Exposure Assessment Strategies Committee

The mission of the Committee is to provide leadership in the field of exposure assessment and strategies for Environmental Health, Safety, and Industrial Hygiene professionals.

The Committee develops and offers exposure assessment tool, exposure assessment training, and scientific roundtables and other forums for presentation of exposure assessment studies. We have many different project teams (shown below) that are actively working on current issues in exposure assessment. Please feel free to contact us with your suggestions or issues on topics for future project teams. If you would like to join one of the project teams we would be happy to have you. Working on a team is a great opportunity to interact with others who have an interest in the same subject matter. Working on a project provides professional development and is a great networking opportunity. You can also request to be a corresponding member, which will add you to the email distribution list (contact AIHA Liaison).

One of the goals of the Committee is to ensure that the information that we provide is useful to the practicing industrial hygiene professional. One example of this is a PDC (professional development course) that provides video and technical information then works with participants to apply these practical tools and strategies through a series of real-life exposure scenario workshops. These workshops utilize videos, basic characterization information, determinants of exposure, and sampling data for inhalation, dermal, and noise exposures. Participants learn to make sound qualitative and quantitative exposure judgments, gain a better understanding of how they can apply new skills within their organization, and get direct feedback from seasoned experts. The PDC ends with discussion summarizing lessons learned and identifying new opportunities for exposure assessment methodologies in the future.   


If you are interested in getting involved, please contact your AIHA Staff Liaison, or a project team leader listed in the Copy of Project Teams Matrix 04-06-2017.pdfspreadsheet (last updated April 2017).

  • Bayesian User Group

  • Data Quality Objectives

  • Dermal Exposure

  • Mathematical Modeling of Exposures

  • Product Exposure Assessment

  • Professional Judgment in Exposure Assessment

  • 5 Year-Strategic Planning 

TOOLS (For the Practicing Industrial Hygienist)  

The following software tools provide the practicing industrial hygienist with quick and easy access to the information necessary to evaluate exposure profiles and determine if the exposures are acceptable, not acceptable or if more data is needed to make the determination of acceptability. The tools are all free and are regularly updated. Several are available in multiple languages.   

  •  Functional Requirements for IH Systems​ provides basic and advanced requirements one may need in a computer database system to be able make informed exposure judgements.   It is important to have a database tool that has the ability to incorporate qualitative and quantitative assessments.

  • IH MOD​ is a mathematical modeling Excel spreadsheet used for estimating occupational exposures. It is a supplement to the book “Mathematical Models for Estimating Occupational Exposure to Chemicals”. Multiple languages are available. Click on this link for IH MOD General Help

  •  IHMOD_2_0.xlsmIHMOD_2_0 includes the same mathematical models as in the still available (above) IH Mod.  IH Mod 2.0 gives the user the choice between running the model in deterministic (point value parameters) or in Monte Carlo Simulation mode, with choices of distributions of parameter values right in MS Excel with no other software needed.  IHMOD_2_0_Support_File.xlsmIHMOD_2_0_Support_File is also available.  It includes useful information about IH Mod 2.0, and a spreadsheet tab to estimate liquid spill pool generation rates via the Hummel-Fehrenbacher equation, a units of measure conversion tool, examples of generation rate estimation, a “Bootstrap” procedure tool, a summary of approaches to estimate ALPHA for the exponentially decreasing emission rate models, and some links to other resources.  Please note that the support file is evolving and will be updated periodically with new information.  Check back here for updates.​​

  • IHSTAT an Excel application that calculates a variety of exposure statistics, performs goodness of fit tests,  and graphs exposure data. Multiple languages are available.  The book, “A Strategy for Assessing and Managing Occupational Exposures” is intended to accompany this.  The links below will show you how to adjust the macros settings in your version of Excel, if needed    

  • IHSkinPerm​ is an Excel application for estimating dermal absorption. Basic knowledge of Excel is all that is needed to operate IH SkinPerm.  IH SkinPerm is a work product of the AIHA Exposure Assessment Strategies Committee (EASC) and the Dermal Project Team (DPT) in collaboration with Wil ten Berg, author of the original SkinPerm model.  Although various parameters and data outputs have been explained or defined in IH SkinPerm through comments tagged on individual fields, users are encouraged to read Chapter 13 of the Mathematical Models for Estimating Occupational Exposure to Chemicals, 2nd edition, AIHA Press, 2009, C. Keil Editor. This is a useful reference for understanding the science and terminology associated with skin permeation. Refer to the IH_SkinPerm_Manual_May_2017.pdf Help Manual for any questions.

  • Industrial Hygiene Data Interpretation App is a game you can download on your  smartphone or tablet PC. This game illustrates the need for industrial hygienists to use statistical tools every time they interpret sampling data. The IH DIG is a fun app to help Exposure Assessors train their unconscious data interpretation algorithms to better match a Bayesian Likelihood analysis. The App is fun but a serious look at exposure assessment decision making.  Download here,  For iPad, For iPhone, For Android

  • IHEST_V15.xlsmIH Exposure Scenario Tool (IHEST) guides the assessor through the process of collecting general information about the workplace, specific scenario and agents(s), providing cues for measuring or estimating the important determinants of exposure such as generation and ventilation rates.  It also prompts the user to specify the type of engineering controls; this information is needed later when making initial judgments by applying the Qualitative Exposure Assessment Checklist (see below).

  • ChecklistV33.xlsmThe Qualitative Exposure Assessment Checklist (The Checklist) requires only four readily available pieces of information:  The Occupational Exposure Limit (OEL); the Vapor Pressure of the pure chemical (VP) when the agent is gas or vapor form; the observed or reported worplace control measures (observed level of control) and the required level of workplace control (required level of control).  It can be applied in just a few minutes using readily available information and has been shown to be significantly more accurate than subjective intuitive judgments. The user is referred to Chapter 6 of "A Strategy for Assessing and Managing Occupational Exposures", 4th Edition AIHA Press.

Industrial Hygiene Data Interpretation App   

Game (IH DIG) that you can download on your smartphone or tablet PC. This game illustrates the need for industrial hygienists to use statistical tools every time they interpret sampling data. The IH DIG is a fun app to help Exposure Assessors train their unconscious data interpretation algorithms  to better match a Bayesian Likelihood analysis. The App is fun but a serious look at exposure assessment decision making.  


The Exposure Assessment Strategies Committee (EASC) each year sponsors some of the most highly rated Professional Development Courses (PDCs) at AIHCE and the AIHA Fall Conference. The Committee also provides members to AIHA local sections and many international occupational hygiene conferences to offer mini-PDCs or speak on current topics of interest to those groups. 

Below are some brief descriptions  of the PDC offerings. They are listed in the order found by members of the EASC to make the most sense in developing fluency in the practice of judging exposure profiles. Contact AIHA staff or EASC officers for more details on course offerings. 


This PDC is designed to provide participants with exposure assessment strategies for the collection and interpretation of occupational exposure monitoring data. It provides the skills and techniques for developing strategies for effectively managing workplace exposure and monitoring data.  The course also includes the main elements of exposure risk assessment and management:  basic characterization, similar exposure groups (SEGs), define/judge exposure profiles, further information gathering, exposure monitoring strategies, record keeping and reporting,  strategies for implementation, statistics review, censored data analysis, and dermal exposure. 


This PDC is designed to provide training is the application of the Bayesian statistical methods and how they are used in decision making using exposure data. Bayesian methods offer exciting opportunities for improving the accuracy, efficiency, and transparency of our exposure judgments. Bayesian techniques can be used to formally combine our professional judgment regarding a particular exposure and its uncertainty along with the statistical analysis of current exposure data. The language and framework of the approach holds promise for expressing the output of exposure assessments in a manner that is much more easily understood and communicated than the output  from more traditional statistical analysis. Best of all, the Bayesian decision analysis approach formalizes traditional exposure assessment processes already used by IHs today. 

This course will provide an overview of the Bayesian framework for decision analysis and explore, through discussion and workshops, opportunities for its application in IH data interpretation and exposure-risk assessment. A software program for performing Bayesian decision analysis calculations will be distributed. Note that the software is designed for Windows-based PCs. It will not run on a Macintosh computer  without an emulator. 


This PDC is designed to improve professional judgment in occupational exposure assessment. Professional judgment is already an integral component of most occupational exposure assessments. What we need to know is how good our professional judgment is and to continuously improve it. This PDC offers solutions to both of these issues. The PDC incorporates Bayesian statistical techniques to make these judgments transparent and quantitative regarding a particular  exposure and its uncertainty along with the statistical analysis of current exposure data. This PDC will focus on several exposure assessment exercises using videos of tasks and basic workplace characterizations.  Participants will be led through  each scenario and make exposure decisions using their own professional judgments, the rules of thumb, and mathematical exposure models. Participants will learn how these rules of thumb  and exposure models improve exposure decision accuracy and efficiency. 


This PDC reviews the basis and application of exposure-modeling techniques to evaluate airborne contaminant concentrations relevant to IH exposure issues. Hygienists can use models to estimate concentrations when monitoring is unavailable, including: 

  Emergency response scenario preplanning

   Historical worker exposure reconstruction/Event exposure reconstruction

 New chemical/process approvals