The 3M Filtering Barrier Face Covering is a barrier face covering that can also help reduce airborne particulate exposure， when used as instructed. It can be used in crowded places， airplanes or everyday moments to help filter airborne particles such as pollen or other allergens. The filter media filters at least 95% of airborne particles such as airborne pollen， pet dander， other allergens， dirt， environmental air pollution particles and other airborne particulate matter. Barrier face coverings may help block large particle droplets expelled by you from reaching others when you speak， cough or sneeze. For use when traveling， running errands， attending personal appointments or doing other activities where face coverings are needed.