31 May – 6 Jun 2023 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

80.2Weekly mean modelled AQI · Moderate

Mean PM2.5: 23.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+3.3 AQI compared with the previous week’s mean of 76.9.

Highest hourly estimate: 211 in Hanoi · 2 Jun, 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, 31 May	73.6Moderate	39–167	20.6	192 / 192
Thu, 1 Jun	70.3Moderate	32–101	19.2	192 / 192
Fri, 2 Jun	82.2Moderate	36–211	23.1	192 / 192
Sat, 3 Jun	91.8Moderate	38–202	27.3	192 / 192
Sun, 4 Jun	85Moderate	41–155	25.4	192 / 192
Mon, 5 Jun	82.4Moderate	37–151	23.9	192 / 192
Tue, 6 Jun	75.8Moderate	24–150	22.1	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	70	70	70	70	70	70	70	70	70	70	71	71	71	71	75	78	81	82	83	82	80	77	75	72
Thu	71	71	71	71	71	71	71	70	70	70	70	70	69	69	69	69	69	68	70	71	73	73	72	71
Fri	69	68	69	70	69	69	69	69	69	69	69	69	70	72	81	90	100	108	112	111	107	104	99	93
Sat	87	81	78	78	79	79	79	80	80	80	80	81	81	84	86	93	106	116	121	122	119	113	105	97
Sun	90	86	85	84	84	84	84	84	84	84	84	84	84	84	84	85	87	89	91	89	85	83	82	82
Mon	82	82	83	83	83	83	84	84	84	84	84	83	83	83	82	81	81	80	82	83	83	82	81	79
Tue	79	78	78	78	77	77	76	76	75	75	75	75	75	74	75	75	75	76	76	76	75	74	74	74

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
Hai Phong	128.1Unhealthy for Sensitive Groups	167	48.6	168 / 168
Hanoi	111.3Unhealthy for Sensitive Groups	211	34.7	168 / 168
Da Nang	89.8Moderate	200	22.3	168 / 168
Ho Chi Minh City	75.9Moderate	86	22.8	168 / 168
Nha Trang	74.7Moderate	140	20.7	168 / 168
Hue	70.2Moderate	110	18.5	168 / 168
Can Tho	51.4Moderate	57	10.2	168 / 168
Da Lat	40Good	51	6.9	168 / 168

City-hours by category

Good: 214

Moderate: 842

Unhealthy for Sensitive Groups: 225

Unhealthy: 56

Very Unhealthy: 7

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	70	70	70	70	70	70	70	70	70	70	71	71	71	71	75	78	81	82	83	82	80	77	75	72
Thu	71	71	71	71	71	71	71	70	70	70	70	70	69	69	69	69	69	68	70	71	73	73	72	71
Fri	69	68	69	70	69	69	69	69	69	69	69	69	70	72	81	90	100	108	112	111	107	104	99	93
Sat	87	81	78	78	79	79	79	80	80	80	80	81	81	84	86	93	106	116	121	122	119	113	105	97
Sun	90	86	85	84	84	84	84	84	84	84	84	84	84	84	84	85	87	89	91	89	85	83	82	82
Mon	82	82	83	83	83	83	84	84	84	84	84	83	83	83	82	81	81	80	82	83	83	82	81	79
Tue	79	78	78	78	77	77	76	76	75	75	75	75	75	74	75	75	75	76	76	76	75	74	74	74

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	70	70	70	70	70	70	70	70	70	70	71	71	71	71	75	78	81	82	83	82	80	77	75	72
Thu	71	71	71	71	71	71	71	70	70	70	70	70	69	69	69	69	69	68	70	71	73	73	72	71
Fri	69	68	69	70	69	69	69	69	69	69	69	69	70	72	81	90	100	108	112	111	107	104	99	93
Sat	87	81	78	78	79	79	79	80	80	80	80	81	81	84	86	93	106	116	121	122	119	113	105	97
Sun	90	86	85	84	84	84	84	84	84	84	84	84	84	84	84	85	87	89	91	89	85	83	82	82
Mon	82	82	83	83	83	83	84	84	84	84	84	83	83	83	82	81	81	80	82	83	83	82	81	79
Tue	79	78	78	78	77	77	76	76	75	75	75	75	75	74	75	75	75	76	76	76	75	74	74	74

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	70	70	70	70	70	70	70	70	70	70	71	71	71	71	75	78	81	82	83	82	80	77	75	72
Thu	71	71	71	71	71	71	71	70	70	70	70	70	69	69	69	69	69	68	70	71	73	73	72	71
Fri	69	68	69	70	69	69	69	69	69	69	69	69	70	72	81	90	100	108	112	111	107	104	99	93
Sat	87	81	78	78	79	79	79	80	80	80	80	81	81	84	86	93	106	116	121	122	119	113	105	97
Sun	90	86	85	84	84	84	84	84	84	84	84	84	84	84	84	85	87	89	91	89	85	83	82	82
Mon	82	82	83	83	83	83	84	84	84	84	84	83	83	83	82	81	81	80	82	83	83	82	81	79
Tue	79	78	78	78	77	77	76	76	75	75	75	75	75	74	75	75	75	76	76	76	75	74	74	74