| abstract |
【Task】 Provided are a filter excellent in nitrogen oxide and / or sulfur oxide removal function, and a mask using the filter. [Solution] The filter has the following chemical formula (I) [Chemical 1] (In the formula (I), M is a metal selected from Fe, Co, Mn, Ti, V, Ni, Cu, Zn, Mo, W, and Os) or a natural fiber carrying a derivative thereof The nitrogen oxide or / and sulfur oxide-removed fiber layer containing synthetic fiber, semi-synthetic fiber or regenerated fiber is defined as a gas passage layer. [Selection figure] None |