15 – 21 Jan 2025 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

101.1Weekly mean modelled AQI · Unhealthy for Sensitive Groups

Mean PM2.5: 36.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+8.5 AQI compared with the previous week’s mean of 92.6.

Highest hourly estimate: 202 in Hanoi · 20 Jan, 19:00 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, 15 Jan	93.2Moderate	26–165	29.3	192 / 192
Thu, 16 Jan	92Moderate	31–161	31.5	192 / 192
Fri, 17 Jan	97.2Moderate	40–184	33.1	192 / 192
Sat, 18 Jan	97.8Moderate	45–172	37.7	192 / 192
Sun, 19 Jan	111.4Unhealthy for Sensitive Groups	49–194	43.9	192 / 192
Mon, 20 Jan	107.2Unhealthy for Sensitive Groups	46–202	41.4	192 / 192
Tue, 21 Jan	108.8Unhealthy for Sensitive Groups	51–197	38	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	100	98	98	97	96	96	95	95	94	93	93	92	92	91	91	91	91	91	92	93	91	89	89	88
Thu	88	87	87	87	87	87	88	89	89	89	90	90	91	92	92	93	94	96	98	101	100	99	97	96
Fri	95	95	95	95	96	96	96	96	97	97	97	97	97	97	97	97	98	100	103	103	100	98	96	96
Sat	95	94	94	94	93	93	94	94	95	95	96	96	97	98	99	100	100	101	103	104	103	103	104	105
Sun	106	107	108	109	109	110	111	112	112	112	112	112	111	111	111	112	113	115	118	117	116	112	111	110
Mon	109	108	108	108	107	107	107	106	105	105	104	104	104	105	106	107	108	111	112	111	110	109	108	107
Tue	106	105	105	104	104	103	103	102	101	102	102	102	102	103	104	107	114	124	130	129	124	118	113	108

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
Hanoi	174.3Unhealthy	202	89.4	168 / 168
Hai Phong	145Unhealthy for Sensitive Groups	164	58.5	168 / 168
Ho Chi Minh City	107.7Unhealthy for Sensitive Groups	170	34.5	168 / 168
Can Tho	107.4Unhealthy for Sensitive Groups	153	37.6	168 / 168
Da Nang	87Moderate	144	22.5	168 / 168
Hue	84.4Moderate	108	26.8	168 / 168
Nha Trang	57.6Moderate	88	13.8	168 / 168
Da Lat	45.4Good	72	8.2	168 / 168

City-hours by category

Good: 139

Moderate: 641

Unhealthy for Sensitive Groups: 292

Unhealthy: 267

Very Unhealthy: 5

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	100	98	98	97	96	96	95	95	94	93	93	92	92	91	91	91	91	91	92	93	91	89	89	88
Thu	88	87	87	87	87	87	88	89	89	89	90	90	91	92	92	93	94	96	98	101	100	99	97	96
Fri	95	95	95	95	96	96	96	96	97	97	97	97	97	97	97	97	98	100	103	103	100	98	96	96
Sat	95	94	94	94	93	93	94	94	95	95	96	96	97	98	99	100	100	101	103	104	103	103	104	105
Sun	106	107	108	109	109	110	111	112	112	112	112	112	111	111	111	112	113	115	118	117	116	112	111	110
Mon	109	108	108	108	107	107	107	106	105	105	104	104	104	105	106	107	108	111	112	111	110	109	108	107
Tue	106	105	105	104	104	103	103	102	101	102	102	102	102	103	104	107	114	124	130	129	124	118	113	108

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	100	98	98	97	96	96	95	95	94	93	93	92	92	91	91	91	91	91	92	93	91	89	89	88
Thu	88	87	87	87	87	87	88	89	89	89	90	90	91	92	92	93	94	96	98	101	100	99	97	96
Fri	95	95	95	95	96	96	96	96	97	97	97	97	97	97	97	97	98	100	103	103	100	98	96	96
Sat	95	94	94	94	93	93	94	94	95	95	96	96	97	98	99	100	100	101	103	104	103	103	104	105
Sun	106	107	108	109	109	110	111	112	112	112	112	112	111	111	111	112	113	115	118	117	116	112	111	110
Mon	109	108	108	108	107	107	107	106	105	105	104	104	104	105	106	107	108	111	112	111	110	109	108	107
Tue	106	105	105	104	104	103	103	102	101	102	102	102	102	103	104	107	114	124	130	129	124	118	113	108

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	100	98	98	97	96	96	95	95	94	93	93	92	92	91	91	91	91	91	92	93	91	89	89	88
Thu	88	87	87	87	87	87	88	89	89	89	90	90	91	92	92	93	94	96	98	101	100	99	97	96
Fri	95	95	95	95	96	96	96	96	97	97	97	97	97	97	97	97	98	100	103	103	100	98	96	96
Sat	95	94	94	94	93	93	94	94	95	95	96	96	97	98	99	100	100	101	103	104	103	103	104	105
Sun	106	107	108	109	109	110	111	112	112	112	112	112	111	111	111	112	113	115	118	117	116	112	111	110
Mon	109	108	108	108	107	107	107	106	105	105	104	104	104	105	106	107	108	111	112	111	110	109	108	107
Tue	106	105	105	104	104	103	103	102	101	102	102	102	102	103	104	107	114	124	130	129	124	118	113	108