3 – 9 Sep 2025 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

83.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 25 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+14 AQI compared with the previous week’s mean of 69.3.

Highest hourly estimate: 215 in Hanoi · 8 Sept, 18:00 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, 3 Sep	77.9Moderate	29–150	21.1	192 / 192
Thu, 4 Sep	75.5Moderate	41–126	20.8	192 / 192
Fri, 5 Sep	79.6Moderate	44–183	20.7	192 / 192
Sat, 6 Sep	79.5Moderate	49–152	22.8	192 / 192
Sun, 7 Sep	82.9Moderate	37–169	28.7	192 / 192
Mon, 8 Sep	93.1Moderate	22–215	34.2	192 / 192
Tue, 9 Sep	94.8Moderate	46–187	26.7	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	71	72	71	71	71	71	71	71	72	72	72	73	76	79	82	86	90	93	93	90	84	81	79	78
Thu	77	75	74	73	73	73	73	73	72	72	71	71	71	72	74	78	81	85	84	82	80	77	76	74
Fri	73	72	72	72	72	72	72	72	72	72	72	72	74	79	84	90	95	98	98	94	91	87	82	77
Sat	75	73	73	74	74	75	75	75	76	77	77	78	81	84	86	88	89	90	88	85	81	80	79	78
Sun	77	78	79	79	80	80	81	81	82	82	82	82	82	82	85	87	89	89	88	87	85	85	84	85
Mon	84	84	84	84	83	83	83	83	82	83	84	85	86	89	94	99	104	110	116	117	113	108	101	96
Tue	92	93	93	93	93	93	92	91	91	91	90	90	89	89	91	96	99	103	106	106	103	98	97	95

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	144.3Unhealthy for Sensitive Groups	215	63.4	168 / 168
Hai Phong	109.4Unhealthy for Sensitive Groups	202	38.5	168 / 168
Ho Chi Minh City	94.8Moderate	120	32.2	168 / 168
Da Nang	83.5Moderate	198	12.7	168 / 168
Nha Trang	67.5Moderate	131	14.2	168 / 168
Hue	65.8Moderate	97	16.7	168 / 168
Can Tho	55.5Moderate	85	13	168 / 168
Da Lat	45.9Good	60	9.2	168 / 168

City-hours by category

Good: 193

Moderate: 822

Unhealthy for Sensitive Groups: 231

Unhealthy: 91

Very Unhealthy: 7

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	71	72	71	71	71	71	71	71	72	72	72	73	76	79	82	86	90	93	93	90	84	81	79	78
Thu	77	75	74	73	73	73	73	73	72	72	71	71	71	72	74	78	81	85	84	82	80	77	76	74
Fri	73	72	72	72	72	72	72	72	72	72	72	72	74	79	84	90	95	98	98	94	91	87	82	77
Sat	75	73	73	74	74	75	75	75	76	77	77	78	81	84	86	88	89	90	88	85	81	80	79	78
Sun	77	78	79	79	80	80	81	81	82	82	82	82	82	82	85	87	89	89	88	87	85	85	84	85
Mon	84	84	84	84	83	83	83	83	82	83	84	85	86	89	94	99	104	110	116	117	113	108	101	96
Tue	92	93	93	93	93	93	92	91	91	91	90	90	89	89	91	96	99	103	106	106	103	98	97	95

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	71	72	71	71	71	71	71	71	72	72	72	73	76	79	82	86	90	93	93	90	84	81	79	78
Thu	77	75	74	73	73	73	73	73	72	72	71	71	71	72	74	78	81	85	84	82	80	77	76	74
Fri	73	72	72	72	72	72	72	72	72	72	72	72	74	79	84	90	95	98	98	94	91	87	82	77
Sat	75	73	73	74	74	75	75	75	76	77	77	78	81	84	86	88	89	90	88	85	81	80	79	78
Sun	77	78	79	79	80	80	81	81	82	82	82	82	82	82	85	87	89	89	88	87	85	85	84	85
Mon	84	84	84	84	83	83	83	83	82	83	84	85	86	89	94	99	104	110	116	117	113	108	101	96
Tue	92	93	93	93	93	93	92	91	91	91	90	90	89	89	91	96	99	103	106	106	103	98	97	95

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	71	72	71	71	71	71	71	71	72	72	72	73	76	79	82	86	90	93	93	90	84	81	79	78
Thu	77	75	74	73	73	73	73	73	72	72	71	71	71	72	74	78	81	85	84	82	80	77	76	74
Fri	73	72	72	72	72	72	72	72	72	72	72	72	74	79	84	90	95	98	98	94	91	87	82	77
Sat	75	73	73	74	74	75	75	75	76	77	77	78	81	84	86	88	89	90	88	85	81	80	79	78
Sun	77	78	79	79	80	80	81	81	82	82	82	82	82	82	85	87	89	89	88	87	85	85	84	85
Mon	84	84	84	84	83	83	83	83	82	83	84	85	86	89	94	99	104	110	116	117	113	108	101	96
Tue	92	93	93	93	93	93	92	91	91	91	90	90	89	89	91	96	99	103	106	106	103	98	97	95