21 – 27 Oct 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

57.7Weekly mean modelled AQI · Moderate

Mean PM2.5: 11.3 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-3.3 AQI compared with the previous week’s mean of 61.

Highest hourly estimate: 248 in Bangkok · 23 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, 21 Oct	56.8Moderate	33–164	11.4	192 / 192
Thu, 22 Oct	66.7Moderate	40–218	15.7	192 / 192
Fri, 23 Oct	72.6Moderate	29–248	13.7	192 / 192
Sat, 24 Oct	55.9Moderate	23–183	8.7	192 / 192
Sun, 25 Oct	48.4Good	22–108	9.3	192 / 192
Mon, 26 Oct	51.2Moderate	21–156	8.6	192 / 192
Tue, 27 Oct	52.6Moderate	16–169	11.7	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	50	50	50	50	51	51	51	52	52	52	52	52	52	52	52	53	62	73	79	78	72	66	59	55
Thu	53	53	53	53	53	53	53	52	53	54	54	55	56	61	63	68	84	96	101	99	94	87	80	71
Fri	63	62	62	62	62	63	63	63	62	62	61	61	60	64	68	75	88	99	103	100	92	87	84	79
Sat	72	64	56	55	55	54	54	53	53	53	53	53	52	52	52	53	59	68	69	63	55	50	48	47
Sun	46	46	45	45	45	45	44	44	44	45	45	45	45	46	46	47	54	62	64	60	55	51	48	46
Mon	47	47	47	47	47	47	47	47	47	46	46	46	46	46	45	50	59	67	70	67	61	57	53	49
Tue	45	45	45	45	45	45	45	45	46	47	48	48	49	50	51	57	65	71	72	69	65	59	54	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	98.6Moderate	248	22.5	168 / 168
Chiang Mai	71.2Moderate	137	16.1	168 / 168
Pattaya	63.9Moderate	175	12.4	168 / 168
Chiang Rai	52.9Moderate	102	9.4	168 / 168
Nakhon Ratchasima	52Moderate	64	10.5	168 / 168
Khon Kaen	51.8Moderate	87	9.9	168 / 168
Hat Yai	36.7Good	69	5.5	168 / 168
Phuket	34.8Good	90	4.1	168 / 168

City-hours by category

Good: 579

Moderate: 669

Unhealthy for Sensitive Groups: 63

Unhealthy: 20

Very Unhealthy: 13

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	50	50	51	51	51	52	52	52	52	52	52	52	52	53	62	73	79	78	72	66	59	55
Thu	53	53	53	53	53	53	53	52	53	54	54	55	56	61	63	68	84	96	101	99	94	87	80	71
Fri	63	62	62	62	62	63	63	63	62	62	61	61	60	64	68	75	88	99	103	100	92	87	84	79
Sat	72	64	56	55	55	54	54	53	53	53	53	53	52	52	52	53	59	68	69	63	55	50	48	47
Sun	46	46	45	45	45	45	44	44	44	45	45	45	45	46	46	47	54	62	64	60	55	51	48	46
Mon	47	47	47	47	47	47	47	47	47	46	46	46	46	46	45	50	59	67	70	67	61	57	53	49
Tue	45	45	45	45	45	45	45	45	46	47	48	48	49	50	51	57	65	71	72	69	65	59	54	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	50	50	50	50	51	51	51	52	52	52	52	52	52	52	52	53	62	73	79	78	72	66	59	55
Thu	53	53	53	53	53	53	53	52	53	54	54	55	56	61	63	68	84	96	101	99	94	87	80	71
Fri	63	62	62	62	62	63	63	63	62	62	61	61	60	64	68	75	88	99	103	100	92	87	84	79
Sat	72	64	56	55	55	54	54	53	53	53	53	53	52	52	52	53	59	68	69	63	55	50	48	47
Sun	46	46	45	45	45	45	44	44	44	45	45	45	45	46	46	47	54	62	64	60	55	51	48	46
Mon	47	47	47	47	47	47	47	47	47	46	46	46	46	46	45	50	59	67	70	67	61	57	53	49
Tue	45	45	45	45	45	45	45	45	46	47	48	48	49	50	51	57	65	71	72	69	65	59	54	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	50	50	50	50	51	51	51	52	52	52	52	52	52	52	52	53	62	73	79	78	72	66	59	55
Thu	53	53	53	53	53	53	53	52	53	54	54	55	56	61	63	68	84	96	101	99	94	87	80	71
Fri	63	62	62	62	62	63	63	63	62	62	61	61	60	64	68	75	88	99	103	100	92	87	84	79
Sat	72	64	56	55	55	54	54	53	53	53	53	53	52	52	52	53	59	68	69	63	55	50	48	47
Sun	46	46	45	45	45	45	44	44	44	45	45	45	45	46	46	47	54	62	64	60	55	51	48	46
Mon	47	47	47	47	47	47	47	47	47	46	46	46	46	46	45	50	59	67	70	67	61	57	53	49
Tue	45	45	45	45	45	45	45	45	46	47	48	48	49	50	51	57	65	71	72	69	65	59	54	52