The National Emission Standards for Hazardous Air Pollutants (NESHAP) is an Environmental Protection Agency (EPA) standard that is applicable within the United States to the emissions of hazardous air pollutants produced by corporations, institutions and at Agencies at all levels of government. The hazardous air pollutants are those pollutants that are known or suspected to cause cancer, serious health effects, or adverse environmental effects.  For the U.S. Department of Energy (DOE) sites, the EPA regulates radionuclide emissions to air, other than radon, under Subpart H of 40 CFR Part 61.  Subpart H requires DOE operations that have the potential to emit radionuclides to ambient air to issue an annual compliance report demonstrating site compliance with the dose standard.

EPA CAP-88 (Clean Air Act Assessment Package - 1988) Modeling software:  CAP-88 is used a regulatory compliance tool under NESHAPS.