Ultra-fine dust is not only a factor causing climate instability but also has a significant impact on human psychology and health. In the current state of environmental pollution at an alarming level, it is very necessary to learn about methods to protect health from the effects of fine dust in particular and polluted air.

Currently, Hanoi and Ho Chi Minh City are the two most polluted cities in the world. Air pollution is increasing, fine dust is at a high level, and is getting worse. To protect their health, the simplest way that people who often travel on the street choose is to wear a mask. Masks against fine dust caused by air pollution are specialized masks.