Which of the following is regulated by OSHA?

• A. Noise levels
• B. Ventilation standards
• C. Humidity levels
• D. Formaldehyde levels

Answer: (D)

OSHA focuses on limiting workers’ exposure to hazardous substances, and formaldehyde is a well-established chemical hazard used in embalming that can irritate tissues and is linked to cancer with long-term exposure. Because of this, OSHA has explicit exposure limits and requires monitoring, engineering controls (like effective ventilation), proper handling procedures, training, and medical surveillance where needed. This direct, enforceable regulation of a specific hazardous substance makes formaldehyde levels in the workplace the one most clearly regulated by OSHA. While ventilation standards and noise regulations exist, and humidity control is important for comfort and safety, the formaldehyde exposure limits are the most directly defined and enforceable in this context.