N95respiratorisoneofnineNIOSHcertifiedparticlerespirators."N"meansnotresistanttooil."95"meansthattheparticleconcentrationinthemaskismorethan95%lowerthanthatoutsidethemaskwhenexposedtoaspecifiednumberofspecialtestparticles.95%isnottheaverage,buttheminimum.N95isnotaspecificproductname.AslongastheproductmeetsN95standardandpassesNIOSHreview,itcanbecalled"N95mask".ThedegreeofprotectionisN95,whichmeansthatunderthetestconditionsspecifiedinNIOSHstandard,thefilteringefficiencyofthefiltermaterialofthemaskfornonoilyparticles(suchasdust,acidmist,paintmist,microorganism,etc.)reaches95%.ThefiltrationefficiencyofN95respiratorforparticleswithaerodynamicdiameterof0.075μm±0.02μmisover95%.Theaerodynamicdiameterofairbacteriaandfungalsporesmainlyvariedbetween0.7-10μm,whichwasalsowithintheprotectionrangeofN95respirator.Therefore,N95respiratorcanbeusedforrespiratoryprotectionofsomeparticles,suchasdustgeneratedintheprocessofgrinding,cleaningandhandlingminerals,flourandsomeothermaterials.Itcanalsobeusedforliquidornonoilparticlesthatdonotproduceharmfulvolatilegasesduetospraying.Itcaneffectivelyfilterandpurifytheabnormalsmellinhaled(excepttoxicgas),helpreducetheexposurelevelofsomeinhalablemicrobialparticles(suchasmold,anthrax,tuberculosis,etc.),butitdoesnoteliminatetheriskofcontactinfection,diseaseordeath.TheU.S.DepartmentoflaborhasrecommendedN95masksformedicalstafftopreventmicrobialairbornediseasessuchasinfluenzaandtuberculosis.Washyourhandsbeforewearingthemask,oravoidtouchingtheinnersideofthemaskduringwearing,soastoreducethepossibilityofcontaminationofthemask.Distinguishtheinsideandoutside,upanddownofthemask.Donotuseyourhandstosqueezethemask.N95maskcanonlyisolatethevirusonthesurfaceofthemask.Ifyouuseyourhandstosqueezethemask,theviruswillsoakthroughthemaskwiththedroplets,whichiseasytocausevirusinfection.Trytomakethemaskandfacehaveagoodfit.Thesimpletestmethodis:afterwearingthemask,exhalehard,andtheaircan'tleakfromtheedgeofthemask.Theprotectivemaskmustbeclosetotheuser'sface,andtheusermustshaveoffhisbeardtoensurethatthemaskcanclosetotheface.Thebeardandanythingbetweenthemaskgasketandthefacewillcausethemasktoleak.Afteradjustingthepositionofthemaskaccordingtothefaceshape,pressthenoseclipwiththeindexfingerofbothhandsalongtheupperedgeofthemasktomakeitclosetotheface[4]anchorpoint.Incaseofthefollowingconditions,themaskshallbereplacedintime:Whenrespiratoryimpedanceincreasedsignificantly;Whenthemaskisdamagedordamaged;Whenthemaskandthefacecannotfittightly;Themaskiscontaminated(suchasbloodstainsordroplets,etc.);Themaskhasbeencontaminated(usedinindividualwardorpatientcontact);Ifthemaskcontainsactivatedcarbon,thereispeculiarsmellinthemask;Usethemasklongerthanrecommended.

ThefiltrationefficiencyofN95respiratorforparticleswithaerodynamicdiameterof0.075μm±0.02μmisover95%.Theaerodynamicdiameterofairbacteriaandfungalsporesmainlyvariedbetween0.7-10μm,whichwasalsowithintheprotectionrangeofN95respirator.Therefore,N95respiratorcanbeusedforrespiratoryprotectionofsomeparticles,suchasdustgeneratedintheprocessofgrinding,cleaningandhandlingminerals,flourandsomeothermaterials.Itcanalsobeusedforliquidornonoilparticlesthatdonotproduceharmfulvolatilegasesduetospraying.Itcaneffectivelyfilterandpurifytheabnormalsmellinhaled(excepttoxicgas),helpreducetheexposurelevelofsomeinhalablemicrobialparticles(suchasmold,anthrax,tuberculosis,etc.),butitdoesnoteliminatetheriskofcontactinfection,diseaseordeath