Dust filtering half mask conceived both to protect the users against viruses and bacteria during all day and to protect workers that need a respiratory protective equipment against potentially dangerous particles at work. The protection of half mask is also enhanced by comfort provided by its vertical folding shape and its ear elastic bands welded by ultrasounds, granting a wide field of view as well. The half mask is packed in comfortable and sanitary small bags containing 5 pieces that include an adiustment hook suitable to attach the ear elastic bands behind the neck, allowing an optimal fitting to the smaller faces, too. The metal invisible nosepiece is put among mask layers. In this way, the mask has no exposed metals. The structure and materials used are durable and avoid the collapse in humid environments.