecurity at St. Louis University is to provide public health and emergency response professionals with the education needed for preparedness, response, recovery, and mitigation of emerging biosafety-related public health threats.  The Institute also conducts research that will contribute to the development of national policies to address these threats.


American Industrial Hygiene Association (AIHA)

The AIHA promotes, protects, and enhances industrial hygienists and other occupational health, safety and environmental professionals in their efforts to improve the health and well-being of workers, the community, and the environment.

Biological Effects of Low Level Exposures (BELLE) Advisory Committee

The BELLE Committee assesses the biological effect of low level exposures to chemical agents and radioactivity.  

Office of Hazards Materials Safety (OHMS)

The OHMS is the Federal safety authority tasked with ensuring the safe transport of hazardous materials by air, rail, highway, and water.  It is part of the U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration.