6 – 12 Dec 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

73Weekly mean modelled AQI · Moderate

Mean PM2.5: 20.9 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+20.4 AQI compared with the previous week’s mean of 52.6.

Highest hourly estimate: 280 in Bangkok · 10 Dec, 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, 6 Dec	61.2Moderate	26–187	14.8	192 / 192
Thu, 7 Dec	56.8Moderate	30–123	11.8	192 / 192
Fri, 8 Dec	59.8Moderate	38–155	14.2	192 / 192
Sat, 9 Dec	69.5Moderate	44–213	20.1	192 / 192
Sun, 10 Dec	85.2Moderate	48–280	28.8	192 / 192
Mon, 11 Dec	89.2Moderate	50–278	27.9	192 / 192
Tue, 12 Dec	89.1Moderate	51–228	28.9	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	55	56	57	57	57	58	59	59	59	60	60	60	60	60	60	60	60	66	71	72	71	68	64	61
Thu	61	60	60	59	58	58	57	56	56	55	55	56	56	57	57	57	57	58	58	57	56	54	54	53
Fri	54	53	54	54	55	55	56	56	57	57	58	58	58	58	58	59	63	68	72	73	70	66	62	61
Sat	60	60	60	61	61	62	62	63	63	63	64	64	64	64	65	66	68	80	87	89	88	87	86	82
Sun	77	75	74	73	74	74	75	75	76	76	77	77	77	79	82	84	91	99	105	107	108	107	104	102
Mon	99	95	91	89	86	84	83	83	83	83	83	83	83	83	85	87	90	94	98	100	99	97	94	91
Tue	88	84	84	84	84	84	84	84	84	84	85	85	85	85	87	89	90	97	100	101	99	98	95	96

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
Bangkok	149.1Unhealthy for Sensitive Groups	280	61.4	168 / 168
Pattaya	102.4Unhealthy for Sensitive Groups	242	31.1	168 / 168
Chiang Mai	65.3Moderate	87	17.6	168 / 168
Khon Kaen	61.7Moderate	93	15.3	168 / 168
Chiang Rai	54.7Moderate	65	11.7	168 / 168
Hat Yai	50.5Moderate	58	10.3	168 / 168
Nakhon Ratchasima	50.1Moderate	56	9.9	168 / 168
Phuket	49.9Good	67	10.2	168 / 168

City-hours by category

Good: 227

Moderate: 911

Unhealthy for Sensitive Groups: 93

Unhealthy: 68

Very Unhealthy: 45

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 Pollution Control Department · Air4Thai. 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	55	56	57	57	57	58	59	59	59	60	60	60	60	60	60	60	60	66	71	72	71	68	64	61
Thu	61	60	60	59	58	58	57	56	56	55	55	56	56	57	57	57	57	58	58	57	56	54	54	53
Fri	54	53	54	54	55	55	56	56	57	57	58	58	58	58	58	59	63	68	72	73	70	66	62	61
Sat	60	60	60	61	61	62	62	63	63	63	64	64	64	64	65	66	68	80	87	89	88	87	86	82
Sun	77	75	74	73	74	74	75	75	76	76	77	77	77	79	82	84	91	99	105	107	108	107	104	102
Mon	99	95	91	89	86	84	83	83	83	83	83	83	83	83	85	87	90	94	98	100	99	97	94	91
Tue	88	84	84	84	84	84	84	84	84	84	85	85	85	85	87	89	90	97	100	101	99	98	95	96

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	55	56	57	57	57	58	59	59	59	60	60	60	60	60	60	60	60	66	71	72	71	68	64	61
Thu	61	60	60	59	58	58	57	56	56	55	55	56	56	57	57	57	57	58	58	57	56	54	54	53
Fri	54	53	54	54	55	55	56	56	57	57	58	58	58	58	58	59	63	68	72	73	70	66	62	61
Sat	60	60	60	61	61	62	62	63	63	63	64	64	64	64	65	66	68	80	87	89	88	87	86	82
Sun	77	75	74	73	74	74	75	75	76	76	77	77	77	79	82	84	91	99	105	107	108	107	104	102
Mon	99	95	91	89	86	84	83	83	83	83	83	83	83	83	85	87	90	94	98	100	99	97	94	91
Tue	88	84	84	84	84	84	84	84	84	84	85	85	85	85	87	89	90	97	100	101	99	98	95	96

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	55	56	57	57	57	58	59	59	59	60	60	60	60	60	60	60	60	66	71	72	71	68	64	61
Thu	61	60	60	59	58	58	57	56	56	55	55	56	56	57	57	57	57	58	58	57	56	54	54	53
Fri	54	53	54	54	55	55	56	56	57	57	58	58	58	58	58	59	63	68	72	73	70	66	62	61
Sat	60	60	60	61	61	62	62	63	63	63	64	64	64	64	65	66	68	80	87	89	88	87	86	82
Sun	77	75	74	73	74	74	75	75	76	76	77	77	77	79	82	84	91	99	105	107	108	107	104	102
Mon	99	95	91	89	86	84	83	83	83	83	83	83	83	83	85	87	90	94	98	100	99	97	94	91
Tue	88	84	84	84	84	84	84	84	84	84	85	85	85	85	87	89	90	97	100	101	99	98	95	96