3 – 9 May 2023 · Vietnam · Wednesday to Tuesday, UTC+7

Vietnam weekly air quality

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

76.6Weekly mean modelled AQI · Moderate

Mean PM2.5: 22.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Vietnam’s official index.

+5.9 AQI compared with the previous week’s mean of 70.7.

Highest hourly estimate: 215 in Hanoi · 5 May, 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, 3 May	57.7Moderate	39–91	12.5	192 / 192
Thu, 4 May	59.4Moderate	43–121	16.4	192 / 192
Fri, 5 May	77.1Moderate	50–215	24.6	192 / 192
Sat, 6 May	87.6Moderate	54–201	26.7	192 / 192
Sun, 7 May	85.9Moderate	54–153	26.4	192 / 192
Mon, 8 May	87.2Moderate	57–139	27	192 / 192
Tue, 9 May	81.2Moderate	56–118	23.3	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	62	62	61	60	60	59	59	58	57	57	57	56	56	56	56	56	57	57	57	57	57	57	56	56
Thu	56	56	56	56	56	56	56	57	57	57	57	58	58	58	59	59	60	64	66	67	66	65	63	63
Fri	64	65	65	66	67	67	68	69	69	70	70	71	72	75	77	80	86	93	98	99	97	93	89	85
Sat	80	80	80	80	81	81	81	81	81	81	82	82	83	83	85	90	98	108	112	110	103	93	84	84
Sun	84	84	84	84	84	84	84	84	84	83	83	83	82	82	81	83	88	94	98	97	93	90	88	85
Mon	84	84	84	85	86	87	87	88	89	90	90	90	90	90	89	89	88	88	87	87	86	85	85	84
Tue	84	84	83	83	83	82	82	81	81	80	80	80	79	79	79	79	79	81	83	85	84	82	80	79

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	98.1Moderate	215	30.1	168 / 168
Da Nang	84Moderate	153	25.4	168 / 168
Hue	82.5Moderate	132	26	168 / 168
Ho Chi Minh City	79.6Moderate	146	25.2	168 / 168
Hai Phong	77.5Moderate	149	21.8	168 / 168
Nha Trang	68.7Moderate	98	19.2	168 / 168
Can Tho	61.2Moderate	76	15.7	168 / 168
Da Lat	61Moderate	82	15.9	168 / 168

City-hours by category

Good: 51

Moderate: 1147

Unhealthy for Sensitive Groups: 131

Unhealthy: 8

Very Unhealthy: 7

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	62	62	61	60	60	59	59	58	57	57	57	56	56	56	56	56	57	57	57	57	57	57	56	56
Thu	56	56	56	56	56	56	56	57	57	57	57	58	58	58	59	59	60	64	66	67	66	65	63	63
Fri	64	65	65	66	67	67	68	69	69	70	70	71	72	75	77	80	86	93	98	99	97	93	89	85
Sat	80	80	80	80	81	81	81	81	81	81	82	82	83	83	85	90	98	108	112	110	103	93	84	84
Sun	84	84	84	84	84	84	84	84	84	83	83	83	82	82	81	83	88	94	98	97	93	90	88	85
Mon	84	84	84	85	86	87	87	88	89	90	90	90	90	90	89	89	88	88	87	87	86	85	85	84
Tue	84	84	83	83	83	82	82	81	81	80	80	80	79	79	79	79	79	81	83	85	84	82	80	79

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	62	62	61	60	60	59	59	58	57	57	57	56	56	56	56	56	57	57	57	57	57	57	56	56
Thu	56	56	56	56	56	56	56	57	57	57	57	58	58	58	59	59	60	64	66	67	66	65	63	63
Fri	64	65	65	66	67	67	68	69	69	70	70	71	72	75	77	80	86	93	98	99	97	93	89	85
Sat	80	80	80	80	81	81	81	81	81	81	82	82	83	83	85	90	98	108	112	110	103	93	84	84
Sun	84	84	84	84	84	84	84	84	84	83	83	83	82	82	81	83	88	94	98	97	93	90	88	85
Mon	84	84	84	85	86	87	87	88	89	90	90	90	90	90	89	89	88	88	87	87	86	85	85	84
Tue	84	84	83	83	83	82	82	81	81	80	80	80	79	79	79	79	79	81	83	85	84	82	80	79

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	62	62	61	60	60	59	59	58	57	57	57	56	56	56	56	56	57	57	57	57	57	57	56	56
Thu	56	56	56	56	56	56	56	57	57	57	57	58	58	58	59	59	60	64	66	67	66	65	63	63
Fri	64	65	65	66	67	67	68	69	69	70	70	71	72	75	77	80	86	93	98	99	97	93	89	85
Sat	80	80	80	80	81	81	81	81	81	81	82	82	83	83	85	90	98	108	112	110	103	93	84	84
Sun	84	84	84	84	84	84	84	84	84	83	83	83	82	82	81	83	88	94	98	97	93	90	88	85
Mon	84	84	84	85	86	87	87	88	89	90	90	90	90	90	89	89	88	88	87	87	86	85	85	84
Tue	84	84	83	83	83	82	82	81	81	80	80	80	79	79	79	79	79	81	83	85	84	82	80	79