Jump to main content or area navigation.

Contact Us

Air and Climate Change Research

Indoor Air Quality Modeling

IAQ models are used for analyzing the impact of sources, sinks, ventilation, and air cleaners on indoor air quality. Early versions of the model allowed calculation of indoor concentrations as a function of time. The model predictions have been compared with results of test house experiments and the agreement between model predictions and experiment has been very good.

IAQX v1.1: IAQX stands for Simulation Tool Kit for Indoor Air Quality and Inhalation Exposure. It is a Microsoft Windows-based indoor air quality (IAQ) simulation software package that complements and supplements existing IAQ simulation programs (such as RISK) and is designed mainly for advanced users. The IAQX package consists of five stand-alone simulation programs.
In addition to performing conventional IAQ simulations, which compute the time/concentration profile and inhalation exposure, IAQX can estimate the adequate ventilation rate when certain air quality criteria are provided by the user, a unique feature useful for product stewardship and risk management. IAQX will be developed in a cumulative manner and more special-purpose simulation programs will be added to the package in the future.

Installation file for IAQX 1.1 (ZIP) (6.2 MB). The current version of IAQX is compatible with Windows XP, 7, and 8.

After IAQX is installed, the programs and documentation (PDF) (86 pp, 1.7 Mb, About PDF) can be accessed from the Windows Start menu by clicking Start/All Programs/IAQX 1.1. An icon for program GPS.EXE ― one of the five programs in IAQX ― will also be created on the desktop window.

PARAMS 1.1: This Microsoft Windows-based computer program implements 30 methods for estimating the parameters in indoor emissions source models, which are an essential component of indoor air quality (IAQ) and exposure models. These methods fall into seven categories:

  1. the properties of indoor air,
  2. the first-order decay rate constants for solvent emissions from indoor coating materials,
  3. gas-phase, liquid-phase, and overall mass transfer coefficients,
  4. molar volume,
  5. molecular diffusivity in air, liquid, and solid materials,
  6. solid-air partition coefficient, and
  7. vapor pressure and volatility for pure organic compounds and petroleum-based solvents and the properties of water.

Potential users include those who develop or use IAQ and exposure models, and those who develop or use quantitative structure-activity relationship (QSAR) models. In addition, many calculations are useful to researchers in areas other than indoor air quality. Users can benefit from this program in two ways: first, it serves as a handy tool by putting commonly used parameter estimation methods in one place; second, it saves users time by taking over tedious calculations.

Program and documentation (Zip) (4.3 MB) To install the program, run PARAMS_Setup.exe. The current version (1.1) is compatible with Windows XP, 7, and 8.

RISK: The latest published version of the RISK computer model is designed to allow calculation of individual exposure to indoor air pollutants from sources. The model runs in the MS-Windows operating environment and is designed to calculate exposure due to individual, as opposed to population, activity patterns and source use. The model also provides the capability to calculate risk due to the calculated exposure. For more information about the IEMB's IAQ modeling activity, click on the Indoor Air Quality Modeling button to the left.

Two Power Point presentations describing the model are available for download.
RISKPresentation1 (ZIP) (322 KB)
RISKPresentation2 (ZIP) (692 KB)

A paper describing use of the model for particulate modeling is available for download here.
PMModel (ZIP) (152 KB)

Documentation for the model is provided here.
RISKDocs (ZIP) (1.2 MB)

The model files are provided here.
RISKV19 (ZIP) (17 MB)

These files are in zip format and require an unzip program.

Air and Climate Change Research | Water Research | Ecosystems Restoration Research | Land Research | Technology: Sustainable Technologies Research, Environmental Technology Verification Program (ETV), and Technology Assessments

Jump to main content.