Mold is one of the most widespread hazards that hurricane, flood, and disaster clean-up workers may encounter. This mobile application was developed by the IUOE National Training Fund to serve as a health and safety resource for workers, volunteers, and homeowners who will participate in clean-up activities to help them understand how to identify and control hazards from mold. Although mold is the focus here, there are many other common hazards encountered in clean-up efforts. The guidance in this mobile application is primarily intended for workers, volunteers, and homeowners who engage in small-scale mold clean-up and treatment of flooded or water-damaged homes. A small-scale project is considered to be 10 square feet or less. For projects larger than 10 square feet, the U.S. CDC, U.S. EPA, and U.S. HUD all recommend using a qualified mold assessment and remediation specialist.Topics include:-What is mold and how to identify it-Mold remediation health and safety precautions-Pre-remediation considerations-Mold remediation work practices, procedures, and methods-Clean-up proceduresResearch reported in this publication was supported by the National Institute of Environmental Health Sciences of the National Institutes of Health under Award Number U45ES006182. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.