21 – 27 May 2025 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

90.7Weekly mean modelled AQI · Moderate

Mean PM2.5: 28.7 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

-1.2 AQI compared with the previous week’s mean of 91.9.

Highest hourly estimate: 201 in Hanoi · 21 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, 21 May	99.9Moderate	57–201	30.5	192 / 192
Thu, 22 May	86.2Moderate	52–170	27	192 / 192
Fri, 23 May	99.3Moderate	52–173	31.3	192 / 192
Sat, 24 May	95.8Moderate	53–156	29.2	192 / 192
Sun, 25 May	84.9Moderate	46–163	26.5	192 / 192
Mon, 26 May	83.2Moderate	39–180	28.5	192 / 192
Tue, 27 May	85.3Moderate	37–177	28.2	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	94	94	94	95	96	96	96	96	95	94	93	92	92	94	101	111	118	122	121	116	109	100	93	89
Thu	88	88	87	86	85	84	82	80	80	80	80	80	81	81	82	90	98	102	101	96	89	84	84	84
Fri	85	86	87	88	90	91	92	92	92	92	92	92	94	99	106	115	121	124	123	119	112	104	97	93
Sat	94	94	94	95	95	95	96	96	96	96	95	95	95	95	96	100	102	103	102	99	94	92	91	91
Sun	90	89	88	87	86	86	85	85	85	84	84	84	83	84	84	85	86	86	85	84	83	83	82	82
Mon	82	82	82	83	83	83	84	83	83	83	83	83	82	82	82	83	84	86	87	85	83	83	83	82
Tue	82	82	82	81	81	80	80	81	81	82	82	83	84	85	87	90	92	94	94	93	90	88	87	87

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	160.4Unhealthy	180	70.3	168 / 168
Hanoi	114.2Unhealthy for Sensitive Groups	201	41	168 / 168
Ho Chi Minh City	107Unhealthy for Sensitive Groups	159	38.4	168 / 168
Hue	81.9Moderate	173	19.8	168 / 168
Hai Phong	80.3Moderate	107	24	168 / 168
Da Nang	63.3Moderate	172	10.4	168 / 168
Nha Trang	61.7Moderate	122	14	168 / 168
Da Lat	56.3Moderate	63	12.1	168 / 168

City-hours by category

Good: 54

Moderate: 880

Unhealthy for Sensitive Groups: 208

Unhealthy: 201

Very Unhealthy: 1

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	94	94	94	95	96	96	96	96	95	94	93	92	92	94	101	111	118	122	121	116	109	100	93	89
Thu	88	88	87	86	85	84	82	80	80	80	80	80	81	81	82	90	98	102	101	96	89	84	84	84
Fri	85	86	87	88	90	91	92	92	92	92	92	92	94	99	106	115	121	124	123	119	112	104	97	93
Sat	94	94	94	95	95	95	96	96	96	96	95	95	95	95	96	100	102	103	102	99	94	92	91	91
Sun	90	89	88	87	86	86	85	85	85	84	84	84	83	84	84	85	86	86	85	84	83	83	82	82
Mon	82	82	82	83	83	83	84	83	83	83	83	83	82	82	82	83	84	86	87	85	83	83	83	82
Tue	82	82	82	81	81	80	80	81	81	82	82	83	84	85	87	90	92	94	94	93	90	88	87	87

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	94	94	94	95	96	96	96	96	95	94	93	92	92	94	101	111	118	122	121	116	109	100	93	89
Thu	88	88	87	86	85	84	82	80	80	80	80	80	81	81	82	90	98	102	101	96	89	84	84	84
Fri	85	86	87	88	90	91	92	92	92	92	92	92	94	99	106	115	121	124	123	119	112	104	97	93
Sat	94	94	94	95	95	95	96	96	96	96	95	95	95	95	96	100	102	103	102	99	94	92	91	91
Sun	90	89	88	87	86	86	85	85	85	84	84	84	83	84	84	85	86	86	85	84	83	83	82	82
Mon	82	82	82	83	83	83	84	83	83	83	83	83	82	82	82	83	84	86	87	85	83	83	83	82
Tue	82	82	82	81	81	80	80	81	81	82	82	83	84	85	87	90	92	94	94	93	90	88	87	87

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	94	94	94	95	96	96	96	96	95	94	93	92	92	94	101	111	118	122	121	116	109	100	93	89
Thu	88	88	87	86	85	84	82	80	80	80	80	80	81	81	82	90	98	102	101	96	89	84	84	84
Fri	85	86	87	88	90	91	92	92	92	92	92	92	94	99	106	115	121	124	123	119	112	104	97	93
Sat	94	94	94	95	95	95	96	96	96	96	95	95	95	95	96	100	102	103	102	99	94	92	91	91
Sun	90	89	88	87	86	86	85	85	85	84	84	84	83	84	84	85	86	86	85	84	83	83	82	82
Mon	82	82	82	83	83	83	84	83	83	83	83	83	82	82	82	83	84	86	87	85	83	83	83	82
Tue	82	82	82	81	81	80	80	81	81	82	82	83	84	85	87	90	92	94	94	93	90	88	87	87