The document discusses combustible dust, including what it is, who regulates it, and how explosions can be prevented. It defines combustible dust as fine particles that can explode when suspended in air. The Occupational Safety and Health Administration (OSHA) regulates combustible dust along with other organizations like the National Fire Protection Association (NFPA). The document recommends engineering controls, housekeeping, training, and other measures to prevent combustible dust explosions based on OSHA and NFPA guidelines.