Dust masks protect the lungs against harmful particles in the air, ranging from house dust to very harmful substances such as bacteria. There are three grades: FFP1 (for non-toxic particles), FFP2 (for harmful substances such as metal) and FFP3 (for very harmful particles such as mold spores). Abbreviations on masks indicate whether they are reusable, can withstand clogging and whether they are disposable. Additional points of attention are the breathing valve, shelf life, storage instructions and allergy information. It is important to inspect masks regularly and ensure certification. The correct choice and handling of dust masks ensure optimal protection.