The Air Pollution Index is a measure of daily air quality. Hanoi's air pollution index has been alarmingly high in recent days, which can cause many negative consequences to human health.

Statistics from the Vietnam Environmental Monitoring Center show that the concentration of fine dust pm2.5 and fine dust pm1.0 in the air in Hanoi and Ho Chi Minh City is at an alarming level, exceeding the standards of the World Health Organization (WHO) and potentially directly affecting human health.

Ultra-fine dust or PM 1.0 dust is liquid or solid particles floating in the air. Ultra-fine dust or PM 1.0 dust causes DNA mutations and many obvious problems that seriously affect human health.