22 – 28 Mar 2023 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

90.1Weekly mean modelled AQI · Moderate

Mean PM2.5: 28.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+22.1 AQI compared with the previous week’s mean of 68.

Highest hourly estimate: 210 in Hanoi · 23 Mar, 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, 22 Mar	98Moderate	59–185	33.4	192 / 192
Thu, 23 Mar	98.6Moderate	58–210	32.1	192 / 192
Fri, 24 Mar	100Moderate	61–157	34.8	192 / 192
Sat, 25 Mar	98.8Moderate	64–185	30.5	192 / 192
Sun, 26 Mar	85.8Moderate	59–158	24.9	192 / 192
Mon, 27 Mar	77.3Moderate	55–131	21.3	192 / 192
Tue, 28 Mar	72Moderate	55–118	19.6	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	91	92	93	93	94	94	95	96	96	97	98	98	99	99	99	99	100	104	107	106	103	101	100	99
Thu	98	98	98	98	98	98	98	98	98	98	97	97	96	95	95	95	100	105	106	105	103	100	97	97
Fri	97	97	98	98	98	98	98	98	98	99	100	100	101	101	101	101	101	102	103	103	102	102	102	102
Sat	102	102	103	102	102	103	103	103	102	102	101	100	99	98	97	96	95	95	97	97	96	95	92	91
Sun	91	91	90	90	89	89	88	88	87	87	86	86	85	85	85	85	84	84	83	82	82	82	82	81
Mon	81	81	81	80	80	80	80	80	79	78	78	77	77	76	76	76	76	75	75	74	74	74	74	74
Tue	73	73	73	73	73	73	73	72	72	72	72	72	72	72	72	72	72	72	72	72	71	71	71	71

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
Hue	137.5Unhealthy for Sensitive Groups	185	48.3	168 / 168
Hanoi	124.7Unhealthy for Sensitive Groups	210	44.1	168 / 168
Hai Phong	103Unhealthy for Sensitive Groups	129	35.9	168 / 168
Da Nang	95.5Moderate	145	30.2	168 / 168
Da Lat	69.2Moderate	82	18.6	168 / 168
Ho Chi Minh City	64.5Moderate	74	16.3	168 / 168
Can Tho	63.3Moderate	77	15.7	168 / 168
Nha Trang	62.9Moderate	70	15.5	168 / 168

City-hours by category

Good: 0

Moderate: 932

Unhealthy for Sensitive Groups: 299

Unhealthy: 109

Very Unhealthy: 4

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	91	92	93	93	94	94	95	96	96	97	98	98	99	99	99	99	100	104	107	106	103	101	100	99
Thu	98	98	98	98	98	98	98	98	98	98	97	97	96	95	95	95	100	105	106	105	103	100	97	97
Fri	97	97	98	98	98	98	98	98	98	99	100	100	101	101	101	101	101	102	103	103	102	102	102	102
Sat	102	102	103	102	102	103	103	103	102	102	101	100	99	98	97	96	95	95	97	97	96	95	92	91
Sun	91	91	90	90	89	89	88	88	87	87	86	86	85	85	85	85	84	84	83	82	82	82	82	81
Mon	81	81	81	80	80	80	80	80	79	78	78	77	77	76	76	76	76	75	75	74	74	74	74	74
Tue	73	73	73	73	73	73	73	72	72	72	72	72	72	72	72	72	72	72	72	72	71	71	71	71

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	91	92	93	93	94	94	95	96	96	97	98	98	99	99	99	99	100	104	107	106	103	101	100	99
Thu	98	98	98	98	98	98	98	98	98	98	97	97	96	95	95	95	100	105	106	105	103	100	97	97
Fri	97	97	98	98	98	98	98	98	98	99	100	100	101	101	101	101	101	102	103	103	102	102	102	102
Sat	102	102	103	102	102	103	103	103	102	102	101	100	99	98	97	96	95	95	97	97	96	95	92	91
Sun	91	91	90	90	89	89	88	88	87	87	86	86	85	85	85	85	84	84	83	82	82	82	82	81
Mon	81	81	81	80	80	80	80	80	79	78	78	77	77	76	76	76	76	75	75	74	74	74	74	74
Tue	73	73	73	73	73	73	73	72	72	72	72	72	72	72	72	72	72	72	72	72	71	71	71	71

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	91	92	93	93	94	94	95	96	96	97	98	98	99	99	99	99	100	104	107	106	103	101	100	99
Thu	98	98	98	98	98	98	98	98	98	98	97	97	96	95	95	95	100	105	106	105	103	100	97	97
Fri	97	97	98	98	98	98	98	98	98	99	100	100	101	101	101	101	101	102	103	103	102	102	102	102
Sat	102	102	103	102	102	103	103	103	102	102	101	100	99	98	97	96	95	95	97	97	96	95	92	91
Sun	91	91	90	90	89	89	88	88	87	87	86	86	85	85	85	85	84	84	83	82	82	82	82	81
Mon	81	81	81	80	80	80	80	80	79	78	78	77	77	76	76	76	76	75	75	74	74	74	74	74
Tue	73	73	73	73	73	73	73	72	72	72	72	72	72	72	72	72	72	72	72	72	71	71	71	71