What is the purpose of a dust mask when sanding?

The purpose of a dust mask when sanding is primarily to prevent inhalation of harmful dust particles. During the sanding process, especially when working with materials like wood, metal, or various automotive components, fine particulate matter can become airborne. These dust particles can have adverse health effects when inhaled, leading to respiratory issues or other health problems over time. A dust mask acts as a barrier, filtering out these harmful particles, thus allowing the user to work safely while minimizing respiratory risk.

The other choices reference important aspects of safety in different contexts but do not pertain specifically to the function of a dust mask. For instance, protecting the eyes from flying debris is typically addressed by wearing safety goggles, while maintaining a sterile environment is more relevant in painting contexts, not sanding. Additionally, minimizing noise exposure is important in situations with loud equipment but does not relate to the use of a dust mask during sanding activities.