Scientists from Georgetown University have presented a method for obtaining filtering porous material from copper nanowires. In terms of filtration efficiency, it can be compared with classical respirators. According to TASS, in terms of breathing comfort, this material is comparable to masks of the N95 class, which are usually made of polypropylene. Since it is made of copper, it can be cleaned of viral particles and other contaminants in a variety of ways. Moreover, the material itself has powerful bactericidal properties. Structures like this are made from nanowires made of copper, palladium, and other metals. Experiments have shown that these materials are well suited for creating catalysts and systems for air purification from vapors of harmful substances. And the COVID-19 pandemic forced developers to adapt materials to filter viral particles. The material capable of trapping virus particles was obtained from copper. It withstood mechanical stress well, retaining more than 97% of particles in the size of 0.1-0.4 micrometers, performing even better than masks and respirators of the N95 class. Also, importantly, the final product with a reusable copper filter layer will have a low cost - the cost of a mask based on this material should not exceed $ 2.