30 Sep – 6 Oct 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

57.4Weekly mean modelled AQI · Moderate

Mean PM2.5: 12.5 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+17.1 AQI compared with the previous week’s mean of 40.3.

Highest hourly estimate: 156 in Khon Kaen · 2 Oct, 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, 30 Sep	57.1Moderate	35–111	15.1	192 / 192
Thu, 1 Oct	63Moderate	42–146	13.4	192 / 192
Fri, 2 Oct	65.7Moderate	33–156	17.2	192 / 192
Sat, 3 Oct	60.8Moderate	26–101	10.6	192 / 192
Sun, 4 Oct	52.5Moderate	27–134	9.7	192 / 192
Mon, 5 Oct	50.8Moderate	26–115	11	192 / 192
Tue, 6 Oct	51.5Moderate	28–105	10.3	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	50	50	51	52	53	53	54	55	55	55	56	56	57	58	58	59	62	66	65	64	61	61	61	61
Thu	61	62	62	62	62	62	63	63	62	62	61	61	60	59	58	58	64	73	78	76	68	62	58	58
Fri	57	57	56	56	56	55	55	54	57	59	60	61	62	63	64	72	79	89	92	89	82	73	65	65
Sat	64	64	64	64	64	64	64	64	63	62	61	61	60	59	58	57	60	64	66	64	57	53	51	50
Sun	50	49	49	49	49	49	48	48	48	48	48	48	48	48	48	52	62	70	72	69	62	54	50	48
Mon	48	48	48	48	48	48	47	47	47	47	47	47	47	48	48	49	57	65	67	64	57	52	50	50
Tue	50	50	50	50	50	51	51	51	51	50	50	50	50	50	50	51	53	57	60	59	53	51	50	48

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
Bangkok	82.3Moderate	146	23.1	168 / 168
Chiang Mai	65Moderate	103	16.8	168 / 168
Pattaya	61.2Moderate	130	12.6	168 / 168
Khon Kaen	58.7Moderate	156	11.2	168 / 168
Nakhon Ratchasima	57Moderate	91	11.4	168 / 168
Chiang Rai	49Good	74	9.3	168 / 168
Hat Yai	46.1Good	74	8.2	168 / 168
Phuket	39.6Good	56	7.1	168 / 168

City-hours by category

Good: 399

Moderate: 909

Unhealthy for Sensitive Groups: 34

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	50	50	51	52	53	53	54	55	55	55	56	56	57	58	58	59	62	66	65	64	61	61	61	61
Thu	61	62	62	62	62	62	63	63	62	62	61	61	60	59	58	58	64	73	78	76	68	62	58	58
Fri	57	57	56	56	56	55	55	54	57	59	60	61	62	63	64	72	79	89	92	89	82	73	65	65
Sat	64	64	64	64	64	64	64	64	63	62	61	61	60	59	58	57	60	64	66	64	57	53	51	50
Sun	50	49	49	49	49	49	48	48	48	48	48	48	48	48	48	52	62	70	72	69	62	54	50	48
Mon	48	48	48	48	48	48	47	47	47	47	47	47	47	48	48	49	57	65	67	64	57	52	50	50
Tue	50	50	50	50	50	51	51	51	51	50	50	50	50	50	50	51	53	57	60	59	53	51	50	48

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	50	50	51	52	53	53	54	55	55	55	56	56	57	58	58	59	62	66	65	64	61	61	61	61
Thu	61	62	62	62	62	62	63	63	62	62	61	61	60	59	58	58	64	73	78	76	68	62	58	58
Fri	57	57	56	56	56	55	55	54	57	59	60	61	62	63	64	72	79	89	92	89	82	73	65	65
Sat	64	64	64	64	64	64	64	64	63	62	61	61	60	59	58	57	60	64	66	64	57	53	51	50
Sun	50	49	49	49	49	49	48	48	48	48	48	48	48	48	48	52	62	70	72	69	62	54	50	48
Mon	48	48	48	48	48	48	47	47	47	47	47	47	47	48	48	49	57	65	67	64	57	52	50	50
Tue	50	50	50	50	50	51	51	51	51	50	50	50	50	50	50	51	53	57	60	59	53	51	50	48

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	50	50	51	52	53	53	54	55	55	55	56	56	57	58	58	59	62	66	65	64	61	61	61	61
Thu	61	62	62	62	62	62	63	63	62	62	61	61	60	59	58	58	64	73	78	76	68	62	58	58
Fri	57	57	56	56	56	55	55	54	57	59	60	61	62	63	64	72	79	89	92	89	82	73	65	65
Sat	64	64	64	64	64	64	64	64	63	62	61	61	60	59	58	57	60	64	66	64	57	53	51	50
Sun	50	49	49	49	49	49	48	48	48	48	48	48	48	48	48	52	62	70	72	69	62	54	50	48
Mon	48	48	48	48	48	48	47	47	47	47	47	47	47	48	48	49	57	65	67	64	57	52	50	50
Tue	50	50	50	50	50	51	51	51	51	50	50	50	50	50	50	51	53	57	60	59	53	51	50	48