17 – 23 May 2023 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

106.1Weekly mean modelled AQI · Unhealthy for Sensitive Groups

Mean PM2.5: 39.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+32.3 AQI compared with the previous week’s mean of 73.8.

Highest hourly estimate: 320 in Hai Phong · 19 May, 08:00 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, 17 May	96Moderate	58–182	33.9	192 / 192
Thu, 18 May	105.8Unhealthy for Sensitive Groups	56–272	49.7	192 / 192
Fri, 19 May	124.4Unhealthy for Sensitive Groups	55–320	57.1	192 / 192
Sat, 20 May	121.3Unhealthy for Sensitive Groups	56–303	43.2	192 / 192
Sun, 21 May	110.9Unhealthy for Sensitive Groups	58–208	32.3	192 / 192
Mon, 22 May	96.8Moderate	52–198	35	192 / 192
Tue, 23 May	87.4Moderate	39–197	24.9	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	88	89	89	89	90	90	90	90	90	90	90	90	91	91	92	96	105	111	116	116	112	106	100	95
Thu	94	94	95	94	94	94	95	95	95	95	96	96	97	99	100	109	120	129	134	135	130	123	116	111
Fri	111	112	114	115	117	119	120	121	121	121	121	121	120	119	119	123	130	138	143	145	143	139	131	123
Sat	119	118	118	118	117	116	116	116	117	118	118	118	118	118	119	123	127	133	135	134	131	127	121	116
Sun	112	111	110	110	110	109	109	109	108	107	107	106	105	104	102	108	113	120	124	124	122	118	112	104
Mon	95	91	90	90	89	89	89	88	88	88	88	87	87	88	89	97	105	113	119	120	117	113	107	100
Tue	94	92	92	92	92	91	91	90	90	89	89	88	88	87	86	84	83	83	82	83	85	84	83	82

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
Hai Phong	207Very Unhealthy	320	124.3	168 / 168
Hanoi	138.4Unhealthy for Sensitive Groups	213	47	168 / 168
Da Nang	132.9Unhealthy for Sensitive Groups	213	42.6	168 / 168
Hue	95.6Moderate	157	29.1	168 / 168
Ho Chi Minh City	85.9Moderate	113	27	168 / 168
Nha Trang	71.6Moderate	131	18.7	168 / 168
Can Tho	60.1Moderate	66	14	168 / 168
Da Lat	57.2Moderate	72	12.8	168 / 168

City-hours by category

Good: 21

Moderate: 813

Unhealthy for Sensitive Groups: 218

Unhealthy: 216

Very Unhealthy: 58

Hazardous: 18

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	88	89	89	89	90	90	90	90	90	90	90	90	91	91	92	96	105	111	116	116	112	106	100	95
Thu	94	94	95	94	94	94	95	95	95	95	96	96	97	99	100	109	120	129	134	135	130	123	116	111
Fri	111	112	114	115	117	119	120	121	121	121	121	121	120	119	119	123	130	138	143	145	143	139	131	123
Sat	119	118	118	118	117	116	116	116	117	118	118	118	118	118	119	123	127	133	135	134	131	127	121	116
Sun	112	111	110	110	110	109	109	109	108	107	107	106	105	104	102	108	113	120	124	124	122	118	112	104
Mon	95	91	90	90	89	89	89	88	88	88	88	87	87	88	89	97	105	113	119	120	117	113	107	100
Tue	94	92	92	92	92	91	91	90	90	89	89	88	88	87	86	84	83	83	82	83	85	84	83	82

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	88	89	89	89	90	90	90	90	90	90	90	90	91	91	92	96	105	111	116	116	112	106	100	95
Thu	94	94	95	94	94	94	95	95	95	95	96	96	97	99	100	109	120	129	134	135	130	123	116	111
Fri	111	112	114	115	117	119	120	121	121	121	121	121	120	119	119	123	130	138	143	145	143	139	131	123
Sat	119	118	118	118	117	116	116	116	117	118	118	118	118	118	119	123	127	133	135	134	131	127	121	116
Sun	112	111	110	110	110	109	109	109	108	107	107	106	105	104	102	108	113	120	124	124	122	118	112	104
Mon	95	91	90	90	89	89	89	88	88	88	88	87	87	88	89	97	105	113	119	120	117	113	107	100
Tue	94	92	92	92	92	91	91	90	90	89	89	88	88	87	86	84	83	83	82	83	85	84	83	82

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	88	89	89	89	90	90	90	90	90	90	90	90	91	91	92	96	105	111	116	116	112	106	100	95
Thu	94	94	95	94	94	94	95	95	95	95	96	96	97	99	100	109	120	129	134	135	130	123	116	111
Fri	111	112	114	115	117	119	120	121	121	121	121	121	120	119	119	123	130	138	143	145	143	139	131	123
Sat	119	118	118	118	117	116	116	116	117	118	118	118	118	118	119	123	127	133	135	134	131	127	121	116
Sun	112	111	110	110	110	109	109	109	108	107	107	106	105	104	102	108	113	120	124	124	122	118	112	104
Mon	95	91	90	90	89	89	89	88	88	88	88	87	87	88	89	97	105	113	119	120	117	113	107	100
Tue	94	92	92	92	92	91	91	90	90	89	89	88	88	87	86	84	83	83	82	83	85	84	83	82