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Hanoi air quality

Vietnam · Live AQI and hourly forecast for the next 5 days · updated Sun 06:00 local time

92

Moderate

US AQI, mostly PM2.5

Acceptable. Unusually sensitive people should ease off long, intense outdoor effort.

Next 24 hours
90–174US AQI, highest around Sun 19:00
Best time outside
Sun 07:00–10:00US AQI about 90
PM2.5 vs WHO guideline
2.1×32 µg/m³ over 24 h, guideline 15
Cigarette equivalent
≈ 1.4 a dayBerkeley Earth rule of thumb
European AQI
Moderatelevel 3 of 6

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The live globe, centred on Hanoi. Switch pollutants, drag through the next 5 days or press play. Full map →

Pollutants in Hanoi right now

PollutantNowNext 24 h vs WHOUS AQI band
Fine particles (PM2.5) 44 µg/m³ 2.1× Sensitive
Coarse particles (PM10) 46 µg/m³ 0.7× Good
Nitrogen dioxide (NO2) 36 µg/m³ 0.8× Good
Ozone (O3) 20 µg/m³ 1.9× Good
Sulphur dioxide (SO2) 28 µg/m³ 0.6× Good
Carbon monoxide (CO) 984 µg/m³ 0.1× Good
Desert dust0 µg/m³
Smoke and haze (aerosol optical depth)0.36
UV index0.1

“Next 24 h vs WHO” compares the forecast with the World Health Organization’s 2021 guideline levels: 24-hour means of 15 µg/m³ for PM2.5, 45 for PM10, 25 for NO2, 40 for SO2 and 4 mg/m³ for CO, and 100 µg/m³ over 8 hours for ozone. Above 1× is above the guideline.

Next 48 hours

Hourly US AQI. Highest 199 around Mon 18:00, lowest 90 around Sun 07:00.

Good 0–50Moderate 51–100Sensitive 101–150Unhealthy 151–200Very unhealthy 201–300Hazardous 301+

5-day air quality forecast for Hanoi

Daily range of the hourly US AQI, from lowest to highest, on a scale of 0 to 250.

DayUS AQIAt worstWorst hourPM2.5 avgUV max
Sun 27 Sept 90–174 Unhealthy 19:00 35 8.4
Mon 28 Sept 90–199 Unhealthy 18:00 30 8.4
Tue 29 Sept 90–211 Very unhealthy 19:00 37 8.6
Wed 30 Sept 102–115 Sensitive 23:00 43 4.3
Thu 1 Oct 118–136 Sensitive 16:00 42 6.0

Common questions about the air in Hanoi

  1. Is the air in Hanoi safe today?

    For most people, yes. Right now the US AQI in Hanoi is 92, which counts as moderate. Acceptable. Unusually sensitive people should ease off long, intense outdoor effort. It is expected to reach 174 (unhealthy) around Sun 19:00.

  2. When is the best time to be outside in Hanoi?

    Sun 07:00–10:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 90. The worst hour is around Sun 19:00, at 174.

  3. What is the main pollutant in Hanoi?

    Fine particles (PM2.5). It drives the index right now, at 44 µg/m³. Tiny particles from combustion, fires and dust that reach deep into the lungs. The main driver of AQI worldwide.

  4. How does Hanoi's air compare with the WHO guideline?

    2.1 times the guideline. Over the next 24 hours PM2.5 averages about 32 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. O3 is also forecast above its guideline level.

  5. How many cigarettes is a day of Hanoi's air?

    About 1.4 cigarettes. Over the next 24 hours PM2.5 averages about 32 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.

  6. Will air quality in Hanoi improve this week?

    Wednesday looks cleanest. Its AQI peaks at 115, against 211 on Tuesday, the worst day in the forecast.

Measured near Hanoi

StationDistancePM2.5 µg/m³Measured
Unnamed sensor Sensor.Community, low-cost sensor 4.8 km 11 Sun 06:48
Unnamed sensor Sensor.Community, low-cost sensor 6.7 km 22 Sun 06:41

Air quality near Hanoi

All 161 cities

About this forecast

Forecast from CAMS global via Open-Meteo: the Copernicus Atmosphere Monitoring Service (CAMS) model at about 40 km resolution (10 km inside Europe), refreshed twice a day. Models smooth out street-level peaks, so busy roads and industrial sites can be worse than shown; ground stations, where there are any nearby, show what monitors actually measure. The US AQI follows the US EPA scale and the European AQI the EEA bands. Readings for 21.03°N, 105.83°E, updated 2026-09-26 23:00 UTC.