Cov khoom ua si yas zoo li cas hauv cov khoom ua si yas?
DOP siv ntau cov khoom ua si ntawm cov menyuam yaus thiab DINP kuj muaj. DOP tau txwv nyob rau hauv European Union, tab sis DOP yog siv los ua tus yas yas rau hauv li ntawm 80% ntawm cov khoom yas domestic.