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?)
