Two face mask providers say they are closing, as the slow and steady decline of what was once a much-sought-after item continues. Project N95, a nonprofit that helped people buy protective equipment during the coronavirus pandemic, said Monday it would stop selling masks on Dec. 18 and wind down its operations. It said that revenues from mask sales and donations were no longer enough to support its operations. “Over time, we’ve seen reduced demand for masks,” said Anne Miller, the executive dire