9 – 15 Aug 2023 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

81.2Weekly mean modelled AQI · Moderate

Mean PM2.5: 22.6 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+15.3 AQI compared with the previous week’s mean of 65.9.

Highest hourly estimate: 223 in Hanoi · 13 Aug, 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, 9 Aug	68.3Moderate	40–166	15.7	192 / 192
Thu, 10 Aug	80.9Moderate	36–215	26.3	192 / 192
Fri, 11 Aug	90.8Moderate	37–187	25.7	192 / 192
Sat, 12 Aug	83Moderate	38–182	22.9	192 / 192
Sun, 13 Aug	89.3Moderate	32–223	29.1	192 / 192
Mon, 14 Aug	82.7Moderate	33–198	20.1	192 / 192
Tue, 15 Aug	73.2Moderate	31–176	18.1	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	64	62	62	62	62	61	61	61	60	60	60	60	59	59	59	66	77	86	91	91	88	82	74	70
Thu	69	67	66	65	65	66	67	68	69	69	69	70	71	71	74	83	93	102	108	111	111	110	104	96
Fri	93	91	89	87	85	85	85	85	85	85	85	85	85	84	84	88	92	99	105	106	106	103	97	94
Sat	92	89	87	84	80	77	75	74	74	74	73	74	74	74	74	75	80	91	98	100	100	96	90	87
Sun	84	81	79	79	79	80	80	81	82	82	82	83	83	83	84	94	103	108	110	110	108	103	97	91
Mon	87	83	83	83	82	82	82	81	80	79	78	77	76	75	77	81	84	87	91	93	92	89	84	80
Tue	77	75	73	71	70	70	70	70	69	69	69	68	68	68	68	71	74	78	82	83	81	80	78	77

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	144.3Unhealthy for Sensitive Groups	223	53.2	168 / 168
Hai Phong	125.4Unhealthy for Sensitive Groups	215	47	168 / 168
Da Nang	105.1Unhealthy for Sensitive Groups	198	18.2	168 / 168
Ho Chi Minh City	65Moderate	72	17.2	168 / 168
Nha Trang	64.5Moderate	122	14.6	168 / 168
Hue	62.1Moderate	72	15.5	168 / 168
Da Lat	45.4Good	53	8.1	168 / 168
Can Tho	37.6Good	50	6.6	168 / 168

City-hours by category

Good: 316

Moderate: 703

Unhealthy for Sensitive Groups: 135

Unhealthy: 174

Very Unhealthy: 16

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	64	62	62	62	62	61	61	61	60	60	60	60	59	59	59	66	77	86	91	91	88	82	74	70
Thu	69	67	66	65	65	66	67	68	69	69	69	70	71	71	74	83	93	102	108	111	111	110	104	96
Fri	93	91	89	87	85	85	85	85	85	85	85	85	85	84	84	88	92	99	105	106	106	103	97	94
Sat	92	89	87	84	80	77	75	74	74	74	73	74	74	74	74	75	80	91	98	100	100	96	90	87
Sun	84	81	79	79	79	80	80	81	82	82	82	83	83	83	84	94	103	108	110	110	108	103	97	91
Mon	87	83	83	83	82	82	82	81	80	79	78	77	76	75	77	81	84	87	91	93	92	89	84	80
Tue	77	75	73	71	70	70	70	70	69	69	69	68	68	68	68	71	74	78	82	83	81	80	78	77

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	64	62	62	62	62	61	61	61	60	60	60	60	59	59	59	66	77	86	91	91	88	82	74	70
Thu	69	67	66	65	65	66	67	68	69	69	69	70	71	71	74	83	93	102	108	111	111	110	104	96
Fri	93	91	89	87	85	85	85	85	85	85	85	85	85	84	84	88	92	99	105	106	106	103	97	94
Sat	92	89	87	84	80	77	75	74	74	74	73	74	74	74	74	75	80	91	98	100	100	96	90	87
Sun	84	81	79	79	79	80	80	81	82	82	82	83	83	83	84	94	103	108	110	110	108	103	97	91
Mon	87	83	83	83	82	82	82	81	80	79	78	77	76	75	77	81	84	87	91	93	92	89	84	80
Tue	77	75	73	71	70	70	70	70	69	69	69	68	68	68	68	71	74	78	82	83	81	80	78	77

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	64	62	62	62	62	61	61	61	60	60	60	60	59	59	59	66	77	86	91	91	88	82	74	70
Thu	69	67	66	65	65	66	67	68	69	69	69	70	71	71	74	83	93	102	108	111	111	110	104	96
Fri	93	91	89	87	85	85	85	85	85	85	85	85	85	84	84	88	92	99	105	106	106	103	97	94
Sat	92	89	87	84	80	77	75	74	74	74	73	74	74	74	74	75	80	91	98	100	100	96	90	87
Sun	84	81	79	79	79	80	80	81	82	82	82	83	83	83	84	94	103	108	110	110	108	103	97	91
Mon	87	83	83	83	82	82	82	81	80	79	78	77	76	75	77	81	84	87	91	93	92	89	84	80
Tue	77	75	73	71	70	70	70	70	69	69	69	68	68	68	68	71	74	78	82	83	81	80	78	77