19 – 25 Apr 2023 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

99.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 32.8 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

-13.7 AQI compared with the previous week’s mean of 113.

Highest hourly estimate: 244 in Hai Phong · 21 Apr, 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 Apr	105.9Unhealthy for Sensitive Groups	54–204	38.6	192 / 192
Thu, 20 Apr	113.9Unhealthy for Sensitive Groups	55–196	42.8	192 / 192
Fri, 21 Apr	124.6Unhealthy for Sensitive Groups	71–244	52.3	192 / 192
Sat, 22 Apr	114.2Unhealthy for Sensitive Groups	69–187	34.4	192 / 192
Sun, 23 Apr	93.9Moderate	60–148	26.1	192 / 192
Mon, 24 Apr	76.5Moderate	53–112	19.3	192 / 192
Tue, 25 Apr	66.5Moderate	50–90	16.2	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	103	102	102	101	101	100	100	99	99	99	100	100	100	101	103	108	112	119	124	123	119	113	108	108
Thu	109	110	110	111	112	112	113	113	113	113	113	112	111	111	111	111	114	119	123	123	122	119	115	115
Fri	115	116	116	117	117	117	118	118	118	119	119	120	120	121	122	125	132	139	143	144	142	138	130	125
Sat	122	122	121	120	120	119	119	118	118	117	117	116	116	115	114	112	110	109	111	110	107	105	103	102
Sun	101	101	100	100	100	99	98	98	98	97	96	95	94	93	92	91	89	89	91	91	88	85	84	84
Mon	83	82	81	81	80	80	80	79	79	78	78	77	77	76	75	75	74	73	74	73	72	70	70	70
Tue	69	69	69	69	69	68	68	68	68	68	67	67	67	66	66	66	65	65	65	64	64	64	64	64

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	135.1Unhealthy for Sensitive Groups	210	51.4	168 / 168
Hai Phong	128.9Unhealthy for Sensitive Groups	244	49.3	168 / 168
Da Nang	125.3Unhealthy for Sensitive Groups	217	42.6	168 / 168
Hue	107.4Unhealthy for Sensitive Groups	168	34.1	168 / 168
Ho Chi Minh City	79.9Moderate	104	24.6	168 / 168
Can Tho	78.3Moderate	96	23	168 / 168
Da Lat	71.4Moderate	95	19.2	168 / 168
Nha Trang	68.3Moderate	92	18.3	168 / 168

City-hours by category

Good: 5

Moderate: 872

Unhealthy for Sensitive Groups: 266

Unhealthy: 182

Very Unhealthy: 19

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	103	102	102	101	101	100	100	99	99	99	100	100	100	101	103	108	112	119	124	123	119	113	108	108
Thu	109	110	110	111	112	112	113	113	113	113	113	112	111	111	111	111	114	119	123	123	122	119	115	115
Fri	115	116	116	117	117	117	118	118	118	119	119	120	120	121	122	125	132	139	143	144	142	138	130	125
Sat	122	122	121	120	120	119	119	118	118	117	117	116	116	115	114	112	110	109	111	110	107	105	103	102
Sun	101	101	100	100	100	99	98	98	98	97	96	95	94	93	92	91	89	89	91	91	88	85	84	84
Mon	83	82	81	81	80	80	80	79	79	78	78	77	77	76	75	75	74	73	74	73	72	70	70	70
Tue	69	69	69	69	69	68	68	68	68	68	67	67	67	66	66	66	65	65	65	64	64	64	64	64

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	103	102	102	101	101	100	100	99	99	99	100	100	100	101	103	108	112	119	124	123	119	113	108	108
Thu	109	110	110	111	112	112	113	113	113	113	113	112	111	111	111	111	114	119	123	123	122	119	115	115
Fri	115	116	116	117	117	117	118	118	118	119	119	120	120	121	122	125	132	139	143	144	142	138	130	125
Sat	122	122	121	120	120	119	119	118	118	117	117	116	116	115	114	112	110	109	111	110	107	105	103	102
Sun	101	101	100	100	100	99	98	98	98	97	96	95	94	93	92	91	89	89	91	91	88	85	84	84
Mon	83	82	81	81	80	80	80	79	79	78	78	77	77	76	75	75	74	73	74	73	72	70	70	70
Tue	69	69	69	69	69	68	68	68	68	68	67	67	67	66	66	66	65	65	65	64	64	64	64	64

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	103	102	102	101	101	100	100	99	99	99	100	100	100	101	103	108	112	119	124	123	119	113	108	108
Thu	109	110	110	111	112	112	113	113	113	113	113	112	111	111	111	111	114	119	123	123	122	119	115	115
Fri	115	116	116	117	117	117	118	118	118	119	119	120	120	121	122	125	132	139	143	144	142	138	130	125
Sat	122	122	121	120	120	119	119	118	118	117	117	116	116	115	114	112	110	109	111	110	107	105	103	102
Sun	101	101	100	100	100	99	98	98	98	97	96	95	94	93	92	91	89	89	91	91	88	85	84	84
Mon	83	82	81	81	80	80	80	79	79	78	78	77	77	76	75	75	74	73	74	73	72	70	70	70
Tue	69	69	69	69	69	68	68	68	68	68	67	67	67	66	66	66	65	65	65	64	64	64	64	64