Vietnam's air quality improves but has not met WHO standard

Smog in Hanoi's Cau Giay District on November 16, 2021. Photo by VnExpress/Ngoc Thanh

Air quality in Vietnam improved in 2021 but still failed to meet the World Health Organization's annual average PM2.5 concentration guidelines.

The decline in the annual average PM2.5 concentration continued in 2021, falling to 24.7 μg/m3 after peaking in 2019 at 34.1, the World Air Quality Report by Swiss technology and monitoring company IQAir said.

The report, released Tuesday, contains PM2.5 air pollution data from ground-based monitoring stations in 6,475 cities in 117 countries, regions and territories.

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