EN 149 yog European tus qauv ntawm kev sim thiab cim cov cai rau kev lim ib nrab lub qhov ncauj qhov ntswg.Cov qhov ncauj qhov ntswg no npog lub qhov ntswg, qhov ncauj thiab lub puab tsaig thiab tej zaum yuav muaj qhov nqus pa thiab / lossis lub qhov ntswg.EN 149 txhais peb chav kawm ntawm cov khoom siv ib nrab lub qhov ncauj qhov ntswg, hu ua FFP1, FFP2 thiab FFP3, (qhov twg FFP sawv cev rau kev lim lub ntsej muag) raws li lawv cov kev lim dej.Nws kuj tseem faib cov qhov ncauj qhov ntswg rau hauv 'kev siv ib zaug xwb' (tsis rov siv tau, cim NR) lossis ' rov siv tau (ntau dua ib qho kev hloov pauv)' (cim R), thiab ib tsab ntawv cim ntxiv D qhia tias lub npog ntsej muag tau dhau los. xaiv clogging test siv dolomite hmoov av.Xws li cov neeg kho tshuab lim dej tiv thaiv kev nqus ntawm cov khoom xws li hmoov av, cov tee dej, thiab aerosols.
