28 Sep – 4 Oct 2022 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

62.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 15.6 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

-11.3 AQI compared with the previous week’s mean of 73.6.

Highest hourly estimate: 170 in Hai Phong · 28 Sept, 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, 28 Sep	71.9Moderate	16–170	14.5	192 / 192
Thu, 29 Sep	51.4Moderate	17–119	11.4	192 / 192
Fri, 30 Sep	53.5Moderate	17–87	14.5	192 / 192
Sat, 1 Oct	64.6Moderate	25–90	19	192 / 192
Sun, 2 Oct	69.8Moderate	45–116	19.5	192 / 192
Mon, 3 Oct	64.5Moderate	42–106	14.4	192 / 192
Tue, 4 Oct	60.6Moderate	28–99	15.7	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	86	83	81	79	78	78	77	76	75	74	74	73	72	72	71	70	69	68	67	65	63	60	58	57
Thu	56	55	54	53	52	51	51	50	50	50	50	50	50	50	50	50	51	51	52	52	51	51	51	51
Fri	51	51	51	52	52	52	52	52	52	52	53	53	53	53	53	53	55	56	57	56	56	56	57	57
Sat	58	59	60	61	61	62	63	64	64	65	65	65	65	66	66	66	67	67	67	68	68	68	68	68
Sun	68	69	69	69	70	70	70	69	70	70	70	70	70	70	70	70	70	70	70	71	71	70	70	70
Mon	70	69	69	68	68	67	67	66	66	65	65	65	65	64	64	63	63	62	62	62	61	61	60	60
Tue	59	59	60	60	60	61	61	61	62	61	62	61	61	61	61	61	61	61	61	60	61	61	60	60

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	90.7Moderate	157	28.1	168 / 168
Hai Phong	80.7Moderate	170	21.1	168 / 168
Ho Chi Minh City	72Moderate	116	20.5	168 / 168
Hue	60.5Moderate	102	13.8	168 / 168
Da Nang	57.9Moderate	87	12.3	168 / 168
Can Tho	53.9Moderate	78	12.8	168 / 168
Nha Trang	50.2Moderate	65	9.9	168 / 168
Da Lat	32.8Good	54	6	168 / 168

City-hours by category

Good: 324

Moderate: 946

Unhealthy for Sensitive Groups: 55

Unhealthy: 19

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	86	83	81	79	78	78	77	76	75	74	74	73	72	72	71	70	69	68	67	65	63	60	58	57
Thu	56	55	54	53	52	51	51	50	50	50	50	50	50	50	50	50	51	51	52	52	51	51	51	51
Fri	51	51	51	52	52	52	52	52	52	52	53	53	53	53	53	53	55	56	57	56	56	56	57	57
Sat	58	59	60	61	61	62	63	64	64	65	65	65	65	66	66	66	67	67	67	68	68	68	68	68
Sun	68	69	69	69	70	70	70	69	70	70	70	70	70	70	70	70	70	70	70	71	71	70	70	70
Mon	70	69	69	68	68	67	67	66	66	65	65	65	65	64	64	63	63	62	62	62	61	61	60	60
Tue	59	59	60	60	60	61	61	61	62	61	62	61	61	61	61	61	61	61	61	60	61	61	60	60

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	86	83	81	79	78	78	77	76	75	74	74	73	72	72	71	70	69	68	67	65	63	60	58	57
Thu	56	55	54	53	52	51	51	50	50	50	50	50	50	50	50	50	51	51	52	52	51	51	51	51
Fri	51	51	51	52	52	52	52	52	52	52	53	53	53	53	53	53	55	56	57	56	56	56	57	57
Sat	58	59	60	61	61	62	63	64	64	65	65	65	65	66	66	66	67	67	67	68	68	68	68	68
Sun	68	69	69	69	70	70	70	69	70	70	70	70	70	70	70	70	70	70	70	71	71	70	70	70
Mon	70	69	69	68	68	67	67	66	66	65	65	65	65	64	64	63	63	62	62	62	61	61	60	60
Tue	59	59	60	60	60	61	61	61	62	61	62	61	61	61	61	61	61	61	61	60	61	61	60	60

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	86	83	81	79	78	78	77	76	75	74	74	73	72	72	71	70	69	68	67	65	63	60	58	57
Thu	56	55	54	53	52	51	51	50	50	50	50	50	50	50	50	50	51	51	52	52	51	51	51	51
Fri	51	51	51	52	52	52	52	52	52	52	53	53	53	53	53	53	55	56	57	56	56	56	57	57
Sat	58	59	60	61	61	62	63	64	64	65	65	65	65	66	66	66	67	67	67	68	68	68	68	68
Sun	68	69	69	69	70	70	70	69	70	70	70	70	70	70	70	70	70	70	70	71	71	70	70	70
Mon	70	69	69	68	68	67	67	66	66	65	65	65	65	64	64	63	63	62	62	62	61	61	60	60
Tue	59	59	60	60	60	61	61	61	62	61	62	61	61	61	61	61	61	61	61	60	61	61	60	60