Which organization primarily focuses on workplace safety regulations in the United States?

The Occupational Safety and Health Administration (OSHA) is the primary organization that focuses on workplace safety regulations in the United States. Established under the Occupational Safety and Health Act of 1970, OSHA's mission is to ensure safe and healthful working conditions by setting and enforcing standards, as well as providing training, outreach, education, and assistance. OSHA has the authority to inspect workplaces, enforce compliance with safety regulations, and impose penalties for violations, highlighting its critical role in protecting workers' health and safety.

The other organizations play significant roles in related areas but do not primarily focus on workplace safety regulations. The National Institute for Occupational Safety and Health (NIOSH) is involved in research and recommendations but does not enforce regulations. The Environmental Protection Agency (EPA) primarily addresses environmental issues rather than workplace safety directly. The Department of Labor (DOL) oversees a broader range of labor-related issues but includes OSHA as one of its agencies focused specifically on workplace safety.