20 – 26 Aug 2025 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

75.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 19.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

-6.2 AQI compared with the previous week’s mean of 82.1.

Highest hourly estimate: 211 in Da Nang · 23 Aug, 17:00 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, 20 Aug	102.2Unhealthy for Sensitive Groups	53–210	27.4	192 / 192
Thu, 21 Aug	81.5Moderate	55–131	21.4	192 / 192
Fri, 22 Aug	70.6Moderate	48–115	17.8	192 / 192
Sat, 23 Aug	78.6Moderate	50–211	23.9	192 / 192
Sun, 24 Aug	85.2Moderate	43–164	23.1	192 / 192
Mon, 25 Aug	59.5Moderate	28–156	10.3	192 / 192
Tue, 26 Aug	53.4Moderate	22–159	12	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	103	100	96	95	92	91	89	88	89	89	91	93	97	100	105	113	120	124	126	124	119	113	104	94
Thu	87	86	86	85	85	84	83	82	81	81	80	80	80	80	80	81	83	84	83	80	78	77	76	75
Fri	74	73	72	71	70	70	69	69	69	69	69	68	67	67	69	71	75	78	78	75	70	68	67	66
Sat	67	67	68	69	69	69	70	70	70	70	70	72	77	81	85	88	91	95	96	95	92	90	85	81
Sun	79	81	83	84	85	86	87	87	87	88	88	88	88	87	87	87	87	86	86	86	85	83	82	79
Mon	77	75	72	70	67	65	63	60	58	57	56	55	55	55	55	54	54	55	56	56	55	54	53	52
Tue	50	49	49	49	49	49	49	49	49	50	50	50	50	53	57	60	63	64	64	62	59	56	53	53

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	113.7Unhealthy for Sensitive Groups	164	38.4	168 / 168
Ho Chi Minh City	91.9Moderate	136	29.2	168 / 168
Da Nang	82.6Moderate	211	13.1	168 / 168
Hai Phong	75.2Moderate	151	20.5	168 / 168
Hue	68.6Moderate	178	15.6	168 / 168
Nha Trang	64.8Moderate	118	14.5	168 / 168
Can Tho	62.6Moderate	82	15	168 / 168
Da Lat	47.4Good	63	9.2	168 / 168

City-hours by category

Good: 180

Moderate: 902

Unhealthy for Sensitive Groups: 188

Unhealthy: 64

Very Unhealthy: 10

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	103	100	96	95	92	91	89	88	89	89	91	93	97	100	105	113	120	124	126	124	119	113	104	94
Thu	87	86	86	85	85	84	83	82	81	81	80	80	80	80	80	81	83	84	83	80	78	77	76	75
Fri	74	73	72	71	70	70	69	69	69	69	69	68	67	67	69	71	75	78	78	75	70	68	67	66
Sat	67	67	68	69	69	69	70	70	70	70	70	72	77	81	85	88	91	95	96	95	92	90	85	81
Sun	79	81	83	84	85	86	87	87	87	88	88	88	88	87	87	87	87	86	86	86	85	83	82	79
Mon	77	75	72	70	67	65	63	60	58	57	56	55	55	55	55	54	54	55	56	56	55	54	53	52
Tue	50	49	49	49	49	49	49	49	49	50	50	50	50	53	57	60	63	64	64	62	59	56	53	53

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	103	100	96	95	92	91	89	88	89	89	91	93	97	100	105	113	120	124	126	124	119	113	104	94
Thu	87	86	86	85	85	84	83	82	81	81	80	80	80	80	80	81	83	84	83	80	78	77	76	75
Fri	74	73	72	71	70	70	69	69	69	69	69	68	67	67	69	71	75	78	78	75	70	68	67	66
Sat	67	67	68	69	69	69	70	70	70	70	70	72	77	81	85	88	91	95	96	95	92	90	85	81
Sun	79	81	83	84	85	86	87	87	87	88	88	88	88	87	87	87	87	86	86	86	85	83	82	79
Mon	77	75	72	70	67	65	63	60	58	57	56	55	55	55	55	54	54	55	56	56	55	54	53	52
Tue	50	49	49	49	49	49	49	49	49	50	50	50	50	53	57	60	63	64	64	62	59	56	53	53

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	103	100	96	95	92	91	89	88	89	89	91	93	97	100	105	113	120	124	126	124	119	113	104	94
Thu	87	86	86	85	85	84	83	82	81	81	80	80	80	80	80	81	83	84	83	80	78	77	76	75
Fri	74	73	72	71	70	70	69	69	69	69	69	68	67	67	69	71	75	78	78	75	70	68	67	66
Sat	67	67	68	69	69	69	70	70	70	70	70	72	77	81	85	88	91	95	96	95	92	90	85	81
Sun	79	81	83	84	85	86	87	87	87	88	88	88	88	87	87	87	87	86	86	86	85	83	82	79
Mon	77	75	72	70	67	65	63	60	58	57	56	55	55	55	55	54	54	55	56	56	55	54	53	52
Tue	50	49	49	49	49	49	49	49	49	50	50	50	50	53	57	60	63	64	64	62	59	56	53	53