5 – 11 Aug 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

40.1Weekly mean modelled AQI · Good

Mean PM2.5: 7.3 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-6.2 AQI compared with the previous week’s mean of 46.3.

Highest hourly estimate: 95 in Hat Yai · 6 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, 5 Aug	46.5Good	32–57	8.3	192 / 192
Thu, 6 Aug	42.2Good	24–95	8.1	192 / 192
Fri, 7 Aug	42.8Good	25–64	7.8	192 / 192
Sat, 8 Aug	40.4Good	25–56	7.2	192 / 192
Sun, 9 Aug	38.2Good	19–52	6.6	192 / 192
Mon, 10 Aug	34.8Good	17–51	5.8	192 / 192
Tue, 11 Aug	35.4Good	16–61	7.3	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	49	48	48	47	47	47	47	47	46	46	47	46	47	47	47	47	47	47	46	46	46	45	45	44
Thu	44	44	44	43	43	43	42	42	42	42	42	41	41	41	40	41	41	43	44	45	44	42	40	40
Fri	41	41	41	42	42	43	43	43	44	44	44	44	44	44	43	43	44	43	43	43	43	43	42	42
Sat	41	41	41	41	40	40	40	40	40	40	40	40	40	40	41	40	40	41	41	41	41	41	40	40
Sun	39	39	39	39	39	39	39	39	39	39	38	38	38	38	38	38	38	38	38	38	37	37	37	37
Mon	37	37	36	36	36	35	35	35	34	34	34	34	34	34	34	34	35	35	35	35	35	34	34	33
Tue	33	33	34	34	33	34	34	34	34	34	34	34	34	35	35	36	37	38	39	39	39	39	38	38

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
Phuket	50.9Moderate	57	10.1	168 / 168
Hat Yai	50.6Moderate	95	10.1	168 / 168
Chiang Mai	44.1Good	61	8.5	168 / 168
Khon Kaen	41.1Good	53	7.2	168 / 168
Chiang Rai	40.8Good	51	7.3	168 / 168
Nakhon Ratchasima	34.8Good	55	5.7	168 / 168
Bangkok	30.9Good	51	5.2	168 / 168
Pattaya	27.1Good	42	4.3	168 / 168

City-hours by category

Good: 1098

Moderate: 246

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	49	48	48	47	47	47	47	47	46	46	47	46	47	47	47	47	47	47	46	46	46	45	45	44
Thu	44	44	44	43	43	43	42	42	42	42	42	41	41	41	40	41	41	43	44	45	44	42	40	40
Fri	41	41	41	42	42	43	43	43	44	44	44	44	44	44	43	43	44	43	43	43	43	43	42	42
Sat	41	41	41	41	40	40	40	40	40	40	40	40	40	40	41	40	40	41	41	41	41	41	40	40
Sun	39	39	39	39	39	39	39	39	39	39	38	38	38	38	38	38	38	38	38	38	37	37	37	37
Mon	37	37	36	36	36	35	35	35	34	34	34	34	34	34	34	34	35	35	35	35	35	34	34	33
Tue	33	33	34	34	33	34	34	34	34	34	34	34	34	35	35	36	37	38	39	39	39	39	38	38

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	49	48	48	47	47	47	47	47	46	46	47	46	47	47	47	47	47	47	46	46	46	45	45	44
Thu	44	44	44	43	43	43	42	42	42	42	42	41	41	41	40	41	41	43	44	45	44	42	40	40
Fri	41	41	41	42	42	43	43	43	44	44	44	44	44	44	43	43	44	43	43	43	43	43	42	42
Sat	41	41	41	41	40	40	40	40	40	40	40	40	40	40	41	40	40	41	41	41	41	41	40	40
Sun	39	39	39	39	39	39	39	39	39	39	38	38	38	38	38	38	38	38	38	38	37	37	37	37
Mon	37	37	36	36	36	35	35	35	34	34	34	34	34	34	34	34	35	35	35	35	35	34	34	33
Tue	33	33	34	34	33	34	34	34	34	34	34	34	34	35	35	36	37	38	39	39	39	39	38	38

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	49	48	48	47	47	47	47	47	46	46	47	46	47	47	47	47	47	47	46	46	46	45	45	44
Thu	44	44	44	43	43	43	42	42	42	42	42	41	41	41	40	41	41	43	44	45	44	42	40	40
Fri	41	41	41	42	42	43	43	43	44	44	44	44	44	44	43	43	44	43	43	43	43	43	42	42
Sat	41	41	41	41	40	40	40	40	40	40	40	40	40	40	41	40	40	41	41	41	41	41	40	40
Sun	39	39	39	39	39	39	39	39	39	39	38	38	38	38	38	38	38	38	38	38	37	37	37	37
Mon	37	37	36	36	36	35	35	35	34	34	34	34	34	34	34	34	35	35	35	35	35	34	34	33
Tue	33	33	34	34	33	34	34	34	34	34	34	34	34	35	35	36	37	38	39	39	39	39	38	38