20 – 26 May 2026 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

94.6Weekly mean modelled AQI · Moderate

Mean PM2.5: 26.3 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+1.6 AQI compared with the previous week’s mean of 93.

Highest hourly estimate: 241 in Da Nang · 26 May, 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 May	82.9Moderate	38–182	23.3	192 / 192
Thu, 21 May	77.1Moderate	40–146	22.9	192 / 192
Fri, 22 May	92.4Moderate	51–210	28	192 / 192
Sat, 23 May	105.5Unhealthy for Sensitive Groups	53–207	32	192 / 192
Sun, 24 May	103.1Unhealthy for Sensitive Groups	57–224	27.9	192 / 192
Mon, 25 May	100.2Unhealthy for Sensitive Groups	49–228	25	192 / 192
Tue, 26 May	101.1Unhealthy for Sensitive Groups	50–241	24.8	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	75	76	77	77	77	78	78	78	78	78	78	78	78	78	83	88	94	98	99	98	95	90	84	78
Thu	76	76	76	76	75	75	75	75	75	74	74	74	74	74	75	80	85	87	87	83	79	75	75	76
Fri	76	77	77	78	79	79	80	81	82	82	83	83	86	86	92	102	113	121	123	121	117	109	100	91
Sat	88	87	88	89	90	91	92	93	94	94	94	94	94	97	108	122	133	139	140	137	131	123	113	103
Sun	99	96	94	94	93	93	92	91	90	90	90	91	92	95	103	115	125	131	132	129	123	115	106	98
Mon	93	90	87	85	84	84	83	82	81	81	83	84	84	90	100	116	130	138	142	139	130	119	107	94
Tue	88	85	81	80	80	80	79	79	79	79	80	83	86	90	104	121	135	144	147	144	138	129	116	100

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
Da Nang	131.1Unhealthy for Sensitive Groups	241	31.4	168 / 168
Can Tho	115.6Unhealthy for Sensitive Groups	161	42.5	168 / 168
Hanoi	104.1Unhealthy for Sensitive Groups	185	30.3	168 / 168
Ho Chi Minh City	102Unhealthy for Sensitive Groups	138	35.7	168 / 168
Hue	101.5Unhealthy for Sensitive Groups	201	24.1	168 / 168
Nha Trang	77.8Moderate	180	21.4	168 / 168
Hai Phong	73.9Moderate	192	14.5	168 / 168
Da Lat	50.9Moderate	64	10.3	168 / 168

City-hours by category

Good: 55

Moderate: 832

Unhealthy for Sensitive Groups: 303

Unhealthy: 122

Very Unhealthy: 32

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	75	76	77	77	77	78	78	78	78	78	78	78	78	78	83	88	94	98	99	98	95	90	84	78
Thu	76	76	76	76	75	75	75	75	75	74	74	74	74	74	75	80	85	87	87	83	79	75	75	76
Fri	76	77	77	78	79	79	80	81	82	82	83	83	86	86	92	102	113	121	123	121	117	109	100	91
Sat	88	87	88	89	90	91	92	93	94	94	94	94	94	97	108	122	133	139	140	137	131	123	113	103
Sun	99	96	94	94	93	93	92	91	90	90	90	91	92	95	103	115	125	131	132	129	123	115	106	98
Mon	93	90	87	85	84	84	83	82	81	81	83	84	84	90	100	116	130	138	142	139	130	119	107	94
Tue	88	85	81	80	80	80	79	79	79	79	80	83	86	90	104	121	135	144	147	144	138	129	116	100

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	75	76	77	77	77	78	78	78	78	78	78	78	78	78	83	88	94	98	99	98	95	90	84	78
Thu	76	76	76	76	75	75	75	75	75	74	74	74	74	74	75	80	85	87	87	83	79	75	75	76
Fri	76	77	77	78	79	79	80	81	82	82	83	83	86	86	92	102	113	121	123	121	117	109	100	91
Sat	88	87	88	89	90	91	92	93	94	94	94	94	94	97	108	122	133	139	140	137	131	123	113	103
Sun	99	96	94	94	93	93	92	91	90	90	90	91	92	95	103	115	125	131	132	129	123	115	106	98
Mon	93	90	87	85	84	84	83	82	81	81	83	84	84	90	100	116	130	138	142	139	130	119	107	94
Tue	88	85	81	80	80	80	79	79	79	79	80	83	86	90	104	121	135	144	147	144	138	129	116	100

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	75	76	77	77	77	78	78	78	78	78	78	78	78	78	83	88	94	98	99	98	95	90	84	78
Thu	76	76	76	76	75	75	75	75	75	74	74	74	74	74	75	80	85	87	87	83	79	75	75	76
Fri	76	77	77	78	79	79	80	81	82	82	83	83	86	86	92	102	113	121	123	121	117	109	100	91
Sat	88	87	88	89	90	91	92	93	94	94	94	94	94	97	108	122	133	139	140	137	131	123	113	103
Sun	99	96	94	94	93	93	92	91	90	90	90	91	92	95	103	115	125	131	132	129	123	115	106	98
Mon	93	90	87	85	84	84	83	82	81	81	83	84	84	90	100	116	130	138	142	139	130	119	107	94
Tue	88	85	81	80	80	80	79	79	79	79	80	83	86	90	104	121	135	144	147	144	138	129	116	100