13 – 19 May 2026 · 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: 26.5 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+10.5 AQI compared with the previous week’s mean of 82.5.

Highest hourly estimate: 243 in Da Nang · 15 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, 13 May	85.4Moderate	54–194	27.3	192 / 192
Thu, 14 May	99.8Moderate	58–208	30.2	192 / 192
Fri, 15 May	112.2Unhealthy for Sensitive Groups	59–243	31	192 / 192
Sat, 16 May	97.5Moderate	51–228	27.3	192 / 192
Sun, 17 May	88.7Moderate	57–208	24.6	192 / 192
Mon, 18 May	84.6Moderate	37–223	22.2	192 / 192
Tue, 19 May	82.7Moderate	36–199	22.7	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	78	79	79	80	80	80	81	82	82	82	82	82	82	83	83	86	94	98	100	98	95	92	90	85
Thu	83	84	84	85	85	85	84	83	83	84	85	86	86	90	102	120	133	140	140	135	126	117	104	94
Fri	92	92	93	93	93	93	94	94	94	93	94	96	98	103	115	132	145	153	155	151	144	135	126	113
Sat	102	94	93	92	92	91	89	88	88	88	88	88	89	90	95	102	108	117	121	119	113	105	98	93
Sun	87	86	85	85	85	85	86	86	86	86	85	85	85	85	85	90	96	100	98	95	94	94	92	90
Mon	88	85	81	79	79	78	78	77	76	76	76	76	77	79	83	88	95	101	103	101	96	91	87	83
Tue	81	79	77	74	75	75	76	76	76	76	76	76	75	76	81	87	93	99	102	100	97	92	87	81

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	132.2Unhealthy for Sensitive Groups	243	34.6	168 / 168
Hanoi	113.5Unhealthy for Sensitive Groups	230	33.7	168 / 168
Can Tho	103.8Unhealthy for Sensitive Groups	173	36.3	168 / 168
Ho Chi Minh City	101.1Unhealthy for Sensitive Groups	166	36.2	168 / 168
Hue	89.7Moderate	183	22.5	168 / 168
Hai Phong	75Moderate	201	16.7	168 / 168
Nha Trang	72.1Moderate	124	19.3	168 / 168
Da Lat	56.4Moderate	79	12.6	168 / 168

City-hours by category

Good: 40

Moderate: 872

Unhealthy for Sensitive Groups: 299

Unhealthy: 94

Very Unhealthy: 39

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	78	79	79	80	80	80	81	82	82	82	82	82	82	83	83	86	94	98	100	98	95	92	90	85
Thu	83	84	84	85	85	85	84	83	83	84	85	86	86	90	102	120	133	140	140	135	126	117	104	94
Fri	92	92	93	93	93	93	94	94	94	93	94	96	98	103	115	132	145	153	155	151	144	135	126	113
Sat	102	94	93	92	92	91	89	88	88	88	88	88	89	90	95	102	108	117	121	119	113	105	98	93
Sun	87	86	85	85	85	85	86	86	86	86	85	85	85	85	85	90	96	100	98	95	94	94	92	90
Mon	88	85	81	79	79	78	78	77	76	76	76	76	77	79	83	88	95	101	103	101	96	91	87	83
Tue	81	79	77	74	75	75	76	76	76	76	76	76	75	76	81	87	93	99	102	100	97	92	87	81

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	78	79	79	80	80	80	81	82	82	82	82	82	82	83	83	86	94	98	100	98	95	92	90	85
Thu	83	84	84	85	85	85	84	83	83	84	85	86	86	90	102	120	133	140	140	135	126	117	104	94
Fri	92	92	93	93	93	93	94	94	94	93	94	96	98	103	115	132	145	153	155	151	144	135	126	113
Sat	102	94	93	92	92	91	89	88	88	88	88	88	89	90	95	102	108	117	121	119	113	105	98	93
Sun	87	86	85	85	85	85	86	86	86	86	85	85	85	85	85	90	96	100	98	95	94	94	92	90
Mon	88	85	81	79	79	78	78	77	76	76	76	76	77	79	83	88	95	101	103	101	96	91	87	83
Tue	81	79	77	74	75	75	76	76	76	76	76	76	75	76	81	87	93	99	102	100	97	92	87	81

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	78	79	79	80	80	80	81	82	82	82	82	82	82	83	83	86	94	98	100	98	95	92	90	85
Thu	83	84	84	85	85	85	84	83	83	84	85	86	86	90	102	120	133	140	140	135	126	117	104	94
Fri	92	92	93	93	93	93	94	94	94	93	94	96	98	103	115	132	145	153	155	151	144	135	126	113
Sat	102	94	93	92	92	91	89	88	88	88	88	88	89	90	95	102	108	117	121	119	113	105	98	93
Sun	87	86	85	85	85	85	86	86	86	86	85	85	85	85	85	90	96	100	98	95	94	94	92	90
Mon	88	85	81	79	79	78	78	77	76	76	76	76	77	79	83	88	95	101	103	101	96	91	87	83
Tue	81	79	77	74	75	75	76	76	76	76	76	76	75	76	81	87	93	99	102	100	97	92	87	81