20 – 26 Aug 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

47.7Weekly mean modelled AQI · Good

Mean PM2.5: 9.5 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-1.6 AQI compared with the previous week’s mean of 49.3.

Highest hourly estimate: 108 in Bangkok · 21 Aug, 18:00 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, 20 Aug	55.1Moderate	22–99	12.2	192 / 192
Thu, 21 Aug	55.4Moderate	25–108	12.2	192 / 192
Fri, 22 Aug	49.6Good	20–66	9.3	192 / 192
Sat, 23 Aug	43Good	14–60	7.4	192 / 192
Sun, 24 Aug	40.6Good	18–56	8.4	192 / 192
Mon, 25 Aug	47.1Good	18–63	9.4	192 / 192
Tue, 26 Aug	43.4Good	21–65	7.8	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	54	54	54	54	54	54	54	54	54	54	54	54	54	54	54	56	59	61	61	59	56	55	54
Thu	54	54	54	54	54	54	54	55	54	55	55	55	55	55	55	55	57	61	61	59	57	55	55	54
Fri	54	54	53	53	53	53	52	52	51	50	50	49	48	48	47	48	48	48	48	48	47	47	46	46
Sat	45	44	45	44	44	44	43	43	43	43	43	43	43	43	43	43	43	43	43	43	42	42	41	41
Sun	40	40	40	39	39	39	38	38	38	38	39	39	40	40	41	41	42	43	43	43	43	43	44	44
Mon	45	45	45	46	46	46	47	47	47	47	47	48	48	48	48	48	48	48	48	48	48	48	48	48
Tue	47	47	46	46	46	46	45	45	44	44	43	43	43	42	42	42	42	42	41	41	41	41	41	41

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
Chiang Mai	57.4Moderate	66	13.5	168 / 168
Khon Kaen	57.4Moderate	79	12.6	168 / 168
Nakhon Ratchasima	54.6Moderate	66	11.4	168 / 168
Bangkok	52.6Moderate	108	10.3	168 / 168
Chiang Rai	49.8Good	56	9.4	168 / 168
Hat Yai	44.5Good	72	8	168 / 168
Phuket	39.3Good	53	7.1	168 / 168
Pattaya	26.3Good	47	4.1	168 / 168

City-hours by category

Good: 673

Moderate: 669

Unhealthy for Sensitive Groups: 2

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	55	54	54	54	54	54	54	54	54	54	54	54	54	54	54	54	56	59	61	61	59	56	55	54
Thu	54	54	54	54	54	54	54	55	54	55	55	55	55	55	55	55	57	61	61	59	57	55	55	54
Fri	54	54	53	53	53	53	52	52	51	50	50	49	48	48	47	48	48	48	48	48	47	47	46	46
Sat	45	44	45	44	44	44	43	43	43	43	43	43	43	43	43	43	43	43	43	43	42	42	41	41
Sun	40	40	40	39	39	39	38	38	38	38	39	39	40	40	41	41	42	43	43	43	43	43	44	44
Mon	45	45	45	46	46	46	47	47	47	47	47	48	48	48	48	48	48	48	48	48	48	48	48	48
Tue	47	47	46	46	46	46	45	45	44	44	43	43	43	42	42	42	42	42	41	41	41	41	41	41

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	54	54	54	54	54	54	54	54	54	54	54	54	54	54	54	56	59	61	61	59	56	55	54
Thu	54	54	54	54	54	54	54	55	54	55	55	55	55	55	55	55	57	61	61	59	57	55	55	54
Fri	54	54	53	53	53	53	52	52	51	50	50	49	48	48	47	48	48	48	48	48	47	47	46	46
Sat	45	44	45	44	44	44	43	43	43	43	43	43	43	43	43	43	43	43	43	43	42	42	41	41
Sun	40	40	40	39	39	39	38	38	38	38	39	39	40	40	41	41	42	43	43	43	43	43	44	44
Mon	45	45	45	46	46	46	47	47	47	47	47	48	48	48	48	48	48	48	48	48	48	48	48	48
Tue	47	47	46	46	46	46	45	45	44	44	43	43	43	42	42	42	42	42	41	41	41	41	41	41

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	54	54	54	54	54	54	54	54	54	54	54	54	54	54	54	56	59	61	61	59	56	55	54
Thu	54	54	54	54	54	54	54	55	54	55	55	55	55	55	55	55	57	61	61	59	57	55	55	54
Fri	54	54	53	53	53	53	52	52	51	50	50	49	48	48	47	48	48	48	48	48	47	47	46	46
Sat	45	44	45	44	44	44	43	43	43	43	43	43	43	43	43	43	43	43	43	43	42	42	41	41
Sun	40	40	40	39	39	39	38	38	38	38	39	39	40	40	41	41	42	43	43	43	43	43	44	44
Mon	45	45	45	46	46	46	47	47	47	47	47	48	48	48	48	48	48	48	48	48	48	48	48	48
Tue	47	47	46	46	46	46	45	45	44	44	43	43	43	42	42	42	42	42	41	41	41	41	41	41