Scope of Work

Assessment of health hazards in the workplace, inhalation exposure modeling, dermal exposure modeling, product exposure assessment, and modeling.

Goals and Objectives

EASC is focused on providing the practicing professional with the tools necessary to demonstrate the value of industrial/occupational hygiene to workers and to the organization they work for through the use of professional knowledge, judgment, and tools that result in high-quality exposure assessments while reducing the time and resources required to reach a decision regarding the exposures.

Membership Diversity

The committee is composed of a diverse group of professionals from industry, government, and academia with a wide range of academic qualifications and experiences. There are many ways to participate in the EASC, e.g., work on a project team, teach a PDC, organize a roundtable or work on the production of a white paper or textbook.

Advocacy and Influence

The EASC reviews and provides comments (through the AIHA) on pending regulatory and current issues in occupational health and safety.


The EASC provides tools and training to improve the understanding and application of:
• Mathematical Modeling of Chemical Inhalation Exposures
• Deterministic Exposure Data Analysis Techniques
• Probabilistic Exposure Data Analysis Techniques
• Bayesian Decision Analysis for Exposure Acceptability
• Downstream Product Exposure Assessment
• Dermal Exposure Assessment
• Sampling Strategy Development
• Approaches to Improved Professional Judgment

Operational Excellence

The EASC Committee is a recognized model for operational excellence within the AIHA. The Committee is composed of dedicated and energized professionals and is a recognized source of exposure science information for the occupational environment. The Committee is committed to outreach and development of future practicing industrial hygiene professionals, expanding AIHA membership, and educating the general public on the practice of industrial hygiene.

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.

Current Projects

1. Development of an entry-level case study-based modeling book
2. Taking up the 5th edition revision of the Exposure Assessment Strategies Book.
3. Bringing new instructors into our highly rated PDCs.
4. Working on an Exposure Assessment chapter for a book on IH Metrics.
5. Beta testers to create and maintain a national IH/OEHS research-to-practice agenda.
6. Supporting improvements to The Checklist tool.

Project Teams

  • Bayesian User Group.
  • Data Quality Objectives.
  • Dermal Exposure.
  • Mathematical Modeling of Exposures.
  • Product Exposure Assessment.
  • Professional Judgment in Exposure Assessment.
  • 5 Year-Strategic Planning.

Products Produced by the Group

A number of publications, PDCs, and IH tools such as IH MOD 2.0, The Checklist, IHStat, and ODHMOD.

Collaboration Efforts

We collaborate with exposure control banding, and other groups as requested.

Group dynamics

Our members range from students to mid-career professionals, with a strong mix of industry, academia, government/military, and consulting. You can choose the level of involvement that fits your availability and earn CM points by:

  • Joining a project team and learn from each other while producing real-world solutions and tools to protect the health and safety of workers around the world.
  • Participate in quarterly committee meetings—provide feedback, recommend areas to explore, communicate opportunities to collaborate.
  • One and done micro-volunteering tasks as the needs arise.
  • #IAMIH Challenge—public awareness and attracting the next generation of IH/OEHS professionals.
  • Mentorship and professional development.
  • Leadership development (serving as an officer of the group, project team leader).


(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.

  • Basic Exposure Assessment and Sampling Spreadsheet
  • Functional Requirements for IH Systems​ provides basic and advanced requirements one may need in a computer database system to be able to make informed exposure judgments. 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 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. A IHMOD_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 unit 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 is 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 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
  • IH Exposure Scenario Tool (IHEST) guides the assessor through the process of collecting general information about the workplace, specific scenarios, 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).
  • The 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 workplace 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.

Legal Disclaimer: These tools were developed by volunteers over the years, and are not copyrighted by them to our knowledge. While AIHA's logo appears on at least some of them, the Association does not control ownership rights. As directed by legal counsel, AIHA cannot enter into any agreements with third parties for the production of derivative works (e.g., translations into other languages) unless the original authors assign rights under separate agreements.