21 – 27 Jan 2026 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

73.4Weekly mean modelled AQI · Moderate

Mean PM2.5: 21.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

-15.5 AQI compared with the previous week’s mean of 88.9.

Highest hourly estimate: 167 in Hanoi · 27 Jan, 23:00 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, 21 Jan	74Moderate	54–119	20.7	192 / 192
Thu, 22 Jan	69.1Moderate	43–126	17.5	192 / 192
Fri, 23 Jan	66.9Moderate	36–134	19.4	192 / 192
Sat, 24 Jan	74.6Moderate	32–141	21.6	192 / 192
Sun, 25 Jan	77.3Moderate	35–157	22	192 / 192
Mon, 26 Jan	73Moderate	51–153	20	192 / 192
Tue, 27 Jan	79.1Moderate	44–167	26.4	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	74	74	74	73	73	73	73	72	72	72	72	72	72	73	73	73	73	78	81	82	79	75	73	72
Thu	72	72	72	72	71	71	71	70	70	69	69	69	68	68	67	67	67	68	69	70	69	67	66	66
Fri	66	66	65	65	65	65	65	65	65	65	65	65	66	66	66	66	67	69	71	72	72	70	69	69
Sat	69	69	69	70	70	70	70	70	71	71	71	72	72	73	74	74	77	84	88	89	87	82	77	74
Sun	74	75	75	75	75	75	76	76	77	77	77	77	77	77	77	76	78	82	86	86	82	79	76	76
Mon	76	76	76	76	75	75	74	74	73	73	72	72	71	71	71	70	70	73	75	74	73	72	71	72
Tue	72	73	73	74	74	74	75	75	76	77	78	78	78	79	79	79	81	85	89	90	88	86	84	82

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	110.9Unhealthy for Sensitive Groups	167	43.8	168 / 168
Can Tho	85.3Moderate	134	25.1	168 / 168
Ho Chi Minh City	84.4Moderate	139	23.7	168 / 168
Hai Phong	80Moderate	136	26.5	168 / 168
Hue	64.7Moderate	71	16.4	168 / 168
Da Nang	62.1Moderate	72	14.6	168 / 168
Nha Trang	53.7Moderate	59	10.6	168 / 168
Da Lat	46.3Good	56	7.9	168 / 168

City-hours by category

Good: 120

Moderate: 1075

Unhealthy for Sensitive Groups: 103

Unhealthy: 46

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	74	74	74	73	73	73	73	72	72	72	72	72	72	73	73	73	73	78	81	82	79	75	73	72
Thu	72	72	72	72	71	71	71	70	70	69	69	69	68	68	67	67	67	68	69	70	69	67	66	66
Fri	66	66	65	65	65	65	65	65	65	65	65	65	66	66	66	66	67	69	71	72	72	70	69	69
Sat	69	69	69	70	70	70	70	70	71	71	71	72	72	73	74	74	77	84	88	89	87	82	77	74
Sun	74	75	75	75	75	75	76	76	77	77	77	77	77	77	77	76	78	82	86	86	82	79	76	76
Mon	76	76	76	76	75	75	74	74	73	73	72	72	71	71	71	70	70	73	75	74	73	72	71	72
Tue	72	73	73	74	74	74	75	75	76	77	78	78	78	79	79	79	81	85	89	90	88	86	84	82

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	74	74	74	73	73	73	73	72	72	72	72	72	72	73	73	73	73	78	81	82	79	75	73	72
Thu	72	72	72	72	71	71	71	70	70	69	69	69	68	68	67	67	67	68	69	70	69	67	66	66
Fri	66	66	65	65	65	65	65	65	65	65	65	65	66	66	66	66	67	69	71	72	72	70	69	69
Sat	69	69	69	70	70	70	70	70	71	71	71	72	72	73	74	74	77	84	88	89	87	82	77	74
Sun	74	75	75	75	75	75	76	76	77	77	77	77	77	77	77	76	78	82	86	86	82	79	76	76
Mon	76	76	76	76	75	75	74	74	73	73	72	72	71	71	71	70	70	73	75	74	73	72	71	72
Tue	72	73	73	74	74	74	75	75	76	77	78	78	78	79	79	79	81	85	89	90	88	86	84	82

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	74	74	74	73	73	73	73	72	72	72	72	72	72	73	73	73	73	78	81	82	79	75	73	72
Thu	72	72	72	72	71	71	71	70	70	69	69	69	68	68	67	67	67	68	69	70	69	67	66	66
Fri	66	66	65	65	65	65	65	65	65	65	65	65	66	66	66	66	67	69	71	72	72	70	69	69
Sat	69	69	69	70	70	70	70	70	71	71	71	72	72	73	74	74	77	84	88	89	87	82	77	74
Sun	74	75	75	75	75	75	76	76	77	77	77	77	77	77	77	76	78	82	86	86	82	79	76	76
Mon	76	76	76	76	75	75	74	74	73	73	72	72	71	71	71	70	70	73	75	74	73	72	71	72
Tue	72	73	73	74	74	74	75	75	76	77	78	78	78	79	79	79	81	85	89	90	88	86	84	82