10 – 16 Dec 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

62.5Weekly mean modelled AQI · Moderate

Mean PM2.5: 14.7 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-3.5 AQI compared with the previous week’s mean of 66.

Highest hourly estimate: 208 in Bangkok · 16 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, 10 Dec	69.1Moderate	51–143	17.9	192 / 192
Thu, 11 Dec	67.8Moderate	53–107	16.3	192 / 192
Fri, 12 Dec	62.4Moderate	31–161	14.8	192 / 192
Sat, 13 Dec	59Moderate	21–125	15.5	192 / 192
Sun, 14 Dec	58.5Moderate	36–95	11.7	192 / 192
Mon, 15 Dec	57.7Moderate	28–172	12.1	192 / 192
Tue, 16 Dec	63.2Moderate	30–208	14.4	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	68	68	68	68	67	67	67	67	67	66	66	66	66	66	67	68	73	77	79	78	75	71	68	67
Thu	67	67	67	67	68	68	68	68	68	68	67	67	67	68	69	70	70	72	73	70	67	65	64	64
Fri	64	64	63	63	62	62	61	60	60	60	59	59	58	58	58	57	60	65	70	73	72	69	64	59
Sat	57	57	57	57	57	57	58	58	57	57	57	58	58	58	59	59	59	62	65	66	64	60	60	60
Sun	60	60	60	61	60	60	60	60	59	58	58	57	56	56	55	56	56	58	59	60	60	60	59	58
Mon	56	55	54	54	53	52	51	51	50	50	50	50	51	52	53	54	61	70	75	77	74	71	65	58
Tue	55	54	53	53	52	52	53	53	54	54	55	56	56	57	61	66	72	81	86	86	84	81	75	67

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	92.7Moderate	208	26.3	168 / 168
Chiang Mai	88.1Moderate	108	27.9	168 / 168
Pattaya	62.8Moderate	125	12.3	168 / 168
Chiang Rai	60Moderate	69	14.2	168 / 168
Khon Kaen	51.5Moderate	78	9.9	168 / 168
Nakhon Ratchasima	49.7Good	70	9.2	168 / 168
Hat Yai	48.9Good	60	9.5	168 / 168
Phuket	46.4Good	93	8	168 / 168

City-hours by category

Good: 404

Moderate: 894

Unhealthy for Sensitive Groups: 34

Unhealthy: 9

Very Unhealthy: 3

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	68	68	68	68	67	67	67	67	67	66	66	66	66	66	67	68	73	77	79	78	75	71	68	67
Thu	67	67	67	67	68	68	68	68	68	68	67	67	67	68	69	70	70	72	73	70	67	65	64	64
Fri	64	64	63	63	62	62	61	60	60	60	59	59	58	58	58	57	60	65	70	73	72	69	64	59
Sat	57	57	57	57	57	57	58	58	57	57	57	58	58	58	59	59	59	62	65	66	64	60	60	60
Sun	60	60	60	61	60	60	60	60	59	58	58	57	56	56	55	56	56	58	59	60	60	60	59	58
Mon	56	55	54	54	53	52	51	51	50	50	50	50	51	52	53	54	61	70	75	77	74	71	65	58
Tue	55	54	53	53	52	52	53	53	54	54	55	56	56	57	61	66	72	81	86	86	84	81	75	67

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	68	68	68	68	67	67	67	67	67	66	66	66	66	66	67	68	73	77	79	78	75	71	68	67
Thu	67	67	67	67	68	68	68	68	68	68	67	67	67	68	69	70	70	72	73	70	67	65	64	64
Fri	64	64	63	63	62	62	61	60	60	60	59	59	58	58	58	57	60	65	70	73	72	69	64	59
Sat	57	57	57	57	57	57	58	58	57	57	57	58	58	58	59	59	59	62	65	66	64	60	60	60
Sun	60	60	60	61	60	60	60	60	59	58	58	57	56	56	55	56	56	58	59	60	60	60	59	58
Mon	56	55	54	54	53	52	51	51	50	50	50	50	51	52	53	54	61	70	75	77	74	71	65	58
Tue	55	54	53	53	52	52	53	53	54	54	55	56	56	57	61	66	72	81	86	86	84	81	75	67

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	68	68	68	68	67	67	67	67	67	66	66	66	66	66	67	68	73	77	79	78	75	71	68	67
Thu	67	67	67	67	68	68	68	68	68	68	67	67	67	68	69	70	70	72	73	70	67	65	64	64
Fri	64	64	63	63	62	62	61	60	60	60	59	59	58	58	58	57	60	65	70	73	72	69	64	59
Sat	57	57	57	57	57	57	58	58	57	57	57	58	58	58	59	59	59	62	65	66	64	60	60	60
Sun	60	60	60	61	60	60	60	60	59	58	58	57	56	56	55	56	56	58	59	60	60	60	59	58
Mon	56	55	54	54	53	52	51	51	50	50	50	50	51	52	53	54	61	70	75	77	74	71	65	58
Tue	55	54	53	53	52	52	53	53	54	54	55	56	56	57	61	66	72	81	86	86	84	81	75	67