16 – 22 Sep 2026 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

77.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 24.2 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+7.8 AQI compared with the previous week’s mean of 70.1.

Highest hourly estimate: 220 in Hanoi · 21 Sept, 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, 16 Sep	94.5Moderate	54–164	31.7	192 / 192
Thu, 17 Sep	85.9Moderate	53–162	22.3	192 / 192
Fri, 18 Sep	74.9Moderate	38–155	19.6	192 / 192
Sat, 19 Sep	73.1Moderate	30–167	23.2	192 / 192
Sun, 20 Sep	72.2Moderate	19–204	21	192 / 192
Mon, 21 Sep	70Moderate	14–220	25.4	192 / 192
Tue, 22 Sep	74.5Moderate	13–215	26.4	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	92	92	93	93	94	94	94	94	94	95	95	95	95	94	94	94	94	96	98	98	97	96	94	94
Thu	94	93	92	91	91	90	89	88	87	86	85	85	84	83	82	82	83	84	85	84	83	82	81	81
Fri	80	78	77	77	77	77	77	76	76	76	75	75	74	74	73	74	75	75	75	73	72	71	71	70
Sat	70	70	70	70	70	70	70	71	72	72	73	73	73	73	73	73	75	77	78	78	77	77	76	75
Sun	74	74	75	75	75	75	75	75	74	72	72	71	70	70	69	69	74	77	76	74	70	67	66	66
Mon	65	65	65	65	64	65	65	65	65	65	65	65	66	67	68	73	80	84	85	83	80	75	72	72
Tue	71	71	71	71	71	71	71	71	71	72	71	72	72	73	74	77	82	85	86	83	80	75	73	73

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	149.7Unhealthy for Sensitive Groups	220	70.5	168 / 168
Ho Chi Minh City	104.2Unhealthy for Sensitive Groups	163	35.4	168 / 168
Hai Phong	88.6Moderate	183	27.9	168 / 168
Can Tho	78.7Moderate	164	20.4	168 / 168
Hue	61.5Moderate	92	13.9	168 / 168
Nha Trang	51.3Moderate	113	9.4	168 / 168
Da Nang	47.2Good	80	8.9	168 / 168
Da Lat	41.6Good	60	7.4	168 / 168

City-hours by category

Good: 292

Moderate: 762

Unhealthy for Sensitive Groups: 106

Unhealthy: 172

Very Unhealthy: 12

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	92	92	93	93	94	94	94	94	94	95	95	95	95	94	94	94	94	96	98	98	97	96	94	94
Thu	94	93	92	91	91	90	89	88	87	86	85	85	84	83	82	82	83	84	85	84	83	82	81	81
Fri	80	78	77	77	77	77	77	76	76	76	75	75	74	74	73	74	75	75	75	73	72	71	71	70
Sat	70	70	70	70	70	70	70	71	72	72	73	73	73	73	73	73	75	77	78	78	77	77	76	75
Sun	74	74	75	75	75	75	75	75	74	72	72	71	70	70	69	69	74	77	76	74	70	67	66	66
Mon	65	65	65	65	64	65	65	65	65	65	65	65	66	67	68	73	80	84	85	83	80	75	72	72
Tue	71	71	71	71	71	71	71	71	71	72	71	72	72	73	74	77	82	85	86	83	80	75	73	73

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	92	92	93	93	94	94	94	94	94	95	95	95	95	94	94	94	94	96	98	98	97	96	94	94
Thu	94	93	92	91	91	90	89	88	87	86	85	85	84	83	82	82	83	84	85	84	83	82	81	81
Fri	80	78	77	77	77	77	77	76	76	76	75	75	74	74	73	74	75	75	75	73	72	71	71	70
Sat	70	70	70	70	70	70	70	71	72	72	73	73	73	73	73	73	75	77	78	78	77	77	76	75
Sun	74	74	75	75	75	75	75	75	74	72	72	71	70	70	69	69	74	77	76	74	70	67	66	66
Mon	65	65	65	65	64	65	65	65	65	65	65	65	66	67	68	73	80	84	85	83	80	75	72	72
Tue	71	71	71	71	71	71	71	71	71	72	71	72	72	73	74	77	82	85	86	83	80	75	73	73

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	92	92	93	93	94	94	94	94	94	95	95	95	95	94	94	94	94	96	98	98	97	96	94	94
Thu	94	93	92	91	91	90	89	88	87	86	85	85	84	83	82	82	83	84	85	84	83	82	81	81
Fri	80	78	77	77	77	77	77	76	76	76	75	75	74	74	73	74	75	75	75	73	72	71	71	70
Sat	70	70	70	70	70	70	70	71	72	72	73	73	73	73	73	73	75	77	78	78	77	77	76	75
Sun	74	74	75	75	75	75	75	75	74	72	72	71	70	70	69	69	74	77	76	74	70	67	66	66
Mon	65	65	65	65	64	65	65	65	65	65	65	65	66	67	68	73	80	84	85	83	80	75	72	72
Tue	71	71	71	71	71	71	71	71	71	72	71	72	72	73	74	77	82	85	86	83	80	75	73	73