17 – 23 Dec 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

62Weekly mean modelled AQI · Moderate

Mean PM2.5: 14.6 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-0.5 AQI compared with the previous week’s mean of 62.5.

Highest hourly estimate: 166 in Bangkok · 23 Dec, 20:00 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 Dec	59.6Moderate	34–122	12.2	192 / 192
Thu, 18 Dec	53.3Moderate	29–103	11.9	192 / 192
Fri, 19 Dec	62.8Moderate	30–156	16.3	192 / 192
Sat, 20 Dec	71.6Moderate	36–162	19.2	192 / 192
Sun, 21 Dec	65.5Moderate	47–119	14.1	192 / 192
Mon, 22 Dec	58.1Moderate	38–113	12.6	192 / 192
Tue, 23 Dec	63.4Moderate	38–166	15.9	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	62	59	59	60	59	59	59	59	58	57	57	57	56	56	56	57	61	65	69	68	65	60	57	54
Thu	53	52	52	51	51	51	51	51	51	51	51	51	52	52	53	54	55	57	60	60	57	54	54	54
Fri	53	53	53	54	54	54	55	55	56	57	58	59	59	60	61	63	66	75	81	81	79	77	73	72
Sat	71	70	68	66	64	64	65	65	66	66	67	68	68	69	70	71	75	84	90	89	83	77	73	70
Sun	70	70	69	69	69	68	68	67	67	66	65	65	64	64	63	63	64	65	67	66	64	62	60	60
Mon	59	59	58	58	58	58	58	58	57	57	56	56	56	55	56	56	58	61	65	66	63	58	56	56
Tue	55	55	55	55	55	56	56	56	57	58	59	59	60	61	62	63	64	70	76	79	80	80	77	75

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	98.6Moderate	166	32.1	168 / 168
Chiang Mai	78.9Moderate	132	23.4	168 / 168
Pattaya	61.6Moderate	133	10.5	168 / 168
Chiang Rai	57.8Moderate	72	12.8	168 / 168
Khon Kaen	52.2Moderate	68	11	168 / 168
Phuket	50.2Moderate	85	8.3	168 / 168
Hat Yai	50.1Moderate	57	9.6	168 / 168
Nakhon Ratchasima	46.8Good	72	9.1	168 / 168

City-hours by category

Good: 386

Moderate: 872

Unhealthy for Sensitive Groups: 76

Unhealthy: 10

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 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	62	59	59	60	59	59	59	59	58	57	57	57	56	56	56	57	61	65	69	68	65	60	57	54
Thu	53	52	52	51	51	51	51	51	51	51	51	51	52	52	53	54	55	57	60	60	57	54	54	54
Fri	53	53	53	54	54	54	55	55	56	57	58	59	59	60	61	63	66	75	81	81	79	77	73	72
Sat	71	70	68	66	64	64	65	65	66	66	67	68	68	69	70	71	75	84	90	89	83	77	73	70
Sun	70	70	69	69	69	68	68	67	67	66	65	65	64	64	63	63	64	65	67	66	64	62	60	60
Mon	59	59	58	58	58	58	58	58	57	57	56	56	56	55	56	56	58	61	65	66	63	58	56	56
Tue	55	55	55	55	55	56	56	56	57	58	59	59	60	61	62	63	64	70	76	79	80	80	77	75

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	59	59	60	59	59	59	59	58	57	57	57	56	56	56	57	61	65	69	68	65	60	57	54
Thu	53	52	52	51	51	51	51	51	51	51	51	51	52	52	53	54	55	57	60	60	57	54	54	54
Fri	53	53	53	54	54	54	55	55	56	57	58	59	59	60	61	63	66	75	81	81	79	77	73	72
Sat	71	70	68	66	64	64	65	65	66	66	67	68	68	69	70	71	75	84	90	89	83	77	73	70
Sun	70	70	69	69	69	68	68	67	67	66	65	65	64	64	63	63	64	65	67	66	64	62	60	60
Mon	59	59	58	58	58	58	58	58	57	57	56	56	56	55	56	56	58	61	65	66	63	58	56	56
Tue	55	55	55	55	55	56	56	56	57	58	59	59	60	61	62	63	64	70	76	79	80	80	77	75

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	59	59	60	59	59	59	59	58	57	57	57	56	56	56	57	61	65	69	68	65	60	57	54
Thu	53	52	52	51	51	51	51	51	51	51	51	51	52	52	53	54	55	57	60	60	57	54	54	54
Fri	53	53	53	54	54	54	55	55	56	57	58	59	59	60	61	63	66	75	81	81	79	77	73	72
Sat	71	70	68	66	64	64	65	65	66	66	67	68	68	69	70	71	75	84	90	89	83	77	73	70
Sun	70	70	69	69	69	68	68	67	67	66	65	65	64	64	63	63	64	65	67	66	64	62	60	60
Mon	59	59	58	58	58	58	58	58	57	57	56	56	56	55	56	56	58	61	65	66	63	58	56	56
Tue	55	55	55	55	55	56	56	56	57	58	59	59	60	61	62	63	64	70	76	79	80	80	77	75