How Long You Should <br />Wear an N95 Mask, According to <br />Health Experts.<br />As experts recommended, many of us have swapped out our flimsy cloth masks for a more effective N95 facemask.<br />But how long can you <br />wear an N95 mask before <br />it loses its effectiveness?.<br />I wear mine <br />for a week. , Linsey Marr, professor of civil and environmental engineering <br />at Virginia Tech, via CNN.<br />Experts say an N95 shouldn't "degrade unless you physically rub it or poke holes in it.".<br />You'd have to be in<br />really polluted air <br />... for several days <br />before it lost its ability <br />to filter out particles. , Linsey Marr, professor of civil <br />and environmental engineering <br />at Virginia Tech, via CNN.<br />N95s are considered medical masks. <br />They are said to be single-use, but experts say their ability to filter particles is maintained long after.<br />People have been talking about 40 hours -- I think that's fine. , Linsey Marr, professor of civil <br />and environmental engineering <br />at Virginia Tech, via CNN.<br />Medical experts say an N95 often becomes ineffective due to a loose fit or broken straps, not from a lack of filtration ability.<br />It's going to get gross from <br />your face or the straps will get <br />too loose or maybe break <br />before you're going to lose <br />filtration ability. , Linsey Marr, professor of civil <br />and environmental engineering <br />at Virginia Tech, via CNN.<br />As for general quality and effectiveness, <br />the N95 doesn't have much competition.<br />As for general quality and effectiveness, <br />the N95 doesn't have much competition.<br />According to CNN, the cousin of the N95, <br />the KN95, can be just as effective, but in the United States, many of them are fake.<br />Data from the U.S. Centers for <br />Disease Control and Prevention <br />shows that nearly 60% of KN95 <br />respirators in the United States <br />have been found to be <br />counterfeit and ineffective