4 – 10 Jan 2023 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

82.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 29.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

-4.4 AQI compared with the previous week’s mean of 87.3.

Highest hourly estimate: 200 in Hanoi · 10 Jan, 10:00 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, 4 Jan	79Moderate	38–142	24.8	192 / 192
Thu, 5 Jan	80.4Moderate	35–167	25.3	192 / 192
Fri, 6 Jan	75.6Moderate	37–167	19.3	192 / 192
Sat, 7 Jan	70.3Moderate	37–117	23.7	192 / 192
Sun, 8 Jan	92.6Moderate	20–186	40.1	192 / 192
Mon, 9 Jan	95.1Moderate	18–196	38.3	192 / 192
Tue, 10 Jan	86.9Moderate	18–200	34.5	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	72	72	74	75	76	77	78	78	79	79	79	80	80	80	80	81	81	82	82	82	83	83	83	83
Thu	83	82	82	81	80	80	80	80	79	80	79	80	80	80	80	81	81	81	81	81	81	80	80	80
Fri	80	80	79	79	79	78	78	77	77	77	76	76	76	75	75	75	74	74	73	72	72	72	71	71
Sat	71	71	70	70	70	69	70	70	70	70	70	69	69	69	69	69	69	69	70	70	71	73	75	77
Sun	79	82	85	87	89	90	91	92	93	94	94	95	95	96	96	96	96	96	96	97	96	96	96	96
Mon	95	95	95	95	95	95	96	96	96	97	97	97	96	96	96	96	96	95	95	94	93	93	92	92
Tue	91	91	90	90	89	89	88	88	87	87	86	86	86	86	86	86	86	86	86	86	85	85	84	84

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	152.6Unhealthy	200	78.6	168 / 168
Hai Phong	140.6Unhealthy for Sensitive Groups	197	66.4	168 / 168
Hue	75.6Moderate	116	21.8	168 / 168
Da Nang	73.8Moderate	91	20.8	168 / 168
Ho Chi Minh City	70.3Moderate	130	18.2	168 / 168
Can Tho	67Moderate	82	17.2	168 / 168
Nha Trang	49.9Good	56	9.6	168 / 168
Da Lat	33Good	42	2.9	168 / 168

City-hours by category

Good: 231

Moderate: 792

Unhealthy for Sensitive Groups: 154

Unhealthy: 167

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	72	72	74	75	76	77	78	78	79	79	79	80	80	80	80	81	81	82	82	82	83	83	83	83
Thu	83	82	82	81	80	80	80	80	79	80	79	80	80	80	80	81	81	81	81	81	81	80	80	80
Fri	80	80	79	79	79	78	78	77	77	77	76	76	76	75	75	75	74	74	73	72	72	72	71	71
Sat	71	71	70	70	70	69	70	70	70	70	70	69	69	69	69	69	69	69	70	70	71	73	75	77
Sun	79	82	85	87	89	90	91	92	93	94	94	95	95	96	96	96	96	96	96	97	96	96	96	96
Mon	95	95	95	95	95	95	96	96	96	97	97	97	96	96	96	96	96	95	95	94	93	93	92	92
Tue	91	91	90	90	89	89	88	88	87	87	86	86	86	86	86	86	86	86	86	86	85	85	84	84

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	72	72	74	75	76	77	78	78	79	79	79	80	80	80	80	81	81	82	82	82	83	83	83	83
Thu	83	82	82	81	80	80	80	80	79	80	79	80	80	80	80	81	81	81	81	81	81	80	80	80
Fri	80	80	79	79	79	78	78	77	77	77	76	76	76	75	75	75	74	74	73	72	72	72	71	71
Sat	71	71	70	70	70	69	70	70	70	70	70	69	69	69	69	69	69	69	70	70	71	73	75	77
Sun	79	82	85	87	89	90	91	92	93	94	94	95	95	96	96	96	96	96	96	97	96	96	96	96
Mon	95	95	95	95	95	95	96	96	96	97	97	97	96	96	96	96	96	95	95	94	93	93	92	92
Tue	91	91	90	90	89	89	88	88	87	87	86	86	86	86	86	86	86	86	86	86	85	85	84	84

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	72	72	74	75	76	77	78	78	79	79	79	80	80	80	80	81	81	82	82	82	83	83	83	83
Thu	83	82	82	81	80	80	80	80	79	80	79	80	80	80	80	81	81	81	81	81	81	80	80	80
Fri	80	80	79	79	79	78	78	77	77	77	76	76	76	75	75	75	74	74	73	72	72	72	71	71
Sat	71	71	70	70	70	69	70	70	70	70	70	69	69	69	69	69	69	69	70	70	71	73	75	77
Sun	79	82	85	87	89	90	91	92	93	94	94	95	95	96	96	96	96	96	96	97	96	96	96	96
Mon	95	95	95	95	95	95	96	96	96	97	97	97	96	96	96	96	96	95	95	94	93	93	92	92
Tue	91	91	90	90	89	89	88	88	87	87	86	86	86	86	86	86	86	86	86	86	85	85	84	84