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PM2.5 concentration
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Hanoi air quality improves in pandemic year but still a concern
Air quality in the Vietnamese capital Hanoi improved in 2020 but was still the 12th worst among cities in the world.
Hanoi air pollution worst in five years, says government report
The PM2.5 particulate level in Hanoi reached a five-year high last month and environment officials urge residents to limit outdoor activities.
