3 plyiav pob ntseg lub voj tsis woven cov me nyuam pov tseg lub ntsej muag npog ntsej muag

Cov lus piav qhia luv luv:

1. Los tiv thaiv cov qaub ncaug, anti-hmoov av, PM2.5.
2. Cov txiaj ntsig zoo thiab cov nyhuv tiv thaiv zoo.
3. Lub ntsej muag ntsej muag rau cov menyuam yaus