What organization approves pesticide respirators for use?

The National Institute for Occupational Safety and Health (NIOSH) and the Mine Safety and Health Administration (MSHA) are responsible for the approval of respiratory protective devices for various applications, including pesticide use. NIOSH assesses and certifies respirators to ensure they meet specific performance standards for occupational safety. These standards are critical in situations where workers may be exposed to hazardous substances, such as pesticides, to ensure their safety and health.

While other organizations, such as the Environmental Protection Agency (EPA), focus on the regulation and safety of pesticides themselves, and the Occupational Safety and Health Administration (OSHA) oversees workplace safety standards, it is NIOSH that specifically tests and certifies respirators. The Food and Drug Administration (FDA) primarily deals with the regulation of food and drugs, and does not focus on the approval of respirators. Therefore, the involvement of NIOSH and MSHA in the respirator approval process makes this option the correct answer in the context of pesticide use.