26 Aug – 1 Sep 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

39.8Weekly mean modelled AQI · Good

Mean PM2.5: 7.8 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-3 AQI compared with the previous week’s mean of 42.8.

Highest hourly estimate: 119 in Hat Yai · 28 Aug, 23:00 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, 26 Aug	41.9Good	20–62	8.3	192 / 192
Thu, 27 Aug	39.6Good	19–61	6	192 / 192
Fri, 28 Aug	37.8Good	15–119	9.8	192 / 192
Sat, 29 Aug	44.2Good	18–117	8.3	192 / 192
Sun, 30 Aug	37.6Good	18–79	6.4	192 / 192
Mon, 31 Aug	36Good	18–54	6.8	192 / 192
Tue, 1 Sep	41.7Good	18–63	9.1	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	44	44	44	44	43	43	43	42	41	41	41	40	40	40	40	41	42	43	43	42	42	42	41	41
Thu	41	42	42	41	41	41	40	40	40	40	40	39	39	39	39	39	40	40	40	40	39	38	37	36
Fri	34	34	33	32	32	32	32	32	33	33	34	35	36	37	38	40	41	44	45	46	46	46	47	47
Sat	46	46	45	44	45	45	45	45	45	45	44	44	43	43	43	43	44	45	45	45	44	43	42	42
Sun	41	40	39	38	37	37	37	36	36	36	37	37	37	37	38	38	39	39	39	38	38	37	37	36
Mon	36	36	36	35	35	35	35	36	35	35	35	35	35	36	36	36	36	37	37	38	37	37	37	37
Tue	37	37	37	38	38	39	39	39	40	40	40	40	41	41	43	44	45	46	47	47	46	46	46	46

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
Hat Yai	57.4Moderate	119	14.1	168 / 168
Phuket	54Moderate	62	11.2	168 / 168
Chiang Mai	51.9Moderate	63	10.7	168 / 168
Chiang Rai	37.9Good	52	6.8	168 / 168
Khon Kaen	35Good	43	6.1	168 / 168
Nakhon Ratchasima	32Good	45	5.7	168 / 168
Bangkok	28Good	51	4.9	168 / 168
Pattaya	22.5Good	32	3	168 / 168

City-hours by category

Good: 1025

Moderate: 311

Unhealthy for Sensitive Groups: 8

Unhealthy: 0

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	44	44	44	44	43	43	43	42	41	41	41	40	40	40	40	41	42	43	43	42	42	42	41	41
Thu	41	42	42	41	41	41	40	40	40	40	40	39	39	39	39	39	40	40	40	40	39	38	37	36
Fri	34	34	33	32	32	32	32	32	33	33	34	35	36	37	38	40	41	44	45	46	46	46	47	47
Sat	46	46	45	44	45	45	45	45	45	45	44	44	43	43	43	43	44	45	45	45	44	43	42	42
Sun	41	40	39	38	37	37	37	36	36	36	37	37	37	37	38	38	39	39	39	38	38	37	37	36
Mon	36	36	36	35	35	35	35	36	35	35	35	35	35	36	36	36	36	37	37	38	37	37	37	37
Tue	37	37	37	38	38	39	39	39	40	40	40	40	41	41	43	44	45	46	47	47	46	46	46	46

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	44	44	44	44	43	43	43	42	41	41	41	40	40	40	40	41	42	43	43	42	42	42	41	41
Thu	41	42	42	41	41	41	40	40	40	40	40	39	39	39	39	39	40	40	40	40	39	38	37	36
Fri	34	34	33	32	32	32	32	32	33	33	34	35	36	37	38	40	41	44	45	46	46	46	47	47
Sat	46	46	45	44	45	45	45	45	45	45	44	44	43	43	43	43	44	45	45	45	44	43	42	42
Sun	41	40	39	38	37	37	37	36	36	36	37	37	37	37	38	38	39	39	39	38	38	37	37	36
Mon	36	36	36	35	35	35	35	36	35	35	35	35	35	36	36	36	36	37	37	38	37	37	37	37
Tue	37	37	37	38	38	39	39	39	40	40	40	40	41	41	43	44	45	46	47	47	46	46	46	46

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	44	44	44	44	43	43	43	42	41	41	41	40	40	40	40	41	42	43	43	42	42	42	41	41
Thu	41	42	42	41	41	41	40	40	40	40	40	39	39	39	39	39	40	40	40	40	39	38	37	36
Fri	34	34	33	32	32	32	32	32	33	33	34	35	36	37	38	40	41	44	45	46	46	46	47	47
Sat	46	46	45	44	45	45	45	45	45	45	44	44	43	43	43	43	44	45	45	45	44	43	42	42
Sun	41	40	39	38	37	37	37	36	36	36	37	37	37	37	38	38	39	39	39	38	38	37	37	36
Mon	36	36	36	35	35	35	35	36	35	35	35	35	35	36	36	36	36	37	37	38	37	37	37	37
Tue	37	37	37	38	38	39	39	39	40	40	40	40	41	41	43	44	45	46	47	47	46	46	46	46