Is Hanoi more polluted than Beijing?

Aqicn.org, the website which provides real-time figures about the air pollution levels in cities all over the world, showed that the PM2.5 Index (the fine dust particles less than 2.5 micrometers in diameter) in the air in Hanoi in the last two days reached 388 microgram per cubic meter at maximum and 114 microgram per cubic meter at minimum.

Vietnam’s PM2.5 national standard is 50 microgram per cubic meter. Meanwhile, the level recommended by WHO is 25 micrograms.

This means that the dust concentration in the air in Hanoi in the last days was higher than the allowed level by 2-8 times.