March 11, 2020 - EPA evaluated the risks remaining after fully implementing the 2003 National Emission Standards for Hazardous Air Pollutants (NESHAP) for Engine Test Cells/Stands and determined that risks from this source category are acceptable. In addition, the agency identified no developments in practices, processes or control technologies that would further reduce emissions of air toxics. EPA is not making significant changes to the original NESHAP for this source category and has determined the standards continue to provide an ample margin of safety to protect public health and the environment.
EPA is finalizing only minor amendments to the existing regulation. These amendments clarify that the standards are applicable during periods of startup, shutdown and malfunction and require electronic reporting of performance test results.
For more information on the rule, visit the regulation page for Engine Test Cells/StandsYou may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.