2 – 8 Sep 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

43.9Weekly 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.

+4.1 AQI compared with the previous week’s mean of 39.8.

Highest hourly estimate: 78 in Khon Kaen · 5 Sept, 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, 2 Sep	48.5Good	23–63	9.9	192 / 192
Thu, 3 Sep	44.8Good	20–62	8.5	192 / 192
Fri, 4 Sep	44.9Good	20–64	10.2	192 / 192
Sat, 5 Sep	47.2Good	26–78	9.4	192 / 192
Sun, 6 Sep	46Good	24–69	8	192 / 192
Mon, 7 Sep	38.3Good	19–61	6.7	192 / 192
Tue, 8 Sep	37.5Good	21–52	5.9	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	46	46	46	46	47	47	47	48	48	49	49	49	49	50	50	50	50	51	50	50	50	50	49	49
Thu	49	49	49	49	48	48	47	47	46	45	45	44	44	43	43	42	42	43	43	43	42	42	42	43
Fri	43	43	43	43	43	43	43	43	44	44	44	44	45	45	45	46	46	47	47	47	47	47	47	47
Sat	47	47	47	47	47	47	47	47	47	47	47	46	46	46	46	47	48	50	51	50	48	48	47	46
Sun	47	47	47	47	47	47	47	47	47	47	47	47	46	46	46	45	45	46	47	46	45	44	43	43
Mon	42	41	40	40	39	38	38	37	37	37	37	37	37	37	37	37	37	38	39	39	38	39	39	39
Tue	39	39	38	38	38	38	38	38	37	37	37	36	36	36	37	37	38	39	39	39	39	38	37	36

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	56.6Moderate	63	12.3	168 / 168
Bangkok	52.9Moderate	69	11.4	168 / 168
Khon Kaen	50.6Moderate	78	9.8	168 / 168
Nakhon Ratchasima	46.3Good	58	8.3	168 / 168
Chiang Rai	42.8Good	52	7.5	168 / 168
Phuket	36.6Good	56	6.4	168 / 168
Hat Yai	34.1Good	57	6	168 / 168
Pattaya	31.2Good	50	5.2	168 / 168

City-hours by category

Good: 870

Moderate: 474

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

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

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