26 Mar – 1 Apr 2025 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

93Weekly mean modelled AQI · Moderate

Mean PM2.5: 29.3 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

-20.4 AQI compared with the previous week’s mean of 113.4.

Highest hourly estimate: 224 in Da Nang · 27 Mar, 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, 26 Mar	105Unhealthy for Sensitive Groups	58–199	33.8	192 / 192
Thu, 27 Mar	109.6Unhealthy for Sensitive Groups	74–224	36.6	192 / 192
Fri, 28 Mar	113Unhealthy for Sensitive Groups	71–215	38.4	192 / 192
Sat, 29 Mar	97.7Moderate	59–163	23.1	192 / 192
Sun, 30 Mar	64.9Moderate	50–95	16.5	192 / 192
Mon, 31 Mar	71.7Moderate	32–136	26.5	192 / 192
Tue, 1 Apr	89.2Moderate	25–154	30.1	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	91	91	92	92	93	94	94	95	96	97	97	97	97	99	104	115	125	132	135	132	125	117	110	102
Thu	99	99	99	99	98	98	97	96	96	96	96	101	103	105	111	119	126	133	137	136	133	127	116	109
Fri	105	105	105	105	105	106	107	107	108	108	108	108	108	109	115	120	128	131	132	131	126	119	111	107
Sat	107	107	108	108	108	107	107	106	106	105	104	102	100	98	96	94	92	92	90	86	83	82	80	78
Sun	77	75	73	71	69	67	66	64	63	62	61	61	61	61	61	61	62	62	63	64	64	64	63	64
Mon	64	65	65	65	66	67	68	69	70	70	71	72	72	72	72	73	73	74	75	76	78	80	82	84
Tue	85	86	86	87	87	87	87	87	88	88	89	89	90	90	91	91	91	92	92	93	93	93	92	92

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
Can Tho	117.5Unhealthy for Sensitive Groups	154	42.8	168 / 168
Hanoi	116.1Unhealthy for Sensitive Groups	171	42	168 / 168
Hue	109.1Unhealthy for Sensitive Groups	215	35.8	168 / 168
Hai Phong	97.5Moderate	146	34.5	168 / 168
Da Nang	88.6Moderate	224	20.1	168 / 168
Ho Chi Minh City	81.9Moderate	128	26.2	168 / 168
Nha Trang	69.5Moderate	112	17.2	168 / 168
Da Lat	64Moderate	122	15.6	168 / 168

City-hours by category

Good: 68

Moderate: 802

Unhealthy for Sensitive Groups: 376

Unhealthy: 79

Very Unhealthy: 19

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	91	91	92	92	93	94	94	95	96	97	97	97	97	99	104	115	125	132	135	132	125	117	110	102
Thu	99	99	99	99	98	98	97	96	96	96	96	101	103	105	111	119	126	133	137	136	133	127	116	109
Fri	105	105	105	105	105	106	107	107	108	108	108	108	108	109	115	120	128	131	132	131	126	119	111	107
Sat	107	107	108	108	108	107	107	106	106	105	104	102	100	98	96	94	92	92	90	86	83	82	80	78
Sun	77	75	73	71	69	67	66	64	63	62	61	61	61	61	61	61	62	62	63	64	64	64	63	64
Mon	64	65	65	65	66	67	68	69	70	70	71	72	72	72	72	73	73	74	75	76	78	80	82	84
Tue	85	86	86	87	87	87	87	87	88	88	89	89	90	90	91	91	91	92	92	93	93	93	92	92

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	91	91	92	92	93	94	94	95	96	97	97	97	97	99	104	115	125	132	135	132	125	117	110	102
Thu	99	99	99	99	98	98	97	96	96	96	96	101	103	105	111	119	126	133	137	136	133	127	116	109
Fri	105	105	105	105	105	106	107	107	108	108	108	108	108	109	115	120	128	131	132	131	126	119	111	107
Sat	107	107	108	108	108	107	107	106	106	105	104	102	100	98	96	94	92	92	90	86	83	82	80	78
Sun	77	75	73	71	69	67	66	64	63	62	61	61	61	61	61	61	62	62	63	64	64	64	63	64
Mon	64	65	65	65	66	67	68	69	70	70	71	72	72	72	72	73	73	74	75	76	78	80	82	84
Tue	85	86	86	87	87	87	87	87	88	88	89	89	90	90	91	91	91	92	92	93	93	93	92	92

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	91	91	92	92	93	94	94	95	96	97	97	97	97	99	104	115	125	132	135	132	125	117	110	102
Thu	99	99	99	99	98	98	97	96	96	96	96	101	103	105	111	119	126	133	137	136	133	127	116	109
Fri	105	105	105	105	105	106	107	107	108	108	108	108	108	109	115	120	128	131	132	131	126	119	111	107
Sat	107	107	108	108	108	107	107	106	106	105	104	102	100	98	96	94	92	92	90	86	83	82	80	78
Sun	77	75	73	71	69	67	66	64	63	62	61	61	61	61	61	61	62	62	63	64	64	64	63	64
Mon	64	65	65	65	66	67	68	69	70	70	71	72	72	72	72	73	73	74	75	76	78	80	82	84
Tue	85	86	86	87	87	87	87	87	88	88	89	89	90	90	91	91	91	92	92	93	93	93	92	92