Which kind of dust-proof mask for coal mines is good and how should we choose it?

       Theworkingenvironmentofcoalminersisatypicalhigh-dustenvironment.Whenworkinginsuchaplaceforalongtime,itisnecessarytobeequippedwithadust-proofmask.Otherwise,ifthiscontinuesforalongtime,itwillinevitablyleadtoseverepneumoconiosis.Whatkindofdust-proofmaskforcoalminesisthebest?
    Firstofall,weneedtounderstandwhatcoalworker'spneumoconiosisis.Coalminedustbelongstoveryfineparticulatematter.Ifpeopleinhaletheparticulatematterforalongtimewithoutprotection,itwillleadtopneumoconiosis.Sinceinthelaterstageofpneumoconiosis,patientsneedtokneeltorelievethepain,pneumoconiosisisalsoknownasthe"diseaseofdyingonone'sknees".
    Whichkindofdust-proofmaskforcoalminesisgood?
    Agooddust-proofmaskforcoalminesmustbetestedbyanationalauthoritativeinstitutionandpossessthecertificationqualificationsinlinewithrelevantnationalstandards.Presumably,everyoneknowsthis.
    ThenationalstandardisthesameastheAmericanstandard.Dust-proofmasksaredividedintothreeprotectionlevelsaccordingtotheprotectionlevel:KN90,KN95andKN100."KN"meansprotectionagainstnon-oilyparticulatematter.Thedust-proofmaskforcoalminesmustchoosetheKNstandard.Theprotectiveeffectofadust-proofmaskdependsontwoaspects.Oneisthefiltrationefficiencyofthefiltercotton.Theotheristhetightnessofthecombinationbetweenthemaskandtheface.
    Theselectionmethodandstandardofdust-proofmasksforcoalmines:
    1.Itisrecommendedtochooseamaskwithsmoothbreathing.Somemasksadoptadouble-filtercottondesign,andthefiltercottonhastwosides.Suchmasksarerelativelysmoothforbreathing.
    2.Choosethedust-prooffiltercottonoftheKN100levelforuse.Alowprotectionratewillcauseharmtothebody.
    3.Themasksmadeofsilicagelmaterialaremorecomfortable.Theyaresuitableforlong-termwearingandarenotlikelytocauseallergicreactions.Maskswithhighhardnessarelikelytocauseindentationsontheface.
    4.Masksaredividedintodifferentsizes,whichisextremelyimportant.Donotbuythoseso-calleduniversal-sizedmasks,astheyarepronetoairleakage.
    5.Therearetwotypesofmasks:thosethatcoverthemouthandnose,andthosethatcoverthemouth,noseandmandible.Itisrecommendedtousethelatter,whichisrelativelymorecomfortable.