Is the air in Hanoi safe today?

No, it is a health alert. Right now the US AQI in Hanoi is 207, which counts as very unhealthy. Health alert. Avoid outdoor activity, keep windows closed and run an air purifier if you have one.

When is the best time to be outside in Hanoi?

Sat 11:00–14:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 119. The worst hour is around Sat 00:00, at 207.

What is the main pollutant in Hanoi?

Fine particles (PM2.5). It drives the index right now, at 132 µg/m³. Tiny particles from combustion, fires and dust that reach deep into the lungs. The main driver of AQI worldwide.

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

5.9 times the guideline. Over the next 24 hours PM2.5 averages about 88 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. PM10, NO2, O3 and SO2 are also forecast above their guideline levels.

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

About 4.0 cigarettes. Over the next 24 hours PM2.5 averages about 88 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.

Will air quality in Hanoi improve this week?

Monday looks cleanest. Its AQI peaks at 154, against 207 on Saturday, the worst day in the forecast.

Hanoi air quality

Vietnam · Live AQI and hourly forecast for the next 5 days · valid Sat 00:00 local time

207

Very unhealthy

US AQI, mostly PM_2.5

Model estimate. Nearby measurements are shown separately.

Health alert. Avoid outdoor activity, keep windows closed and run an air purifier if you have one.

Next 24 hours: 102–207US AQI, highest around Sat 00:00
Best time outside: Sat 11:00–14:00US AQI about 119
PM_2.5 vs WHO guideline: 5.9×88 µg/m³ over 24 h, guideline 15
Cigarette equivalent: ≈ 4.0 a dayBerkeley Earth rule of thumb

Loading the live globe…

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

Pollutants in Hanoi right now

Pollutant	Now	Level	Next 24 h vs WHO
Fine particles PM_2.5	132 µg/m³	Very unhealthy	5.9×
Coarse particles PM₁₀	136 µg/m³	Moderate	2.0×
Nitrogen dioxide NO₂	81 µg/m³	Good	1.9×
Ozone O₃	0.0 µg/m³	Good	1.5×
Sulphur dioxide SO₂	78 µg/m³	Good	1.2×
Carbon monoxide CO	4,515 µg/m³	Good	0.4×
Aerosol optical depth	0.25	Whole atmosphere · dimensionless
Desert dust	1 µg/m³	Modelled surface dust
UV index	0	Low

“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 PM_2.5, 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. Levels follow the US AQI, which is far less strict than the WHO, so air rated Good can still be above a guideline.

Next 48 hours

Hourly US AQI. Highest 207 around Sat 00:00, lowest 74 around Sun 22:00.

50100150200

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.

Day	US AQI	At worst	Worst hour	PM_2.5 avg	UV max
Sat 14 Nov	102–207	Very unhealthy	0:00	88	6 High
Sun 15 Nov	74–173	Unhealthy	0:00	51	4 Moderate
Mon 16 Nov	75–154	Unhealthy	15:00	30	6 High
Tue 17 Nov	89–206	Very unhealthy	15:00	42	6 High

Common questions about the air in Hanoi

Is the air in Hanoi safe today?
No, it is a health alert. Right now the US AQI in Hanoi is 207, which counts as very unhealthy. Health alert. Avoid outdoor activity, keep windows closed and run an air purifier if you have one.
When is the best time to be outside in Hanoi?
Sat 11:00–14:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 119. The worst hour is around Sat 00:00, at 207.
What is the main pollutant in Hanoi?
Fine particles (PM_2.5). It drives the index right now, at 132 µg/m³. Tiny particles from combustion, fires and dust that reach deep into the lungs. The main driver of AQI worldwide.
How does Hanoi's air compare with the WHO guideline?
5.9 times the guideline. Over the next 24 hours PM_2.5 averages about 88 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. PM₁₀, NO₂, O₃ and SO₂ are also forecast above their guideline levels.
How many cigarettes is a day of Hanoi's air?
About 4.0 cigarettes. Over the next 24 hours PM_2.5 averages about 88 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.
Will air quality in Hanoi improve this week?
Monday looks cleanest. Its AQI peaks at 154, against 207 on Saturday, the worst day in the forecast.

Measured near Hanoi

Station and measurements	Distance	US AQI	Level
Số 1 đường Giải Phóng - phường Bạch Mai - ĐHBK OpenAQ, reference monitor PM_2.5: 51 µg/m³ · Sat 00:20 PM₁₀: 74 µg/m³ · Sat 00:20 SO₂: 11 µg/m³ · Sat 00:20	2.6 km	139	Sensitive
Unnamed sensor Sensor.Community, low-cost sensor PM_2.5: 27 µg/m³ · Sat 00:38 PM₁₀: 38 µg/m³ · Sat 00:38	4.8 km	84	Moderate
Công viên Nhân Chính - Khuất Duy Tiến OpenAQ, reference monitor PM_2.5: 23 µg/m³ · Sat 00:20 PM₁₀: 45 µg/m³ · Sat 00:20 NO₂: 73 µg/m³ · Sat 00:20 SO₂: 2.9 µg/m³ · Sat 00:20	4.9 km	76	Moderate

Air quality near Hanoi

US AQI right now. Cleanest nearby: Phnom Penh (53); worst: Guangzhou (109). The tick on each bar is Hanoi, at 207.

Chiang Mai 758 km W 90 Moderate
Guangzhou 800 km E 109 Sensitive
Shenzhen 866 km E 57 Moderate
Hong Kong 873 km E 57 Moderate
Bangkok 987 km SW 76 Moderate
Phnom Penh 1,058 km S 53 Moderate

All 162 cities →

About this forecast

Forecast from CAMS global via Open-Meteo: the Copernicus Atmosphere Monitoring Service (CAMS) model at about 40 km resolution (about 10 km inside Europe). Global runs update every 12 hours and European runs every 24 hours. Models smooth out street-level peaks, so busy roads and industrial sites can be worse than shown. Nearby station measurements are independent observations, not adjustments to the forecast. The point forecast uses Open-Meteo’s CAMS products, including a separate carbon monoxide product; it can differ from the globe’s global grid. The AQI rates each hour on the US EPA scale, the same way the map colors it; official daily figures average over 24 hours (8 for ozone), so they can read lower after a short peak. Readings for 21.03°N, 105.83°E, valid 2026-11-13 17:00 UTC.