1 – 7 Oct 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

48.7Weekly mean modelled AQI · Good

Mean PM2.5: 10.2 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+11.7 AQI compared with the previous week’s mean of 37.

Highest hourly estimate: 207 in Bangkok · 2 Oct, 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, 1 Oct	36.2Good	19–56	7.8	192 / 192
Thu, 2 Oct	54.6Moderate	25–207	12.4	192 / 192
Fri, 3 Oct	59.1Moderate	27–202	12.6	192 / 192
Sat, 4 Oct	50.7Moderate	28–136	8.6	192 / 192
Sun, 5 Oct	43.7Good	20–63	8.8	192 / 192
Mon, 6 Oct	47.2Good	28–60	9.6	192 / 192
Tue, 7 Oct	49.4Good	28–71	11.2	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	32	32	32	33	33	34	34	35	35	35	35	36	36	36	37	37	38	40	40	40	39	40	40	41
Thu	42	43	44	45	45	45	45	46	47	47	48	48	49	49	50	58	62	70	75	76	75	72	68	62
Fri	56	53	53	53	53	53	54	54	54	54	55	55	55	55	56	57	65	69	72	72	72	70	68	64
Sat	61	58	57	56	54	54	53	53	52	52	51	50	50	49	48	47	47	48	49	49	47	46	45	44
Sun	44	43	43	42	42	42	42	42	42	42	42	42	42	43	43	44	46	47	47	47	46	46	46	45
Mon	45	45	46	46	46	47	47	47	47	48	48	48	48	48	48	48	48	48	48	47	47	48	47	48
Tue	48	48	48	48	48	48	47	47	48	48	49	49	49	50	50	51	51	51	52	52	52	52	52	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
Bangkok	73.2Moderate	207	17.6	168 / 168
Chiang Mai	55Moderate	71	13.5	168 / 168
Khon Kaen	51.1Moderate	67	10.5	168 / 168
Nakhon Ratchasima	50.2Moderate	59	11.1	168 / 168
Pattaya	42.1Good	88	7.8	168 / 168
Hat Yai	40.9Good	56	7.1	168 / 168
Phuket	39.6Good	102	6.6	168 / 168
Chiang Rai	37.4Good	54	7.1	168 / 168

City-hours by category

Good: 705

Moderate: 605

Unhealthy for Sensitive Groups: 20

Unhealthy: 9

Very Unhealthy: 5

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	32	32	32	33	33	34	34	35	35	35	35	36	36	36	37	37	38	40	40	40	39	40	40	41
Thu	42	43	44	45	45	45	45	46	47	47	48	48	49	49	50	58	62	70	75	76	75	72	68	62
Fri	56	53	53	53	53	53	54	54	54	54	55	55	55	55	56	57	65	69	72	72	72	70	68	64
Sat	61	58	57	56	54	54	53	53	52	52	51	50	50	49	48	47	47	48	49	49	47	46	45	44
Sun	44	43	43	42	42	42	42	42	42	42	42	42	42	43	43	44	46	47	47	47	46	46	46	45
Mon	45	45	46	46	46	47	47	47	47	48	48	48	48	48	48	48	48	48	48	47	47	48	47	48
Tue	48	48	48	48	48	48	47	47	48	48	49	49	49	50	50	51	51	51	52	52	52	52	52	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	32	32	32	33	33	34	34	35	35	35	35	36	36	36	37	37	38	40	40	40	39	40	40	41
Thu	42	43	44	45	45	45	45	46	47	47	48	48	49	49	50	58	62	70	75	76	75	72	68	62
Fri	56	53	53	53	53	53	54	54	54	54	55	55	55	55	56	57	65	69	72	72	72	70	68	64
Sat	61	58	57	56	54	54	53	53	52	52	51	50	50	49	48	47	47	48	49	49	47	46	45	44
Sun	44	43	43	42	42	42	42	42	42	42	42	42	42	43	43	44	46	47	47	47	46	46	46	45
Mon	45	45	46	46	46	47	47	47	47	48	48	48	48	48	48	48	48	48	48	47	47	48	47	48
Tue	48	48	48	48	48	48	47	47	48	48	49	49	49	50	50	51	51	51	52	52	52	52	52	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	32	32	32	33	33	34	34	35	35	35	35	36	36	36	37	37	38	40	40	40	39	40	40	41
Thu	42	43	44	45	45	45	45	46	47	47	48	48	49	49	50	58	62	70	75	76	75	72	68	62
Fri	56	53	53	53	53	53	54	54	54	54	55	55	55	55	56	57	65	69	72	72	72	70	68	64
Sat	61	58	57	56	54	54	53	53	52	52	51	50	50	49	48	47	47	48	49	49	47	46	45	44
Sun	44	43	43	42	42	42	42	42	42	42	42	42	42	43	43	44	46	47	47	47	46	46	46	45
Mon	45	45	46	46	46	47	47	47	47	48	48	48	48	48	48	48	48	48	48	47	47	48	47	48
Tue	48	48	48	48	48	48	47	47	48	48	49	49	49	50	50	51	51	51	52	52	52	52	52	52