22 – 28 Oct 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

56.8Weekly mean modelled AQI · Moderate

Mean PM2.5: 13.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+3.7 AQI compared with the previous week’s mean of 53.1.

Highest hourly estimate: 155 in Bangkok · 24 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, 22 Oct	56.9Moderate	19–146	13.3	192 / 192
Thu, 23 Oct	54.5Moderate	18–103	11.3	192 / 192
Fri, 24 Oct	54.2Moderate	32–155	11.8	192 / 192
Sat, 25 Oct	53.3Moderate	25–133	11.3	192 / 192
Sun, 26 Oct	53.8Moderate	19–106	14.8	192 / 192
Mon, 27 Oct	61.8Moderate	42–87	16.4	192 / 192
Tue, 28 Oct	63.2Moderate	37–120	15.3	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	57	57	57	57	57	56	57	56	57	56	56	56	56	56	55	55	58	61	62	62	59	56	55	55
Thu	55	54	54	54	53	53	53	53	53	53	53	54	54	54	55	56	56	59	60	58	56	54	54	53
Fri	53	53	52	52	52	52	51	51	51	51	51	51	51	52	52	53	58	62	64	64	61	58	53	53
Sat	53	53	54	53	53	53	53	53	53	52	52	51	51	51	51	52	57	60	61	60	56	51	49	48
Sun	48	47	47	47	48	48	49	49	50	51	53	53	54	55	56	57	58	61	62	61	59	59	59	60
Mon	60	60	61	61	61	61	62	62	62	62	62	62	62	62	62	62	63	63	63	63	63	63	63	63
Tue	63	64	64	64	64	63	63	63	63	63	63	63	63	63	62	62	63	65	67	66	64	61	61	61

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	89.6Moderate	155	27	168 / 168
Chiang Mai	73.1Moderate	87	21.1	168 / 168
Khon Kaen	60Moderate	79	14.4	168 / 168
Nakhon Ratchasima	56.1Moderate	69	12.4	168 / 168
Pattaya	55Moderate	71	11.4	168 / 168
Chiang Rai	49.9Good	62	9.6	168 / 168
Hat Yai	36.1Good	55	6.6	168 / 168
Phuket	34.9Good	49	5	168 / 168

City-hours by category

Good: 457

Moderate: 864

Unhealthy for Sensitive Groups: 21

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	57	57	57	57	57	56	57	56	57	56	56	56	56	56	55	55	58	61	62	62	59	56	55	55
Thu	55	54	54	54	53	53	53	53	53	53	53	54	54	54	55	56	56	59	60	58	56	54	54	53
Fri	53	53	52	52	52	52	51	51	51	51	51	51	51	52	52	53	58	62	64	64	61	58	53	53
Sat	53	53	54	53	53	53	53	53	53	52	52	51	51	51	51	52	57	60	61	60	56	51	49	48
Sun	48	47	47	47	48	48	49	49	50	51	53	53	54	55	56	57	58	61	62	61	59	59	59	60
Mon	60	60	61	61	61	61	62	62	62	62	62	62	62	62	62	62	63	63	63	63	63	63	63	63
Tue	63	64	64	64	64	63	63	63	63	63	63	63	63	63	62	62	63	65	67	66	64	61	61	61

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	57	57	57	57	57	56	57	56	57	56	56	56	56	56	55	55	58	61	62	62	59	56	55	55
Thu	55	54	54	54	53	53	53	53	53	53	53	54	54	54	55	56	56	59	60	58	56	54	54	53
Fri	53	53	52	52	52	52	51	51	51	51	51	51	51	52	52	53	58	62	64	64	61	58	53	53
Sat	53	53	54	53	53	53	53	53	53	52	52	51	51	51	51	52	57	60	61	60	56	51	49	48
Sun	48	47	47	47	48	48	49	49	50	51	53	53	54	55	56	57	58	61	62	61	59	59	59	60
Mon	60	60	61	61	61	61	62	62	62	62	62	62	62	62	62	62	63	63	63	63	63	63	63	63
Tue	63	64	64	64	64	63	63	63	63	63	63	63	63	63	62	62	63	65	67	66	64	61	61	61

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	57	57	57	57	57	56	57	56	57	56	56	56	56	56	55	55	58	61	62	62	59	56	55	55
Thu	55	54	54	54	53	53	53	53	53	53	53	54	54	54	55	56	56	59	60	58	56	54	54	53
Fri	53	53	52	52	52	52	51	51	51	51	51	51	51	52	52	53	58	62	64	64	61	58	53	53
Sat	53	53	54	53	53	53	53	53	53	52	52	51	51	51	51	52	57	60	61	60	56	51	49	48
Sun	48	47	47	47	48	48	49	49	50	51	53	53	54	55	56	57	58	61	62	61	59	59	59	60
Mon	60	60	61	61	61	61	62	62	62	62	62	62	62	62	62	62	63	63	63	63	63	63	63	63
Tue	63	64	64	64	64	63	63	63	63	63	63	63	63	63	62	62	63	65	67	66	64	61	61	61