28 Jan – 3 Feb 2026 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

Modelled US AQI · 8 cities · CAMS via Open-Meteo

75.2Weekly mean modelled AQI · Moderate

Mean PM2.5: 22 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+1.8 AQI compared with the previous week’s mean of 73.4.

Highest hourly estimate: 174 in Hanoi · 3 Feb, 22:00 GMT+7.

1344 of 1344 city-hours have a modelled AQI. These are estimates for roughly 45 km model grid cells, not monitoring-station measurements. How this report is made

Daily modelled US AQI

Day	Mean AQI	Low–high	Mean PM2.5 (µg/m³)	City-hours
Wed, 28 Jan	79.3Moderate	34–169	23.1	192 / 192
Thu, 29 Jan	76.9Moderate	30–156	21.6	192 / 192
Fri, 30 Jan	72.1Moderate	43–138	17.7	192 / 192
Sat, 31 Jan	71.1Moderate	54–132	19	192 / 192
Sun, 1 Feb	67.9Moderate	35–109	18.8	192 / 192
Mon, 2 Feb	74Moderate	32–152	23.9	192 / 192
Tue, 3 Feb	85.5Moderate	35–174	30.3	192 / 192

Hourly means (UTC+7)

Each cell averages the selected cities’ modelled AQI for that hour.

Day	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Wed	82	82	82	82	82	81	81	80	79	78	78	77	77	77	77	78	78	79	81	81	80	78	77	76
Thu	76	75	75	74	74	73	73	73	74	75	75	76	76	76	77	77	78	82	85	86	84	81	77	75
Fri	74	74	74	73	73	72	72	71	70	69	68	67	67	66	66	68	71	78	82	82	79	75	71	68
Sat	66	67	67	68	69	69	69	69	69	69	69	69	69	70	70	70	72	77	79	80	79	77	74	70
Sun	69	68	68	67	66	65	65	65	65	64	65	65	65	65	65	65	66	72	76	78	76	73	71	70
Mon	69	68	68	68	69	69	70	70	71	71	71	72	73	73	74	75	76	80	83	84	83	81	79	78
Tue	79	80	80	81	82	83	84	84	85	86	86	86	87	87	87	87	87	88	90	90	90	89	87	88

Cities by modelled US AQI

Sorted by weekly mean. Each city is a single model grid cell near its centre.

City	Mean AQI	Peak AQI	Mean PM2.5 (µg/m³)	Hours
Hanoi	125.8Unhealthy for Sensitive Groups	174	50.7	168 / 168
Hai Phong	97.4Moderate	153	33.3	168 / 168
Ho Chi Minh City	76.4Moderate	132	21.4	168 / 168
Can Tho	74.8Moderate	117	20.5	168 / 168
Hue	68Moderate	84	18.7	168 / 168
Da Nang	65Moderate	127	14.7	168 / 168
Nha Trang	51.1Moderate	59	10	168 / 168
Da Lat	43.5Good	61	7.2	168 / 168

City-hours by category

Good: 179

Moderate: 964

Unhealthy for Sensitive Groups: 121

Unhealthy: 80

Very Unhealthy: 0

Hazardous: 0

US AQI scale
AQI	Category
0–50	Good
51–100	Moderate
101–150	Unhealthy for Sensitive Groups
151–200	Unhealthy
201–300	Very Unhealthy
301+	Hazardous

How this report is made

Open-Meteo provides hourly estimates from the Copernicus Atmosphere Monitoring Service (CAMS) global model at roughly 45 km resolution. We use the grid cell nearest each city’s centre. Nearby places may share a cell, and local pollution can differ.

The AQI is the provider’s modelled US AQI across pollutants, one value per city per hour. Weekly, daily and hourly means average those values across the selected cities. PM2.5 is a concentration in µg/m³. These figures use a different basis from the measured PM2.5-derived AQI in the Malaysia and Singapore reports.

Days and hours use UTC+7. The report includes past model hours only, never forecasts. The previous-week comparison appears only when at least 90% of that week’s city-hours are available.

For official local readings and advice, visit Centre for Environmental Monitoring. Air-quality data: Open-Meteo and CAMS, licensed under CC BY 4.0. Haze Monitor is independent of these providers and local authorities.

Day	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Wed	82	82	82	82	82	81	81	80	79	78	78	77	77	77	77	78	78	79	81	81	80	78	77	76
Thu	76	75	75	74	74	73	73	73	74	75	75	76	76	76	77	77	78	82	85	86	84	81	77	75
Fri	74	74	74	73	73	72	72	71	70	69	68	67	67	66	66	68	71	78	82	82	79	75	71	68
Sat	66	67	67	68	69	69	69	69	69	69	69	69	69	70	70	70	72	77	79	80	79	77	74	70
Sun	69	68	68	67	66	65	65	65	65	64	65	65	65	65	65	65	66	72	76	78	76	73	71	70
Mon	69	68	68	68	69	69	70	70	71	71	71	72	73	73	74	75	76	80	83	84	83	81	79	78
Tue	79	80	80	81	82	83	84	84	85	86	86	86	87	87	87	87	87	88	90	90	90	89	87	88

Day	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Wed	82	82	82	82	82	81	81	80	79	78	78	77	77	77	77	78	78	79	81	81	80	78	77	76
Thu	76	75	75	74	74	73	73	73	74	75	75	76	76	76	77	77	78	82	85	86	84	81	77	75
Fri	74	74	74	73	73	72	72	71	70	69	68	67	67	66	66	68	71	78	82	82	79	75	71	68
Sat	66	67	67	68	69	69	69	69	69	69	69	69	69	70	70	70	72	77	79	80	79	77	74	70
Sun	69	68	68	67	66	65	65	65	65	64	65	65	65	65	65	65	66	72	76	78	76	73	71	70
Mon	69	68	68	68	69	69	70	70	71	71	71	72	73	73	74	75	76	80	83	84	83	81	79	78
Tue	79	80	80	81	82	83	84	84	85	86	86	86	87	87	87	87	87	88	90	90	90	89	87	88

Day	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Wed	82	82	82	82	82	81	81	80	79	78	78	77	77	77	77	78	78	79	81	81	80	78	77	76
Thu	76	75	75	74	74	73	73	73	74	75	75	76	76	76	77	77	78	82	85	86	84	81	77	75
Fri	74	74	74	73	73	72	72	71	70	69	68	67	67	66	66	68	71	78	82	82	79	75	71	68
Sat	66	67	67	68	69	69	69	69	69	69	69	69	69	70	70	70	72	77	79	80	79	77	74	70
Sun	69	68	68	67	66	65	65	65	65	64	65	65	65	65	65	65	66	72	76	78	76	73	71	70
Mon	69	68	68	68	69	69	70	70	71	71	71	72	73	73	74	75	76	80	83	84	83	81	79	78
Tue	79	80	80	81	82	83	84	84	85	86	86	86	87	87	87	87	87	88	90	90	90	89	87	88