15 – 21 Feb 2023 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

80.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 25.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+10.7 AQI compared with the previous week’s mean of 70.2.

Highest hourly estimate: 176 in Hanoi · 17 Feb, 14:00 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, 15 Feb	72.1Moderate	41–102	20.2	192 / 192
Thu, 16 Feb	78.9Moderate	43–153	27	192 / 192
Fri, 17 Feb	85.9Moderate	37–176	26.4	192 / 192
Sat, 18 Feb	74.3Moderate	32–167	20.6	192 / 192
Sun, 19 Feb	73.5Moderate	28–123	23.1	192 / 192
Mon, 20 Feb	81.4Moderate	37–147	26.7	192 / 192
Tue, 21 Feb	100.4Unhealthy for Sensitive Groups	43–173	33.8	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	77	76	76	75	74	73	73	72	71	70	69	69	69	69	68	68	69	70	72	74	74	74	74	73
Thu	72	72	73	73	74	75	75	75	76	77	78	79	79	80	81	81	83	84	85	86	85	85	85	85
Fri	85	85	86	86	86	86	87	87	87	87	87	87	87	86	86	86	87	88	88	87	84	82	82	81
Sat	80	80	79	79	78	78	77	76	76	75	74	73	72	72	72	72	72	72	72	72	71	71	71	71
Sun	71	71	71	71	71	71	71	72	72	72	72	73	73	73	74	75	76	77	77	78	77	77	76	76
Mon	76	76	76	76	76	76	76	76	76	77	77	77	77	77	78	79	80	85	91	95	96	96	94	93
Tue	93	93	93	93	94	95	96	98	98	99	100	102	103	104	104	105	107	109	111	109	104	102	100	99

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	128.9Unhealthy for Sensitive Groups	176	54.3	168 / 168
Hai Phong	110.7Unhealthy for Sensitive Groups	173	40	168 / 168
Ho Chi Minh City	83Moderate	147	26.8	168 / 168
Da Nang	80.2Moderate	130	22.4	168 / 168
Hue	72.6Moderate	108	20.1	168 / 168
Can Tho	70.6Moderate	99	19.9	168 / 168
Nha Trang	58.9Moderate	81	13.6	168 / 168
Da Lat	42.6Good	64	6.1	168 / 168

City-hours by category

Good: 148

Moderate: 938

Unhealthy for Sensitive Groups: 195

Unhealthy: 63

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	77	76	76	75	74	73	73	72	71	70	69	69	69	69	68	68	69	70	72	74	74	74	74	73
Thu	72	72	73	73	74	75	75	75	76	77	78	79	79	80	81	81	83	84	85	86	85	85	85	85
Fri	85	85	86	86	86	86	87	87	87	87	87	87	87	86	86	86	87	88	88	87	84	82	82	81
Sat	80	80	79	79	78	78	77	76	76	75	74	73	72	72	72	72	72	72	72	72	71	71	71	71
Sun	71	71	71	71	71	71	71	72	72	72	72	73	73	73	74	75	76	77	77	78	77	77	76	76
Mon	76	76	76	76	76	76	76	76	76	77	77	77	77	77	78	79	80	85	91	95	96	96	94	93
Tue	93	93	93	93	94	95	96	98	98	99	100	102	103	104	104	105	107	109	111	109	104	102	100	99

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	77	76	76	75	74	73	73	72	71	70	69	69	69	69	68	68	69	70	72	74	74	74	74	73
Thu	72	72	73	73	74	75	75	75	76	77	78	79	79	80	81	81	83	84	85	86	85	85	85	85
Fri	85	85	86	86	86	86	87	87	87	87	87	87	87	86	86	86	87	88	88	87	84	82	82	81
Sat	80	80	79	79	78	78	77	76	76	75	74	73	72	72	72	72	72	72	72	72	71	71	71	71
Sun	71	71	71	71	71	71	71	72	72	72	72	73	73	73	74	75	76	77	77	78	77	77	76	76
Mon	76	76	76	76	76	76	76	76	76	77	77	77	77	77	78	79	80	85	91	95	96	96	94	93
Tue	93	93	93	93	94	95	96	98	98	99	100	102	103	104	104	105	107	109	111	109	104	102	100	99

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	77	76	76	75	74	73	73	72	71	70	69	69	69	69	68	68	69	70	72	74	74	74	74	73
Thu	72	72	73	73	74	75	75	75	76	77	78	79	79	80	81	81	83	84	85	86	85	85	85	85
Fri	85	85	86	86	86	86	87	87	87	87	87	87	87	86	86	86	87	88	88	87	84	82	82	81
Sat	80	80	79	79	78	78	77	76	76	75	74	73	72	72	72	72	72	72	72	72	71	71	71	71
Sun	71	71	71	71	71	71	71	72	72	72	72	73	73	73	74	75	76	77	77	78	77	77	76	76
Mon	76	76	76	76	76	76	76	76	76	77	77	77	77	77	78	79	80	85	91	95	96	96	94	93
Tue	93	93	93	93	94	95	96	98	98	99	100	102	103	104	104	105	107	109	111	109	104	102	100	99