24 – 30 May 2023 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

76.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 21.5 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

-29.2 AQI compared with the previous week’s mean of 106.1.

Highest hourly estimate: 181 in Hanoi · 25 May, 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, 24 May	88.4Moderate	45–161	27.7	192 / 192
Thu, 25 May	87.7Moderate	55–181	25.1	192 / 192
Fri, 26 May	78.2Moderate	52–110	20.7	192 / 192
Sat, 27 May	72.1Moderate	50–98	19.2	192 / 192
Sun, 28 May	67.9Moderate	43–104	18.6	192 / 192
Mon, 29 May	71Moderate	43–142	19.8	192 / 192
Tue, 30 May	72.8Moderate	47–161	19.5	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	82	82	83	83	83	84	84	85	86	87	87	88	88	89	89	93	96	97	98	97	95	92	89	87
Thu	87	86	86	85	85	84	83	83	83	83	83	83	83	83	84	84	90	98	102	103	100	95	89	82
Fri	81	81	80	80	80	79	79	79	78	78	78	77	76	76	75	74	76	81	83	82	79	77	76	74
Sat	72	72	72	72	72	72	72	72	71	71	71	71	71	71	71	71	71	73	76	76	75	73	72	71
Sun	70	69	69	69	68	68	68	68	68	68	68	68	67	67	67	67	67	67	68	68	68	68	68	68
Mon	68	68	68	68	68	68	69	69	70	70	70	70	70	71	71	71	72	75	77	77	77	76	74	71
Tue	71	71	71	71	71	71	70	70	70	70	69	69	69	69	69	69	70	76	81	83	84	82	80	75

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	111.1Unhealthy for Sensitive Groups	147	39	168 / 168
Hanoi	98.3Moderate	181	29.8	168 / 168
Ho Chi Minh City	85.5Moderate	96	27.3	168 / 168
Nha Trang	74.2Moderate	113	19.5	168 / 168
Da Nang	72.8Moderate	161	17.6	168 / 168
Hue	64.7Moderate	95	16.2	168 / 168
Can Tho	56.6Moderate	61	12.4	168 / 168
Da Lat	51.9Moderate	58	10.3	168 / 168

City-hours by category

Good: 78

Moderate: 1065

Unhealthy for Sensitive Groups: 190

Unhealthy: 11

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	82	82	83	83	83	84	84	85	86	87	87	88	88	89	89	93	96	97	98	97	95	92	89	87
Thu	87	86	86	85	85	84	83	83	83	83	83	83	83	83	84	84	90	98	102	103	100	95	89	82
Fri	81	81	80	80	80	79	79	79	78	78	78	77	76	76	75	74	76	81	83	82	79	77	76	74
Sat	72	72	72	72	72	72	72	72	71	71	71	71	71	71	71	71	71	73	76	76	75	73	72	71
Sun	70	69	69	69	68	68	68	68	68	68	68	68	67	67	67	67	67	67	68	68	68	68	68	68
Mon	68	68	68	68	68	68	69	69	70	70	70	70	70	71	71	71	72	75	77	77	77	76	74	71
Tue	71	71	71	71	71	71	70	70	70	70	69	69	69	69	69	69	70	76	81	83	84	82	80	75

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	82	82	83	83	83	84	84	85	86	87	87	88	88	89	89	93	96	97	98	97	95	92	89	87
Thu	87	86	86	85	85	84	83	83	83	83	83	83	83	83	84	84	90	98	102	103	100	95	89	82
Fri	81	81	80	80	80	79	79	79	78	78	78	77	76	76	75	74	76	81	83	82	79	77	76	74
Sat	72	72	72	72	72	72	72	72	71	71	71	71	71	71	71	71	71	73	76	76	75	73	72	71
Sun	70	69	69	69	68	68	68	68	68	68	68	68	67	67	67	67	67	67	68	68	68	68	68	68
Mon	68	68	68	68	68	68	69	69	70	70	70	70	70	71	71	71	72	75	77	77	77	76	74	71
Tue	71	71	71	71	71	71	70	70	70	70	69	69	69	69	69	69	70	76	81	83	84	82	80	75

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	82	82	83	83	83	84	84	85	86	87	87	88	88	89	89	93	96	97	98	97	95	92	89	87
Thu	87	86	86	85	85	84	83	83	83	83	83	83	83	83	84	84	90	98	102	103	100	95	89	82
Fri	81	81	80	80	80	79	79	79	78	78	78	77	76	76	75	74	76	81	83	82	79	77	76	74
Sat	72	72	72	72	72	72	72	72	71	71	71	71	71	71	71	71	71	73	76	76	75	73	72	71
Sun	70	69	69	69	68	68	68	68	68	68	68	68	67	67	67	67	67	67	68	68	68	68	68	68
Mon	68	68	68	68	68	68	69	69	70	70	70	70	70	71	71	71	72	75	77	77	77	76	74	71
Tue	71	71	71	71	71	71	70	70	70	70	69	69	69	69	69	69	70	76	81	83	84	82	80	75