The Occupational Safety and Health Administration (OSHA) is proposing to amend the Welding and Cutting Standard in construction to eliminate any perceived ambiguity about the definition of "confined space" that applies to welding activities in construction. This revision will make it clearer and easier to understand what the standard requires and will reduce burdens on the regulatory community by including deregulatory language to allow the use of "natural ventilation" when certain conditions and criteria are met.  On May 4, 2015, when OSHA published the final rule for Confined Spaces in Construction, a new subpart was added to provide protections to employees working in confined spaces in construction. This new subpart replaced OSHA's one training requirement for confined space work with a comprehensive standard that includes a permit program designed to protect employees from exposure to many hazards associated with work in confined spaces, including atmospheric and physical hazards. The explanation of the final rule also discusses in detail how the Welding and Cutting Standard in Construction works together with the confined spaces standard regarding the application of their respective requirements. Although the confined spaces standard states that it encompasses welding activities, the welding standard itself does not expressly identify a definition of "confined space."