Cov poj niam uas siv cov khoom zas plaub hau tas mus li los pleev xim rau lawv cov plaub hau hauv tsev tsis muaj kev pheej hmoo ntau dua ntawm kev mob qog noj ntshav lossis mob qog noj ntshav ntau dua.Thaum qhov no yuav tsum muab kev lees paub dav dav rau cov neeg siv cov plaub hau dyes mus tas li, cov kws tshawb fawb hais tias lawv tau pom tias muaj kev pheej hmoo ntawm qog nqaij hlav zes qe menyuam thiab qee cov qog nqaij hlav ntawm lub mis thiab tawv nqaij.Cov xim plaub hau ntuj kuj pom tias muaj feem cuam tshuam rau qee qhov mob qog noj ntshav.

Kev siv cov plaub hau zas plaub hau yog nrov heev, tshwj xeeb tshaj yog cov hnub nyoog laus uas xav kom npog cov cim ntawm grey.Piv txwv li, nws tau kwv yees tias nws yog siv los ntawm 50-80% ntawm cov poj niam thiab 10% ntawm cov txiv neej hnub nyoog 40 thiab laus dua hauv Tebchaws Meskas thiab Europe.Cov plaub hau nruj tshaj plaws yog cov hom kev mus tas li thiab cov nyiaj no rau kwv yees li 80% ntawm cov plaub hau dyes siv nyob rau hauv Teb Chaws Asmeskas thiab Europe, thiab ib qho kev faib ua ntau dua hauv Asia.

Txhawm rau kom nkag siab zoo dua ntawm kev pheej hmoo ntawm mob qog noj ntshav los ntawm kev siv cov plaub hau zas tus kheej, cov kws tshawb fawb tau txheeb xyuas cov ntaub ntawv ntawm 117,200 tus poj niam.Cov poj niam tsis muaj mob qog noj ntshav thaum pib ntawm txoj kev tshawb fawb thiab tau ua raws li 36 xyoo.Cov txiaj ntsig tau pom tias tsis muaj kev pheej hmoo ntau dua ntawm cov qog nqaij hlav lossis mob qog noj ntshav hauv cov poj niam uas tau tshaj tawm tias tau siv cov plaub hau mus tas li piv rau cov uas tsis tau siv cov xim zoo li no.