9 – 15 Sep 2026 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

70.1Weekly mean modelled AQI · Moderate

Mean PM2.5: 20.3 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

-15.3 AQI compared with the previous week’s mean of 85.4.

Highest hourly estimate: 180 in Hanoi · 10 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, 9 Sep	81.3Moderate	16–174	25.2	192 / 192
Thu, 10 Sep	70.3Moderate	12–180	16.9	192 / 192
Fri, 11 Sep	64.6Moderate	13–143	16.3	192 / 192
Sat, 12 Sep	60.4Moderate	22–130	13.9	192 / 192
Sun, 13 Sep	57.3Moderate	29–99	15.7	192 / 192
Mon, 14 Sep	70Moderate	35–116	22.7	192 / 192
Tue, 15 Sep	86.9Moderate	35–165	31.1	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	83	83	83	83	82	82	82	82	82	82	81	81	81	81	81	80	80	82	83	81	80	79	79	78
Thu	77	76	75	73	71	70	68	65	64	64	64	64	64	64	65	70	76	80	80	79	76	71	68	65
Fri	62	61	61	61	62	63	63	64	64	64	64	64	65	64	65	66	69	72	73	71	67	65	62	61
Sat	61	61	61	60	60	60	59	59	58	58	58	58	59	60	61	61	63	67	67	65	62	60	57	56
Sun	56	56	55	55	55	54	54	54	53	53	53	53	53	54	55	57	61	64	66	66	65	63	62	61
Mon	61	62	62	63	64	64	65	65	67	68	69	70	70	71	71	72	74	77	79	79	79	77	76	75
Tue	76	76	77	78	79	80	80	81	82	82	83	83	84	85	86	90	96	101	105	103	99	96	94	91

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	105.4Unhealthy for Sensitive Groups	180	34.8	168 / 168
Ho Chi Minh City	96.1Moderate	152	35.1	168 / 168
Hai Phong	86.4Moderate	152	22.8	168 / 168
Can Tho	71.6Moderate	165	25	168 / 168
Hue	59Moderate	101	14.9	168 / 168
Da Nang	57.4Moderate	124	11.4	168 / 168
Nha Trang	49.8Good	110	10.2	168 / 168
Da Lat	35.1Good	75	7.9	168 / 168

City-hours by category

Good: 399

Moderate: 727

Unhealthy for Sensitive Groups: 163

Unhealthy: 55

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	83	83	83	83	82	82	82	82	82	82	81	81	81	81	81	80	80	82	83	81	80	79	79	78
Thu	77	76	75	73	71	70	68	65	64	64	64	64	64	64	65	70	76	80	80	79	76	71	68	65
Fri	62	61	61	61	62	63	63	64	64	64	64	64	65	64	65	66	69	72	73	71	67	65	62	61
Sat	61	61	61	60	60	60	59	59	58	58	58	58	59	60	61	61	63	67	67	65	62	60	57	56
Sun	56	56	55	55	55	54	54	54	53	53	53	53	53	54	55	57	61	64	66	66	65	63	62	61
Mon	61	62	62	63	64	64	65	65	67	68	69	70	70	71	71	72	74	77	79	79	79	77	76	75
Tue	76	76	77	78	79	80	80	81	82	82	83	83	84	85	86	90	96	101	105	103	99	96	94	91

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	83	83	83	83	82	82	82	82	82	82	81	81	81	81	81	80	80	82	83	81	80	79	79	78
Thu	77	76	75	73	71	70	68	65	64	64	64	64	64	64	65	70	76	80	80	79	76	71	68	65
Fri	62	61	61	61	62	63	63	64	64	64	64	64	65	64	65	66	69	72	73	71	67	65	62	61
Sat	61	61	61	60	60	60	59	59	58	58	58	58	59	60	61	61	63	67	67	65	62	60	57	56
Sun	56	56	55	55	55	54	54	54	53	53	53	53	53	54	55	57	61	64	66	66	65	63	62	61
Mon	61	62	62	63	64	64	65	65	67	68	69	70	70	71	71	72	74	77	79	79	79	77	76	75
Tue	76	76	77	78	79	80	80	81	82	82	83	83	84	85	86	90	96	101	105	103	99	96	94	91

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	83	83	83	83	82	82	82	82	82	82	81	81	81	81	81	80	80	82	83	81	80	79	79	78
Thu	77	76	75	73	71	70	68	65	64	64	64	64	64	64	65	70	76	80	80	79	76	71	68	65
Fri	62	61	61	61	62	63	63	64	64	64	64	64	65	64	65	66	69	72	73	71	67	65	62	61
Sat	61	61	61	60	60	60	59	59	58	58	58	58	59	60	61	61	63	67	67	65	62	60	57	56
Sun	56	56	55	55	55	54	54	54	53	53	53	53	53	54	55	57	61	64	66	66	65	63	62	61
Mon	61	62	62	63	64	64	65	65	67	68	69	70	70	71	71	72	74	77	79	79	79	77	76	75
Tue	76	76	77	78	79	80	80	81	82	82	83	83	84	85	86	90	96	101	105	103	99	96	94	91