19 – 25 Aug 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

42.8Weekly mean modelled AQI · Good

Mean PM2.5: 8.7 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+0.3 AQI compared with the previous week’s mean of 42.5.

Highest hourly estimate: 153 in Hat Yai · 22 Aug, 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, 19 Aug	47Good	20–65	8.5	192 / 192
Thu, 20 Aug	40.2Good	19–62	6.7	192 / 192
Fri, 21 Aug	38.5Good	18–81	8.6	192 / 192
Sat, 22 Aug	47.5Good	19–153	9.5	192 / 192
Sun, 23 Aug	42.2Good	17–108	9.5	192 / 192
Mon, 24 Aug	41.6Good	18–93	9.5	192 / 192
Tue, 25 Aug	42.8Good	16–94	8.4	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	52	51	51	51	51	50	50	50	49	48	48	47	47	46	46	45	44	44	44	44	43	43	43	42
Thu	42	42	42	42	41	41	41	40	40	40	40	40	40	39	39	39	39	40	40	40	40	39	39	38
Fri	38	38	37	37	36	36	36	36	35	35	35	35	36	36	37	38	39	41	43	45	45	45	44	44
Sat	43	44	44	44	45	45	45	45	45	45	45	45	45	45	47	50	52	54	55	55	54	52	50	47
Sun	44	41	40	39	39	39	39	39	40	41	41	42	42	43	43	43	45	47	47	46	45	44	43	43
Mon	43	43	43	43	43	44	44	44	43	42	41	41	40	40	40	40	41	41	41	41	41	41	41	41
Tue	42	41	42	42	42	41	41	42	42	42	42	43	43	43	43	44	44	44	44	44	44	44	44	44

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	72.6Moderate	153	18.8	168 / 168
Phuket	54.2Moderate	68	12.3	168 / 168
Chiang Mai	51.7Moderate	65	10.1	168 / 168
Chiang Rai	45.3Good	56	8.2	168 / 168
Nakhon Ratchasima	32.6Good	49	5.5	168 / 168
Khon Kaen	32.2Good	53	5.4	168 / 168
Bangkok	31Good	58	5.4	168 / 168
Pattaya	23Good	32	3.7	168 / 168

City-hours by category

Good: 895

Moderate: 436

Unhealthy for Sensitive Groups: 11

Unhealthy: 2

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	52	51	51	51	51	50	50	50	49	48	48	47	47	46	46	45	44	44	44	44	43	43	43	42
Thu	42	42	42	42	41	41	41	40	40	40	40	40	40	39	39	39	39	40	40	40	40	39	39	38
Fri	38	38	37	37	36	36	36	36	35	35	35	35	36	36	37	38	39	41	43	45	45	45	44	44
Sat	43	44	44	44	45	45	45	45	45	45	45	45	45	45	47	50	52	54	55	55	54	52	50	47
Sun	44	41	40	39	39	39	39	39	40	41	41	42	42	43	43	43	45	47	47	46	45	44	43	43
Mon	43	43	43	43	43	44	44	44	43	42	41	41	40	40	40	40	41	41	41	41	41	41	41	41
Tue	42	41	42	42	42	41	41	42	42	42	42	43	43	43	43	44	44	44	44	44	44	44	44	44

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	52	51	51	51	51	50	50	50	49	48	48	47	47	46	46	45	44	44	44	44	43	43	43	42
Thu	42	42	42	42	41	41	41	40	40	40	40	40	40	39	39	39	39	40	40	40	40	39	39	38
Fri	38	38	37	37	36	36	36	36	35	35	35	35	36	36	37	38	39	41	43	45	45	45	44	44
Sat	43	44	44	44	45	45	45	45	45	45	45	45	45	45	47	50	52	54	55	55	54	52	50	47
Sun	44	41	40	39	39	39	39	39	40	41	41	42	42	43	43	43	45	47	47	46	45	44	43	43
Mon	43	43	43	43	43	44	44	44	43	42	41	41	40	40	40	40	41	41	41	41	41	41	41	41
Tue	42	41	42	42	42	41	41	42	42	42	42	43	43	43	43	44	44	44	44	44	44	44	44	44

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	52	51	51	51	51	50	50	50	49	48	48	47	47	46	46	45	44	44	44	44	43	43	43	42
Thu	42	42	42	42	41	41	41	40	40	40	40	40	40	39	39	39	39	40	40	40	40	39	39	38
Fri	38	38	37	37	36	36	36	36	35	35	35	35	36	36	37	38	39	41	43	45	45	45	44	44
Sat	43	44	44	44	45	45	45	45	45	45	45	45	45	45	47	50	52	54	55	55	54	52	50	47
Sun	44	41	40	39	39	39	39	39	40	41	41	42	42	43	43	43	45	47	47	46	45	44	43	43
Mon	43	43	43	43	43	44	44	44	43	42	41	41	40	40	40	40	41	41	41	41	41	41	41	41
Tue	42	41	42	42	42	41	41	42	42	42	42	43	43	43	43	44	44	44	44	44	44	44	44	44