24 – 30 Sep 2025 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

54.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 12.6 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

-20.1 AQI compared with the previous week’s mean of 74.4.

Highest hourly estimate: 132 in Hanoi · 24 Sept, 00:00 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, 24 Sep	66.4Moderate	23–132	15	192 / 192
Thu, 25 Sep	57.6Moderate	26–89	14	192 / 192
Fri, 26 Sep	60.2Moderate	18–97	14.9	192 / 192
Sat, 27 Sep	52Moderate	17–92	11.8	192 / 192
Sun, 28 Sep	49.1Good	16–95	10.3	192 / 192
Mon, 29 Sep	42.9Good	18–83	8.6	192 / 192
Tue, 30 Sep	51.7Moderate	18–125	13.7	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	71	70	70	69	69	68	68	67	67	67	66	66	66	65	65	66	66	67	65	63	62	61	60
Thu	60	59	58	58	58	57	57	57	56	56	56	56	55	56	56	56	58	60	61	62	60	59	58	57
Fri	57	57	58	58	58	59	59	59	60	60	60	60	61	61	61	61	62	64	65	64	63	61	60	59
Sat	58	57	56	56	55	54	54	53	52	51	51	51	50	50	50	50	50	50	50	51	50	50	50	49
Sun	49	49	49	49	49	49	50	50	50	50	50	50	50	50	50	50	50	50	50	49	48	47	47	46
Mon	45	44	43	43	43	42	42	42	41	41	41	40	40	40	40	41	43	45	47	47	47	46	45	43
Tue	44	44	44	45	45	46	46	46	47	47	47	48	48	49	52	56	62	65	66	64	61	58	57	56

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	81.5Moderate	132	24.1	168 / 168
Ho Chi Minh City	70.5Moderate	89	19.3	168 / 168
Hai Phong	66.3Moderate	122	16.3	168 / 168
Da Nang	50.7Moderate	125	9.1	168 / 168
Hue	48.4Good	102	9.9	168 / 168
Nha Trang	46.9Good	73	8.7	168 / 168
Can Tho	46Good	65	9.5	168 / 168
Da Lat	24Good	33	4.1	168 / 168

City-hours by category

Good: 542

Moderate: 772

Unhealthy for Sensitive Groups: 30

Unhealthy: 0

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	71	71	70	70	69	69	68	68	67	67	67	66	66	66	65	65	66	66	67	65	63	62	61	60
Thu	60	59	58	58	58	57	57	57	56	56	56	56	55	56	56	56	58	60	61	62	60	59	58	57
Fri	57	57	58	58	58	59	59	59	60	60	60	60	61	61	61	61	62	64	65	64	63	61	60	59
Sat	58	57	56	56	55	54	54	53	52	51	51	51	50	50	50	50	50	50	50	51	50	50	50	49
Sun	49	49	49	49	49	49	50	50	50	50	50	50	50	50	50	50	50	50	50	49	48	47	47	46
Mon	45	44	43	43	43	42	42	42	41	41	41	40	40	40	40	41	43	45	47	47	47	46	45	43
Tue	44	44	44	45	45	46	46	46	47	47	47	48	48	49	52	56	62	65	66	64	61	58	57	56

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	71	70	70	69	69	68	68	67	67	67	66	66	66	65	65	66	66	67	65	63	62	61	60
Thu	60	59	58	58	58	57	57	57	56	56	56	56	55	56	56	56	58	60	61	62	60	59	58	57
Fri	57	57	58	58	58	59	59	59	60	60	60	60	61	61	61	61	62	64	65	64	63	61	60	59
Sat	58	57	56	56	55	54	54	53	52	51	51	51	50	50	50	50	50	50	50	51	50	50	50	49
Sun	49	49	49	49	49	49	50	50	50	50	50	50	50	50	50	50	50	50	50	49	48	47	47	46
Mon	45	44	43	43	43	42	42	42	41	41	41	40	40	40	40	41	43	45	47	47	47	46	45	43
Tue	44	44	44	45	45	46	46	46	47	47	47	48	48	49	52	56	62	65	66	64	61	58	57	56

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	71	70	70	69	69	68	68	67	67	67	66	66	66	65	65	66	66	67	65	63	62	61	60
Thu	60	59	58	58	58	57	57	57	56	56	56	56	55	56	56	56	58	60	61	62	60	59	58	57
Fri	57	57	58	58	58	59	59	59	60	60	60	60	61	61	61	61	62	64	65	64	63	61	60	59
Sat	58	57	56	56	55	54	54	53	52	51	51	51	50	50	50	50	50	50	50	51	50	50	50	49
Sun	49	49	49	49	49	49	50	50	50	50	50	50	50	50	50	50	50	50	50	49	48	47	47	46
Mon	45	44	43	43	43	42	42	42	41	41	41	40	40	40	40	41	43	45	47	47	47	46	45	43
Tue	44	44	44	45	45	46	46	46	47	47	47	48	48	49	52	56	62	65	66	64	61	58	57	56