Hanoi Air Quality
Vietnam · 21.03, 105.83 · hour of 2026-10-07 23:00 UTC
165US AQI
UnhealthyCategory
90.8PM2.5 (µg/m³)
93.6PM10 (µg/m³)
9O3 (µg/m³)
56.5NO2 (µg/m³)
30.6SO2 (µg/m³)
1,290CO (µg/m³)
What this means
Hanoi currently ranks #7 of 50 tracked cities for PM2.5 (1 = most polluted). Its PM2.5 level of 90.8 µg/m³ is 6.1× the WHO 24-hour guideline of 15 µg/m³. A US AQI of 165 falls in the “Unhealthy” band; see the health guide for what each band means.
Figures are hourly values from the Open-Meteo Air Quality API, modelled from Copernicus CAMS forecasts for the city-centre coordinates rather than read from a single ground station. Concentrations are in micrograms per cubic metre; the US AQI follows EPA breakpoints and reports the worst pollutant. Data is cached for 15 minutes.