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?)
Pab neeg txuag tib neeg kev ncaj ncees thov kom lub Leej Haum Kuj pab txuag cov neeg thoj nam nyob Thaib teb.
