19 – 25 Mar 2025 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

113.4Weekly mean modelled AQI · Unhealthy for Sensitive Groups

Mean PM2.5: 41.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+34.2 AQI compared with the previous week’s mean of 79.2.

Highest hourly estimate: 203 in Hanoi · 22 Mar, 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, 19 Mar	91.8Moderate	42–166	35.1	192 / 192
Thu, 20 Mar	121.5Unhealthy for Sensitive Groups	51–200	45.3	192 / 192
Fri, 21 Mar	125.9Unhealthy for Sensitive Groups	55–186	53.1	192 / 192
Sat, 22 Mar	126Unhealthy for Sensitive Groups	62–203	45.2	192 / 192
Sun, 23 Mar	109.8Unhealthy for Sensitive Groups	57–183	38.2	192 / 192
Mon, 24 Mar	112.7Unhealthy for Sensitive Groups	60–196	43	192 / 192
Tue, 25 Mar	105.7Unhealthy for Sensitive Groups	57–192	29.9	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	82	82	82	82	82	82	83	84	84	84	85	86	86	87	88	92	101	109	112	113	111	107	102	100
Thu	100	102	104	107	110	113	116	118	120	121	122	122	122	122	122	122	127	136	140	142	140	136	130	124
Fri	123	122	122	121	121	120	120	120	121	122	122	123	123	124	124	125	128	135	139	140	137	133	130	128
Sat	128	128	128	128	128	128	127	127	127	126	126	126	126	126	125	127	128	130	133	130	126	120	115	114
Sun	112	111	110	109	108	107	107	106	105	104	103	103	102	104	106	108	114	123	128	125	120	114	108	102
Mon	101	101	101	101	102	103	104	105	106	106	106	106	106	106	108	117	126	137	141	139	132	125	118	111
Tue	106	106	106	105	104	104	102	101	100	98	97	97	96	96	99	109	119	126	127	124	116	107	99	92

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	157Unhealthy	203	76.5	168 / 168
Hai Phong	149.9Unhealthy for Sensitive Groups	187	68.9	168 / 168
Can Tho	122.5Unhealthy for Sensitive Groups	200	42.3	168 / 168
Hue	121.2Unhealthy for Sensitive Groups	192	43	168 / 168
Ho Chi Minh City	109.7Unhealthy for Sensitive Groups	196	32.5	168 / 168
Da Nang	108.6Unhealthy for Sensitive Groups	165	31.5	168 / 168
Nha Trang	75.7Moderate	97	22.6	168 / 168
Da Lat	62.2Moderate	113	14	168 / 168

City-hours by category

Good: 17

Moderate: 634

Unhealthy for Sensitive Groups: 325

Unhealthy: 366

Very Unhealthy: 2

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	82	82	82	82	82	82	83	84	84	84	85	86	86	87	88	92	101	109	112	113	111	107	102	100
Thu	100	102	104	107	110	113	116	118	120	121	122	122	122	122	122	122	127	136	140	142	140	136	130	124
Fri	123	122	122	121	121	120	120	120	121	122	122	123	123	124	124	125	128	135	139	140	137	133	130	128
Sat	128	128	128	128	128	128	127	127	127	126	126	126	126	126	125	127	128	130	133	130	126	120	115	114
Sun	112	111	110	109	108	107	107	106	105	104	103	103	102	104	106	108	114	123	128	125	120	114	108	102
Mon	101	101	101	101	102	103	104	105	106	106	106	106	106	106	108	117	126	137	141	139	132	125	118	111
Tue	106	106	106	105	104	104	102	101	100	98	97	97	96	96	99	109	119	126	127	124	116	107	99	92

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	82	82	82	82	82	82	83	84	84	84	85	86	86	87	88	92	101	109	112	113	111	107	102	100
Thu	100	102	104	107	110	113	116	118	120	121	122	122	122	122	122	122	127	136	140	142	140	136	130	124
Fri	123	122	122	121	121	120	120	120	121	122	122	123	123	124	124	125	128	135	139	140	137	133	130	128
Sat	128	128	128	128	128	128	127	127	127	126	126	126	126	126	125	127	128	130	133	130	126	120	115	114
Sun	112	111	110	109	108	107	107	106	105	104	103	103	102	104	106	108	114	123	128	125	120	114	108	102
Mon	101	101	101	101	102	103	104	105	106	106	106	106	106	106	108	117	126	137	141	139	132	125	118	111
Tue	106	106	106	105	104	104	102	101	100	98	97	97	96	96	99	109	119	126	127	124	116	107	99	92

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	82	82	82	82	82	82	83	84	84	84	85	86	86	87	88	92	101	109	112	113	111	107	102	100
Thu	100	102	104	107	110	113	116	118	120	121	122	122	122	122	122	122	127	136	140	142	140	136	130	124
Fri	123	122	122	121	121	120	120	120	121	122	122	123	123	124	124	125	128	135	139	140	137	133	130	128
Sat	128	128	128	128	128	128	127	127	127	126	126	126	126	126	125	127	128	130	133	130	126	120	115	114
Sun	112	111	110	109	108	107	107	106	105	104	103	103	102	104	106	108	114	123	128	125	120	114	108	102
Mon	101	101	101	101	102	103	104	105	106	106	106	106	106	106	108	117	126	137	141	139	132	125	118	111
Tue	106	106	106	105	104	104	102	101	100	98	97	97	96	96	99	109	119	126	127	124	116	107	99	92