Which federal agency sets national standards for environmental programs and approves the efficacy of products used for infection control?

The correct answer is the Environmental Protection Agency (EPA) because it is responsible for setting national standards for environmental protection and regulating products that are designed to mitigate pollution and promote public health. In the context of infection control, the EPA evaluates and approves the efficacy of disinfectants, sanitizers, and other products that help maintain a safe and healthy environment. The EPA's role includes ensuring that products sold to consumers meet rigorous effectiveness and safety standards.

While other agencies play critical roles in health and safety, their focus areas differ. For instance, the Food and Drug Administration (FDA) regulates food, drugs, and medical devices, but does not specifically handle products related to environmental standards. The Centers for Disease Control and Prevention (CDC) focuses on public health and safety guidelines and provides recommendations for infection control but does not have the authority to approve products. The Occupational Safety and Health Administration (OSHA) ensures workplace safety but does not set standards for environmental products. Thus, it is the EPA that aligns with the primary responsibilities outlined in the question.