EPA Launches Guidance on Environmental Models
"EPA has released a guidance document on the development, evaluation and application of environmental models used to inform environmental decision making. This new resource also provides greater transparency of EPA’s use of models and guidance on the use of proprietary tools and software.

EPA develops and uses a wide range of computer models to simulate the fate of various pollutants, estimate pollution’s impact on public health and the environment, and evaluate the cost and benefits of alternative policies. EPA has been a global leader in the development and use of environmental computer models for environmental protection and continues to improve model development and use."