Sterilization, huab cua ntshiab, tshem tawm formaldehyde, saib xyuas lub sijhawm, ntau lub sijhawm ceev, lim PM2.5
1.formaldehyde pom
2.smog pom
3. plua plav lim
4.toluene lim
5.second-tes pa luam yeeb pom
6. Cov kab mob pom
7. ntxhiab lim
8.tvoc lim