I have noticed that your N95 Sanding Mask and R95 Particulate Mask are NIOSH approved disposable respirators. What is NIOSH?
NIOSH stands for National Institute for Occupational Safety and Health and was established by the Occupational Safety and Health Act of 1970. It is an agency established to help assure safe and healthful working conditions for working men and women by providing research, information, education, and training in the field of occupational safety and health. NIOSH provides national leadership to prevent work-related illness, injury, disability, and death by gathering information, conducting scientific research, and translating the knowledge gained into products and services.