4 ms·You can buy an air purifier, like IKEA FÖRNUFTIG.by emil-lp 1y agoYou can buy an air purifier, like IKEA FÖRNUFTIG.tptacek 1y agoAir purifier white noise is the best. I don't know what it is about it.toast0 1y agoIt's cause the noise is filteredhollerith 1y agoAgreed (provided it is a sufficiently large air purifier like Austin Air's Healthmate).