14 – 20 May 2025 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

91.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 28 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

-12.2 AQI compared with the previous week’s mean of 104.1.

Highest hourly estimate: 211 in Hanoi · 20 May, 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, 14 May	95.7Moderate	55–182	27.6	192 / 192
Thu, 15 May	90.1Moderate	59–159	28.5	192 / 192
Fri, 16 May	87.5Moderate	51–170	27.1	192 / 192
Sat, 17 May	87.6Moderate	56–167	25.2	192 / 192
Sun, 18 May	90.6Moderate	57–174	27.7	192 / 192
Mon, 19 May	92.1Moderate	56–161	27.4	192 / 192
Tue, 20 May	99.6Moderate	59–211	32.2	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	95	94	93	92	91	89	88	88	88	88	89	91	95	97	103	107	110	112	111	105	99	94	90	87
Thu	86	86	86	86	86	86	87	87	87	87	87	87	87	91	94	96	100	103	102	98	94	88	87	87
Fri	87	86	86	85	84	84	83	83	83	83	83	83	83	85	89	95	99	101	100	96	91	86	83	82
Sat	82	82	83	83	83	82	81	81	80	80	80	80	82	86	91	97	101	105	106	103	98	91	85	83
Sun	83	82	82	81	81	82	83	84	85	85	85	85	87	90	96	103	107	109	108	105	100	95	90	88
Mon	88	88	88	89	89	89	89	90	90	90	89	89	89	92	95	99	104	105	104	100	96	91	85	85
Tue	85	84	84	85	85	85	85	86	87	87	88	93	94	100	105	115	125	130	130	126	120	112	102	98

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	155.6Unhealthy	170	66.5	168 / 168
Hanoi	120.9Unhealthy for Sensitive Groups	211	42.5	168 / 168
Hue	101.1Unhealthy for Sensitive Groups	174	29.1	168 / 168
Da Nang	91.3Moderate	202	16.2	168 / 168
Ho Chi Minh City	78.4Moderate	94	23.6	168 / 168
Hai Phong	63.8Moderate	108	15.2	168 / 168
Nha Trang	63.4Moderate	69	16	168 / 168
Da Lat	60.6Moderate	65	14.6	168 / 168

City-hours by category

Good: 0

Moderate: 924

Unhealthy for Sensitive Groups: 225

Unhealthy: 189

Very Unhealthy: 6

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	95	94	93	92	91	89	88	88	88	88	89	91	95	97	103	107	110	112	111	105	99	94	90	87
Thu	86	86	86	86	86	86	87	87	87	87	87	87	87	91	94	96	100	103	102	98	94	88	87	87
Fri	87	86	86	85	84	84	83	83	83	83	83	83	83	85	89	95	99	101	100	96	91	86	83	82
Sat	82	82	83	83	83	82	81	81	80	80	80	80	82	86	91	97	101	105	106	103	98	91	85	83
Sun	83	82	82	81	81	82	83	84	85	85	85	85	87	90	96	103	107	109	108	105	100	95	90	88
Mon	88	88	88	89	89	89	89	90	90	90	89	89	89	92	95	99	104	105	104	100	96	91	85	85
Tue	85	84	84	85	85	85	85	86	87	87	88	93	94	100	105	115	125	130	130	126	120	112	102	98

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	95	94	93	92	91	89	88	88	88	88	89	91	95	97	103	107	110	112	111	105	99	94	90	87
Thu	86	86	86	86	86	86	87	87	87	87	87	87	87	91	94	96	100	103	102	98	94	88	87	87
Fri	87	86	86	85	84	84	83	83	83	83	83	83	83	85	89	95	99	101	100	96	91	86	83	82
Sat	82	82	83	83	83	82	81	81	80	80	80	80	82	86	91	97	101	105	106	103	98	91	85	83
Sun	83	82	82	81	81	82	83	84	85	85	85	85	87	90	96	103	107	109	108	105	100	95	90	88
Mon	88	88	88	89	89	89	89	90	90	90	89	89	89	92	95	99	104	105	104	100	96	91	85	85
Tue	85	84	84	85	85	85	85	86	87	87	88	93	94	100	105	115	125	130	130	126	120	112	102	98

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	95	94	93	92	91	89	88	88	88	88	89	91	95	97	103	107	110	112	111	105	99	94	90	87
Thu	86	86	86	86	86	86	87	87	87	87	87	87	87	91	94	96	100	103	102	98	94	88	87	87
Fri	87	86	86	85	84	84	83	83	83	83	83	83	83	85	89	95	99	101	100	96	91	86	83	82
Sat	82	82	83	83	83	82	81	81	80	80	80	80	82	86	91	97	101	105	106	103	98	91	85	83
Sun	83	82	82	81	81	82	83	84	85	85	85	85	87	90	96	103	107	109	108	105	100	95	90	88
Mon	88	88	88	89	89	89	89	90	90	90	89	89	89	92	95	99	104	105	104	100	96	91	85	85
Tue	85	84	84	85	85	85	85	86	87	87	88	93	94	100	105	115	125	130	130	126	120	112	102	98