The National Institute for Occupational Safety and Health (NIOSH) is pleased to present Controlling Health Hazards When Working with Nanomaterials: Questions to Ask Before You Start. This poster is a visual tool designed to guide those who work with nanomaterials on how to prevent exposures. The poster poses questions that the reader should ask themselves before starting work with a nanomaterial. Readers can then move through the poster to see which different control and personal protective equipment options are appropriate based on the physical form of the nanomaterial. The poster can be displayed in a lab or work environment, making it an easily accessible reminder of the important health and safety considerations for working with nanomaterials.