Ntuj Hloov Tej huab cua tsis zoo nyob saum nruab ntug yog dab tsi ? Thiab ua mob rau peb lub cev tau li cas? Tej huab cua tsis zoo nyob saum nruab ntug yog dab tsi ? Thiab ua mob rau peb lub cev tau li cas ? (What is air pollution and how does it lead to disease in our bodies?)
Vaj Qhia Fas Ntshis Kus tus mob nyob li qhov qub, kev siv tshuab tsom hais meej tias ob peb hnub dhau los no Vaj Qhia tus mob zoo zog lawm.
