As a public health precaution, N95 masks are essential for cancer patients and school nurses. The National Institute for Occupational Safety and Hazard Prevention and Control has not been able to certify these devices, but the National Institute for Occupational Safety and Health does regulate the sale of certified N95 masks. In addition to being certified by the government, an N95 mask is approved by the CDC to withstand the virus. Its certification ensures that it meets the highest standards for safety and quality.