18 – 24 Jan 2023 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

85.7Weekly mean modelled AQI · Moderate

Mean PM2.5: 27.8 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+2 AQI compared with the previous week’s mean of 83.7.

Highest hourly estimate: 169 in Hanoi · 21 Jan, 21:00 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, 18 Jan	78.5Moderate	37–141	24.3	192 / 192
Thu, 19 Jan	81.3Moderate	37–135	26.4	192 / 192
Fri, 20 Jan	85.3Moderate	37–128	28.3	192 / 192
Sat, 21 Jan	97Moderate	35–169	36.6	192 / 192
Sun, 22 Jan	93.7Moderate	30–167	31	192 / 192
Mon, 23 Jan	90.8Moderate	32–160	26.5	192 / 192
Tue, 24 Jan	73.5Moderate	26–134	21.2	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	78	77	77	77	77	77	78	78	78	78	78	78	78	78	78	78	78	80	81	82	82	80	80	80
Thu	79	79	79	79	79	79	80	80	80	80	80	80	80	80	81	81	81	83	87	88	87	85	83	83
Fri	83	83	84	84	85	85	86	86	86	86	86	86	86	86	85	85	85	85	86	86	85	86	87	87
Sat	89	90	91	93	95	96	96	96	97	97	97	98	98	98	98	98	98	101	104	104	100	99	99	98
Sun	98	97	97	97	96	95	95	95	94	94	93	93	93	93	93	93	93	93	92	92	91	91	91	91
Mon	91	91	91	92	92	93	93	93	93	93	93	93	92	92	91	91	90	90	90	89	89	87	86	85
Tue	84	82	81	79	77	75	74	72	71	69	68	68	68	68	68	68	69	73	76	78	77	75	73	72

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	126.9Unhealthy for Sensitive Groups	169	51.3	168 / 168
Hai Phong	114.7Unhealthy for Sensitive Groups	167	43.8	168 / 168
Ho Chi Minh City	112.4Unhealthy for Sensitive Groups	141	37.4	168 / 168
Can Tho	90.3Moderate	132	28.7	168 / 168
Da Nang	74.3Moderate	101	21.2	168 / 168
Hue	70.4Moderate	78	20.1	168 / 168
Nha Trang	60Moderate	69	14.4	168 / 168
Da Lat	36.8Good	46	5.2	168 / 168

City-hours by category

Good: 168

Moderate: 809

Unhealthy for Sensitive Groups: 260

Unhealthy: 107

Very Unhealthy: 0

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	78	77	77	77	77	77	78	78	78	78	78	78	78	78	78	78	78	80	81	82	82	80	80	80
Thu	79	79	79	79	79	79	80	80	80	80	80	80	80	80	81	81	81	83	87	88	87	85	83	83
Fri	83	83	84	84	85	85	86	86	86	86	86	86	86	86	85	85	85	85	86	86	85	86	87	87
Sat	89	90	91	93	95	96	96	96	97	97	97	98	98	98	98	98	98	101	104	104	100	99	99	98
Sun	98	97	97	97	96	95	95	95	94	94	93	93	93	93	93	93	93	93	92	92	91	91	91	91
Mon	91	91	91	92	92	93	93	93	93	93	93	93	92	92	91	91	90	90	90	89	89	87	86	85
Tue	84	82	81	79	77	75	74	72	71	69	68	68	68	68	68	68	69	73	76	78	77	75	73	72

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	78	77	77	77	77	77	78	78	78	78	78	78	78	78	78	78	78	80	81	82	82	80	80	80
Thu	79	79	79	79	79	79	80	80	80	80	80	80	80	80	81	81	81	83	87	88	87	85	83	83
Fri	83	83	84	84	85	85	86	86	86	86	86	86	86	86	85	85	85	85	86	86	85	86	87	87
Sat	89	90	91	93	95	96	96	96	97	97	97	98	98	98	98	98	98	101	104	104	100	99	99	98
Sun	98	97	97	97	96	95	95	95	94	94	93	93	93	93	93	93	93	93	92	92	91	91	91	91
Mon	91	91	91	92	92	93	93	93	93	93	93	93	92	92	91	91	90	90	90	89	89	87	86	85
Tue	84	82	81	79	77	75	74	72	71	69	68	68	68	68	68	68	69	73	76	78	77	75	73	72

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	78	77	77	77	77	77	78	78	78	78	78	78	78	78	78	78	78	80	81	82	82	80	80	80
Thu	79	79	79	79	79	79	80	80	80	80	80	80	80	80	81	81	81	83	87	88	87	85	83	83
Fri	83	83	84	84	85	85	86	86	86	86	86	86	86	86	85	85	85	85	86	86	85	86	87	87
Sat	89	90	91	93	95	96	96	96	97	97	97	98	98	98	98	98	98	101	104	104	100	99	99	98
Sun	98	97	97	97	96	95	95	95	94	94	93	93	93	93	93	93	93	93	92	92	91	91	91	91
Mon	91	91	91	92	92	93	93	93	93	93	93	93	92	92	91	91	90	90	90	89	89	87	86	85
Tue	84	82	81	79	77	75	74	72	71	69	68	68	68	68	68	68	69	73	76	78	77	75	73	72