12 – 18 Aug 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

42.5Weekly mean modelled AQI · Good

Mean PM2.5: 8.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+2.4 AQI compared with the previous week’s mean of 40.1.

Highest hourly estimate: 66 in Chiang Mai · 18 Aug, 14:00 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, 12 Aug	40.4Good	16–57	7.9	192 / 192
Thu, 13 Aug	43.8Good	30–59	7.8	192 / 192
Fri, 14 Aug	38.7Good	20–60	7.6	192 / 192
Sat, 15 Aug	43.9Good	19–65	8.8	192 / 192
Sun, 16 Aug	40.5Good	20–63	6.8	192 / 192
Mon, 17 Aug	39.6Good	16–55	8.8	192 / 192
Tue, 18 Aug	50.7Moderate	25–66	10.7	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	38	38	38	38	38	39	39	39	40	40	40	40	41	41	41	41	42	42	42	42	43	43	43	44
Thu	44	44	44	44	44	44	44	45	45	45	45	45	45	45	44	44	44	43	43	43	42	42	42	41
Fri	41	41	41	40	40	39	39	38	38	37	37	36	36	36	36	37	39	40	40	40	40	40	40	40
Sat	40	40	40	40	41	42	42	42	43	44	45	45	46	46	46	46	47	46	47	46	46	46	45	45
Sun	44	44	44	43	43	43	42	42	42	41	41	40	40	40	39	39	39	39	39	39	38	38	37	37
Mon	37	37	37	37	38	38	38	38	38	38	38	38	38	39	39	40	40	41	42	42	43	44	45	46
Tue	46	46	47	47	47	48	48	48	49	50	51	52	52	53	53	53	53	54	54	54	53	53	53	52

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	56.5Moderate	66	12.9	168 / 168
Phuket	47.7Good	58	9.2	168 / 168
Chiang Rai	46.1Good	56	8.8	168 / 168
Hat Yai	42.9Good	55	7.8	168 / 168
Nakhon Ratchasima	40.8Good	51	7.5	168 / 168
Bangkok	40Good	64	8.2	168 / 168
Khon Kaen	39.8Good	53	7.6	168 / 168
Pattaya	26.2Good	44	4.8	168 / 168

City-hours by category

Good: 955

Moderate: 389

Unhealthy for Sensitive Groups: 0

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	38	38	38	38	38	39	39	39	40	40	40	40	41	41	41	41	42	42	42	42	43	43	43	44
Thu	44	44	44	44	44	44	44	45	45	45	45	45	45	45	44	44	44	43	43	43	42	42	42	41
Fri	41	41	41	40	40	39	39	38	38	37	37	36	36	36	36	37	39	40	40	40	40	40	40	40
Sat	40	40	40	40	41	42	42	42	43	44	45	45	46	46	46	46	47	46	47	46	46	46	45	45
Sun	44	44	44	43	43	43	42	42	42	41	41	40	40	40	39	39	39	39	39	39	38	38	37	37
Mon	37	37	37	37	38	38	38	38	38	38	38	38	38	39	39	40	40	41	42	42	43	44	45	46
Tue	46	46	47	47	47	48	48	48	49	50	51	52	52	53	53	53	53	54	54	54	53	53	53	52

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	38	38	38	38	38	39	39	39	40	40	40	40	41	41	41	41	42	42	42	42	43	43	43	44
Thu	44	44	44	44	44	44	44	45	45	45	45	45	45	45	44	44	44	43	43	43	42	42	42	41
Fri	41	41	41	40	40	39	39	38	38	37	37	36	36	36	36	37	39	40	40	40	40	40	40	40
Sat	40	40	40	40	41	42	42	42	43	44	45	45	46	46	46	46	47	46	47	46	46	46	45	45
Sun	44	44	44	43	43	43	42	42	42	41	41	40	40	40	39	39	39	39	39	39	38	38	37	37
Mon	37	37	37	37	38	38	38	38	38	38	38	38	38	39	39	40	40	41	42	42	43	44	45	46
Tue	46	46	47	47	47	48	48	48	49	50	51	52	52	53	53	53	53	54	54	54	53	53	53	52

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	38	38	38	38	38	39	39	39	40	40	40	40	41	41	41	41	42	42	42	42	43	43	43	44
Thu	44	44	44	44	44	44	44	45	45	45	45	45	45	45	44	44	44	43	43	43	42	42	42	41
Fri	41	41	41	40	40	39	39	38	38	37	37	36	36	36	36	37	39	40	40	40	40	40	40	40
Sat	40	40	40	40	41	42	42	42	43	44	45	45	46	46	46	46	47	46	47	46	46	46	45	45
Sun	44	44	44	43	43	43	42	42	42	41	41	40	40	40	39	39	39	39	39	39	38	38	37	37
Mon	37	37	37	37	38	38	38	38	38	38	38	38	38	39	39	40	40	41	42	42	43	44	45	46
Tue	46	46	47	47	47	48	48	48	49	50	51	52	52	53	53	53	53	54	54	54	53	53	53	52