19 – 25 Nov 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

54.2Weekly mean modelled AQI · Moderate

Mean PM2.5: 12.2 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-5.6 AQI compared with the previous week’s mean of 59.8.

Highest hourly estimate: 165 in Pattaya · 23 Nov, 20:00 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, 19 Nov	44.1Good	20–74	7	192 / 192
Thu, 20 Nov	41.1Good	24–74	8.8	192 / 192
Fri, 21 Nov	51.1Moderate	30–78	12	192 / 192
Sat, 22 Nov	56.3Moderate	29–151	11.8	192 / 192
Sun, 23 Nov	63.6Moderate	34–165	15.6	192 / 192
Mon, 24 Nov	61.9Moderate	30–113	13.8	192 / 192
Tue, 25 Nov	61.2Moderate	24–129	16.3	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	47	46	46	46	46	46	45	45	45	45	45	45	45	45	44	44	44	43	42	42	42	41	40	40
Thu	39	39	38	38	38	38	38	38	38	38	38	39	39	40	41	42	43	44	46	48	48	47	47	47
Fri	47	47	48	48	48	49	49	49	50	50	51	51	51	52	52	53	53	54	54	55	54	54	54	54
Sat	55	55	55	55	55	55	54	54	54	53	53	53	52	52	52	53	58	64	68	68	66	62	57	54
Sun	53	53	54	55	56	57	58	59	59	60	60	60	60	59	59	62	69	76	80	81	80	77	72	69
Mon	66	63	61	61	61	61	62	62	62	62	62	62	62	61	60	60	60	65	67	66	64	60	58	58
Tue	58	57	57	57	57	57	57	59	59	58	58	58	58	59	60	61	66	70	73	72	69	65	63	62

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	80.7Moderate	157	23.3	168 / 168
Chiang Mai	64.9Moderate	80	16.3	168 / 168
Pattaya	59.7Moderate	165	12.2	168 / 168
Khon Kaen	58.5Moderate	85	14.4	168 / 168
Nakhon Ratchasima	53.8Moderate	88	12.3	168 / 168
Phuket	43.3Good	73	7.1	168 / 168
Chiang Rai	38Good	53	6.7	168 / 168
Hat Yai	34.4Good	44	5	168 / 168

City-hours by category

Good: 572

Moderate: 744

Unhealthy for Sensitive Groups: 20

Unhealthy: 8

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	47	46	46	46	46	46	45	45	45	45	45	45	45	45	44	44	44	43	42	42	42	41	40	40
Thu	39	39	38	38	38	38	38	38	38	38	38	39	39	40	41	42	43	44	46	48	48	47	47	47
Fri	47	47	48	48	48	49	49	49	50	50	51	51	51	52	52	53	53	54	54	55	54	54	54	54
Sat	55	55	55	55	55	55	54	54	54	53	53	53	52	52	52	53	58	64	68	68	66	62	57	54
Sun	53	53	54	55	56	57	58	59	59	60	60	60	60	59	59	62	69	76	80	81	80	77	72	69
Mon	66	63	61	61	61	61	62	62	62	62	62	62	62	61	60	60	60	65	67	66	64	60	58	58
Tue	58	57	57	57	57	57	57	59	59	58	58	58	58	59	60	61	66	70	73	72	69	65	63	62

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	47	46	46	46	46	46	45	45	45	45	45	45	45	45	44	44	44	43	42	42	42	41	40	40
Thu	39	39	38	38	38	38	38	38	38	38	38	39	39	40	41	42	43	44	46	48	48	47	47	47
Fri	47	47	48	48	48	49	49	49	50	50	51	51	51	52	52	53	53	54	54	55	54	54	54	54
Sat	55	55	55	55	55	55	54	54	54	53	53	53	52	52	52	53	58	64	68	68	66	62	57	54
Sun	53	53	54	55	56	57	58	59	59	60	60	60	60	59	59	62	69	76	80	81	80	77	72	69
Mon	66	63	61	61	61	61	62	62	62	62	62	62	62	61	60	60	60	65	67	66	64	60	58	58
Tue	58	57	57	57	57	57	57	59	59	58	58	58	58	59	60	61	66	70	73	72	69	65	63	62

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	47	46	46	46	46	46	45	45	45	45	45	45	45	45	44	44	44	43	42	42	42	41	40	40
Thu	39	39	38	38	38	38	38	38	38	38	38	39	39	40	41	42	43	44	46	48	48	47	47	47
Fri	47	47	48	48	48	49	49	49	50	50	51	51	51	52	52	53	53	54	54	55	54	54	54	54
Sat	55	55	55	55	55	55	54	54	54	53	53	53	52	52	52	53	58	64	68	68	66	62	57	54
Sun	53	53	54	55	56	57	58	59	59	60	60	60	60	59	59	62	69	76	80	81	80	77	72	69
Mon	66	63	61	61	61	61	62	62	62	62	62	62	62	61	60	60	60	65	67	66	64	60	58	58
Tue	58	57	57	57	57	57	57	59	59	58	58	58	58	59	60	61	66	70	73	72	69	65	63	62