31 Dec 2025 – 6 Jan 2026 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

74.8Weekly mean modelled AQI · Moderate

Mean PM2.5: 21.3 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

-3.4 AQI compared with the previous week’s mean of 78.2.

Highest hourly estimate: 145 in Hanoi · 31 Dec, 00:00 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, 31 Dec	76.3Moderate	40–145	20.4	192 / 192
Thu, 1 Jan	71.3Moderate	45–114	18.5	192 / 192
Fri, 2 Jan	68.6Moderate	46–90	20.4	192 / 192
Sat, 3 Jan	76.9Moderate	46–114	24.8	192 / 192
Sun, 4 Jan	81.7Moderate	37–142	24.5	192 / 192
Mon, 5 Jan	77.5Moderate	30–132	21	192 / 192
Tue, 6 Jan	71.1Moderate	31–122	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	78	77	77	77	76	76	76	75	75	75	74	74	74	74	73	74	74	79	85	86	82	77	74	72
Thu	72	71	71	71	71	70	70	70	70	69	69	69	69	69	69	70	71	77	80	79	77	73	69	68
Fri	68	68	68	68	67	67	67	67	67	67	68	67	68	68	68	69	69	70	71	72	71	71	71	72
Sat	72	73	73	73	74	75	75	76	76	76	76	77	77	77	78	78	78	79	81	82	81	80	80	80
Sun	81	81	81	81	82	82	82	83	83	83	82	83	82	82	81	81	81	82	84	85	82	80	80	80
Mon	80	79	79	79	79	78	78	78	78	77	77	77	78	77	78	78	78	78	78	77	77	75	74	73
Tue	72	72	71	70	70	69	69	68	68	67	68	68	69	70	71	73	74	75	75	75	74	73	72	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	98.8Moderate	145	32	168 / 168
Can Tho	97.4Moderate	131	31.8	168 / 168
Ho Chi Minh City	92.4Moderate	121	30.3	168 / 168
Hai Phong	77.3Moderate	89	23.1	168 / 168
Da Nang	67.7Moderate	103	16.4	168 / 168
Hue	66.7Moderate	93	18.1	168 / 168
Nha Trang	53.8Moderate	60	11.3	168 / 168
Da Lat	44.1Good	54	7.5	168 / 168

City-hours by category

Good: 183

Moderate: 972

Unhealthy for Sensitive Groups: 189

Unhealthy: 0

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	76	76	76	75	75	75	74	74	74	74	73	74	74	79	85	86	82	77	74	72
Thu	72	71	71	71	71	70	70	70	70	69	69	69	69	69	69	70	71	77	80	79	77	73	69	68
Fri	68	68	68	68	67	67	67	67	67	67	68	67	68	68	68	69	69	70	71	72	71	71	71	72
Sat	72	73	73	73	74	75	75	76	76	76	76	77	77	77	78	78	78	79	81	82	81	80	80	80
Sun	81	81	81	81	82	82	82	83	83	83	82	83	82	82	81	81	81	82	84	85	82	80	80	80
Mon	80	79	79	79	79	78	78	78	78	77	77	77	78	77	78	78	78	78	78	77	77	75	74	73
Tue	72	72	71	70	70	69	69	68	68	67	68	68	69	70	71	73	74	75	75	75	74	73	72	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	76	76	76	75	75	75	74	74	74	74	73	74	74	79	85	86	82	77	74	72
Thu	72	71	71	71	71	70	70	70	70	69	69	69	69	69	69	70	71	77	80	79	77	73	69	68
Fri	68	68	68	68	67	67	67	67	67	67	68	67	68	68	68	69	69	70	71	72	71	71	71	72
Sat	72	73	73	73	74	75	75	76	76	76	76	77	77	77	78	78	78	79	81	82	81	80	80	80
Sun	81	81	81	81	82	82	82	83	83	83	82	83	82	82	81	81	81	82	84	85	82	80	80	80
Mon	80	79	79	79	79	78	78	78	78	77	77	77	78	77	78	78	78	78	78	77	77	75	74	73
Tue	72	72	71	70	70	69	69	68	68	67	68	68	69	70	71	73	74	75	75	75	74	73	72	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	76	76	76	75	75	75	74	74	74	74	73	74	74	79	85	86	82	77	74	72
Thu	72	71	71	71	71	70	70	70	70	69	69	69	69	69	69	70	71	77	80	79	77	73	69	68
Fri	68	68	68	68	67	67	67	67	67	67	68	67	68	68	68	69	69	70	71	72	71	71	71	72
Sat	72	73	73	73	74	75	75	76	76	76	76	77	77	77	78	78	78	79	81	82	81	80	80	80
Sun	81	81	81	81	82	82	82	83	83	83	82	83	82	82	81	81	81	82	84	85	82	80	80	80
Mon	80	79	79	79	79	78	78	78	78	77	77	77	78	77	78	78	78	78	78	77	77	75	74	73
Tue	72	72	71	70	70	69	69	68	68	67	68	68	69	70	71	73	74	75	75	75	74	73	72	72