12 – 18 Apr 2023 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

113Weekly mean modelled AQI · Unhealthy for Sensitive Groups

Mean PM2.5: 40.7 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+23.7 AQI compared with the previous week’s mean of 89.3.

Highest hourly estimate: 200 in Hanoi · 18 Apr, 19:00 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, 12 Apr	108.9Unhealthy for Sensitive Groups	72–158	42.8	192 / 192
Thu, 13 Apr	111.5Unhealthy for Sensitive Groups	85–154	35	192 / 192
Fri, 14 Apr	103.6Unhealthy for Sensitive Groups	86–135	40.9	192 / 192
Sat, 15 Apr	120.2Unhealthy for Sensitive Groups	91–153	45	192 / 192
Sun, 16 Apr	119.8Unhealthy for Sensitive Groups	67–187	45.5	192 / 192
Mon, 17 Apr	115.7Unhealthy for Sensitive Groups	66–175	40.7	192 / 192
Tue, 18 Apr	111.1Unhealthy for Sensitive Groups	65–200	35.2	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	102	102	102	102	102	102	103	103	103	104	106	106	108	110	111	112	114	115	117	118	118	119	119	119
Thu	119	119	119	119	119	119	119	119	117	116	115	114	113	111	110	108	107	105	104	102	102	101	101	100
Fri	100	100	100	99	99	99	99	99	100	100	101	102	102	103	104	105	106	107	108	109	110	111	112	113
Sat	114	115	116	116	118	119	120	121	122	122	122	122	123	122	122	122	122	121	121	121	121	121	121	122
Sun	123	123	124	124	124	124	123	123	122	121	120	120	119	119	118	117	117	117	118	118	117	116	115	115
Mon	115	115	114	114	114	114	114	114	114	115	115	116	116	116	117	117	118	118	118	118	118	117	116	115
Tue	115	114	113	112	112	112	111	111	111	110	109	109	108	108	108	107	107	115	119	119	115	111	105	103

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	139.8Unhealthy for Sensitive Groups	200	54.9	168 / 168
Hai Phong	131.8Unhealthy for Sensitive Groups	187	51.8	168 / 168
Hue	123.9Unhealthy for Sensitive Groups	170	45.1	168 / 168
Can Tho	112.9Unhealthy for Sensitive Groups	139	39.8	168 / 168
Ho Chi Minh City	105.5Unhealthy for Sensitive Groups	133	36.1	168 / 168
Da Nang	104.1Unhealthy for Sensitive Groups	142	37.5	168 / 168
Da Lat	102.2Unhealthy for Sensitive Groups	138	34.4	168 / 168
Nha Trang	83.5Moderate	101	26.2	168 / 168

City-hours by category

Good: 0

Moderate: 446

Unhealthy for Sensitive Groups: 775

Unhealthy: 123

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	102	102	102	102	102	102	103	103	103	104	106	106	108	110	111	112	114	115	117	118	118	119	119	119
Thu	119	119	119	119	119	119	119	119	117	116	115	114	113	111	110	108	107	105	104	102	102	101	101	100
Fri	100	100	100	99	99	99	99	99	100	100	101	102	102	103	104	105	106	107	108	109	110	111	112	113
Sat	114	115	116	116	118	119	120	121	122	122	122	122	123	122	122	122	122	121	121	121	121	121	121	122
Sun	123	123	124	124	124	124	123	123	122	121	120	120	119	119	118	117	117	117	118	118	117	116	115	115
Mon	115	115	114	114	114	114	114	114	114	115	115	116	116	116	117	117	118	118	118	118	118	117	116	115
Tue	115	114	113	112	112	112	111	111	111	110	109	109	108	108	108	107	107	115	119	119	115	111	105	103

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	102	102	102	102	102	102	103	103	103	104	106	106	108	110	111	112	114	115	117	118	118	119	119	119
Thu	119	119	119	119	119	119	119	119	117	116	115	114	113	111	110	108	107	105	104	102	102	101	101	100
Fri	100	100	100	99	99	99	99	99	100	100	101	102	102	103	104	105	106	107	108	109	110	111	112	113
Sat	114	115	116	116	118	119	120	121	122	122	122	122	123	122	122	122	122	121	121	121	121	121	121	122
Sun	123	123	124	124	124	124	123	123	122	121	120	120	119	119	118	117	117	117	118	118	117	116	115	115
Mon	115	115	114	114	114	114	114	114	114	115	115	116	116	116	117	117	118	118	118	118	118	117	116	115
Tue	115	114	113	112	112	112	111	111	111	110	109	109	108	108	108	107	107	115	119	119	115	111	105	103

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	102	102	102	102	102	102	103	103	103	104	106	106	108	110	111	112	114	115	117	118	118	119	119	119
Thu	119	119	119	119	119	119	119	119	117	116	115	114	113	111	110	108	107	105	104	102	102	101	101	100
Fri	100	100	100	99	99	99	99	99	100	100	101	102	102	103	104	105	106	107	108	109	110	111	112	113
Sat	114	115	116	116	118	119	120	121	122	122	122	122	123	122	122	122	122	121	121	121	121	121	121	122
Sun	123	123	124	124	124	124	123	123	122	121	120	120	119	119	118	117	117	117	118	118	117	116	115	115
Mon	115	115	114	114	114	114	114	114	114	115	115	116	116	116	117	117	118	118	118	118	118	117	116	115
Tue	115	114	113	112	112	112	111	111	111	110	109	109	108	108	108	107	107	115	119	119	115	111	105	103