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

Vietnam weekly air quality

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

92.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 31.8 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+35 AQI compared with the previous week’s mean of 57.3.

Highest hourly estimate: 201 in Hanoi · 23 Dec, 13:00 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 Dec	87.3Moderate	28–158	29.8	192 / 192
Thu, 22 Dec	96.9Moderate	31–176	41.7	192 / 192
Fri, 23 Dec	109.4Unhealthy for Sensitive Groups	35–201	38.4	192 / 192
Sat, 24 Dec	89.2Moderate	40–187	31	192 / 192
Sun, 25 Dec	94.7Moderate	41–159	28.8	192 / 192
Mon, 26 Dec	87Moderate	37–150	27.6	192 / 192
Tue, 27 Dec	81.7Moderate	34–126	25.4	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	83	84	84	85	86	87	87	88	87	87	87	87	87	88	88	88	88	88	89	88	89	90	91	91
Thu	91	91	92	92	92	92	93	93	95	95	96	97	97	98	98	99	100	100	102	102	102	102	103	104
Fri	105	106	106	107	109	110	111	111	112	112	113	113	113	113	112	112	111	111	111	109	108	106	105	103
Sat	101	98	96	95	93	92	90	89	87	87	86	85	85	85	85	86	86	86	87	87	88	89	90	91
Sun	92	94	95	95	96	97	97	98	98	97	97	97	97	96	96	95	95	94	93	93	92	92	91	90
Mon	90	89	88	88	87	87	86	86	86	86	86	86	86	86	86	87	87	87	88	88	88	88	87	87
Tue	86	85	84	84	83	82	81	80	80	80	80	79	79	79	79	79	79	80	82	83	84	84	84	84

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	149Unhealthy for Sensitive Groups	201	63.1	168 / 168
Ho Chi Minh City	118.3Unhealthy for Sensitive Groups	152	42.7	168 / 168
Hai Phong	115.3Unhealthy for Sensitive Groups	180	45.3	168 / 168
Can Tho	102.1Unhealthy for Sensitive Groups	128	36.3	168 / 168
Hue	80.2Moderate	123	24.4	168 / 168
Da Nang	73.8Moderate	92	21.6	168 / 168
Nha Trang	60.3Moderate	70	14.6	168 / 168
Da Lat	39.6Good	50	6.7	168 / 168

City-hours by category

Good: 168

Moderate: 683

Unhealthy for Sensitive Groups: 322

Unhealthy: 168

Very Unhealthy: 3

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	83	84	84	85	86	87	87	88	87	87	87	87	87	88	88	88	88	88	89	88	89	90	91	91
Thu	91	91	92	92	92	92	93	93	95	95	96	97	97	98	98	99	100	100	102	102	102	102	103	104
Fri	105	106	106	107	109	110	111	111	112	112	113	113	113	113	112	112	111	111	111	109	108	106	105	103
Sat	101	98	96	95	93	92	90	89	87	87	86	85	85	85	85	86	86	86	87	87	88	89	90	91
Sun	92	94	95	95	96	97	97	98	98	97	97	97	97	96	96	95	95	94	93	93	92	92	91	90
Mon	90	89	88	88	87	87	86	86	86	86	86	86	86	86	86	87	87	87	88	88	88	88	87	87
Tue	86	85	84	84	83	82	81	80	80	80	80	79	79	79	79	79	79	80	82	83	84	84	84	84

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	83	84	84	85	86	87	87	88	87	87	87	87	87	88	88	88	88	88	89	88	89	90	91	91
Thu	91	91	92	92	92	92	93	93	95	95	96	97	97	98	98	99	100	100	102	102	102	102	103	104
Fri	105	106	106	107	109	110	111	111	112	112	113	113	113	113	112	112	111	111	111	109	108	106	105	103
Sat	101	98	96	95	93	92	90	89	87	87	86	85	85	85	85	86	86	86	87	87	88	89	90	91
Sun	92	94	95	95	96	97	97	98	98	97	97	97	97	96	96	95	95	94	93	93	92	92	91	90
Mon	90	89	88	88	87	87	86	86	86	86	86	86	86	86	86	87	87	87	88	88	88	88	87	87
Tue	86	85	84	84	83	82	81	80	80	80	80	79	79	79	79	79	79	80	82	83	84	84	84	84

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	83	84	84	85	86	87	87	88	87	87	87	87	87	88	88	88	88	88	89	88	89	90	91	91
Thu	91	91	92	92	92	92	93	93	95	95	96	97	97	98	98	99	100	100	102	102	102	102	103	104
Fri	105	106	106	107	109	110	111	111	112	112	113	113	113	113	112	112	111	111	111	109	108	106	105	103
Sat	101	98	96	95	93	92	90	89	87	87	86	85	85	85	85	86	86	86	87	87	88	89	90	91
Sun	92	94	95	95	96	97	97	98	98	97	97	97	97	96	96	95	95	94	93	93	92	92	91	90
Mon	90	89	88	88	87	87	86	86	86	86	86	86	86	86	86	87	87	87	88	88	88	88	87	87
Tue	86	85	84	84	83	82	81	80	80	80	80	79	79	79	79	79	79	80	82	83	84	84	84	84