21 – 27 Sep 2022 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

73.6Weekly mean modelled AQI · Moderate

Mean PM2.5: 22.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

-3.2 AQI compared with the previous week’s mean of 76.8.

Highest hourly estimate: 171 in Hai Phong · 27 Sept, 22:00 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, 21 Sep	70.8Moderate	26–125	18.2	192 / 192
Thu, 22 Sep	60.6Moderate	28–105	15.6	192 / 192
Fri, 23 Sep	66Moderate	30–112	19.4	192 / 192
Sat, 24 Sep	73.3Moderate	34–141	23.6	192 / 192
Sun, 25 Sep	78.3Moderate	45–163	22.2	192 / 192
Mon, 26 Sep	80.6Moderate	28–156	26.8	192 / 192
Tue, 27 Sep	85.6Moderate	17–171	28.7	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	69	70	71	72	72	72	73	73	72	72	73	73	73	72	72	72	71	71	70	69	69	68	67	67
Thu	66	65	64	63	63	62	61	61	60	60	60	60	60	59	59	59	59	59	59	59	59	59	60	60
Fri	61	61	62	63	63	64	65	65	65	66	66	67	67	68	67	68	68	68	68	68	69	69	69	69
Sat	68	68	68	68	68	68	69	69	70	70	71	71	72	73	73	74	76	78	79	80	81	82	82	82
Sun	81	80	79	79	79	79	79	79	79	78	79	78	78	78	77	77	76	78	81	81	78	77	76	76
Mon	76	77	78	79	80	80	81	81	81	81	81	81	81	81	81	82	81	82	81	81	81	82	82	82
Tue	82	82	83	83	82	82	82	82	82	82	82	83	85	86	87	88	88	90	90	91	91	91	91	89

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	124.9Unhealthy for Sensitive Groups	164	47.9	168 / 168
Hai Phong	115.3Unhealthy for Sensitive Groups	171	45	168 / 168
Ho Chi Minh City	80.1Moderate	91	24.6	168 / 168
Hue	63.3Moderate	105	15.9	168 / 168
Can Tho	58.3Moderate	69	13.3	168 / 168
Da Nang	57.8Moderate	105	12.5	168 / 168
Nha Trang	54.2Moderate	59	11.3	168 / 168
Da Lat	34.8Good	51	6.1	168 / 168

City-hours by category

Good: 205

Moderate: 898

Unhealthy for Sensitive Groups: 171

Unhealthy: 70

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	69	70	71	72	72	72	73	73	72	72	73	73	73	72	72	72	71	71	70	69	69	68	67	67
Thu	66	65	64	63	63	62	61	61	60	60	60	60	60	59	59	59	59	59	59	59	59	59	60	60
Fri	61	61	62	63	63	64	65	65	65	66	66	67	67	68	67	68	68	68	68	68	69	69	69	69
Sat	68	68	68	68	68	68	69	69	70	70	71	71	72	73	73	74	76	78	79	80	81	82	82	82
Sun	81	80	79	79	79	79	79	79	79	78	79	78	78	78	77	77	76	78	81	81	78	77	76	76
Mon	76	77	78	79	80	80	81	81	81	81	81	81	81	81	81	82	81	82	81	81	81	82	82	82
Tue	82	82	83	83	82	82	82	82	82	82	82	83	85	86	87	88	88	90	90	91	91	91	91	89

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	69	70	71	72	72	72	73	73	72	72	73	73	73	72	72	72	71	71	70	69	69	68	67	67
Thu	66	65	64	63	63	62	61	61	60	60	60	60	60	59	59	59	59	59	59	59	59	59	60	60
Fri	61	61	62	63	63	64	65	65	65	66	66	67	67	68	67	68	68	68	68	68	69	69	69	69
Sat	68	68	68	68	68	68	69	69	70	70	71	71	72	73	73	74	76	78	79	80	81	82	82	82
Sun	81	80	79	79	79	79	79	79	79	78	79	78	78	78	77	77	76	78	81	81	78	77	76	76
Mon	76	77	78	79	80	80	81	81	81	81	81	81	81	81	81	82	81	82	81	81	81	82	82	82
Tue	82	82	83	83	82	82	82	82	82	82	82	83	85	86	87	88	88	90	90	91	91	91	91	89

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	69	70	71	72	72	72	73	73	72	72	73	73	73	72	72	72	71	71	70	69	69	68	67	67
Thu	66	65	64	63	63	62	61	61	60	60	60	60	60	59	59	59	59	59	59	59	59	59	60	60
Fri	61	61	62	63	63	64	65	65	65	66	66	67	67	68	67	68	68	68	68	68	69	69	69	69
Sat	68	68	68	68	68	68	69	69	70	70	71	71	72	73	73	74	76	78	79	80	81	82	82	82
Sun	81	80	79	79	79	79	79	79	79	78	79	78	78	78	77	77	76	78	81	81	78	77	76	76
Mon	76	77	78	79	80	80	81	81	81	81	81	81	81	81	81	82	81	82	81	81	81	82	82	82
Tue	82	82	83	83	82	82	82	82	82	82	82	83	85	86	87	88	88	90	90	91	91	91	91	89