After a long analysis on pollution masks it has been noted that their effectiveness is reduced by the fact that they can’t fit perfectly on all the face types. The nasal filters instead, give a better result but they are less chosen by people for their aesthetic and lack of comfort. Trâho has the aim of solving these problems, taking advantage of the scanning and the 3D printing technology is possible to have a nasal filter that fits perfectly to anyone. For the form, instead of trying to hide its presence as do the other filters, it has deliberately chosen a provocative and futuristic shape to make people aware on the pollution issue. In fact the white material of which it is composed catching the smog and turns black, giving a shocking evidence of how much the air is polluted.