13 – 19 Aug 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

49.3Weekly mean modelled AQI · Good

Mean PM2.5: 10.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-0.7 AQI compared with the previous week’s mean of 50.

Highest hourly estimate: 108 in Hat Yai · 18 Aug, 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, 13 Aug	47.2Good	19–58	10.3	192 / 192
Thu, 14 Aug	51.1Moderate	20–63	10.1	192 / 192
Fri, 15 Aug	48.1Good	22–66	9.3	192 / 192
Sat, 16 Aug	43.6Good	18–60	7.7	192 / 192
Sun, 17 Aug	44.5Good	17–74	9.4	192 / 192
Mon, 18 Aug	53.7Moderate	17–108	13.6	192 / 192
Tue, 19 Aug	57.1Moderate	29–98	12.3	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	47	47	47	46	46	46	46	46	47	47	47	47	47	47	47	48	48	48	48	48	49	50	50
Thu	50	51	51	51	51	51	51	52	51	51	51	51	52	52	52	52	52	52	51	51	51	50	50	50
Fri	50	49	49	49	49	49	49	48	48	48	48	48	48	48	48	48	48	47	48	48	48	48	47	47
Sat	47	46	46	45	45	44	44	43	43	43	43	43	43	43	43	43	43	43	43	43	43	43	43	43
Sun	43	43	43	43	43	43	43	43	43	43	43	43	44	44	44	45	45	47	48	48	48	47	48	48
Mon	48	48	49	49	49	50	50	50	51	52	52	53	54	54	55	55	58	60	61	61	60	58	57	57
Tue	58	58	58	58	58	58	58	58	58	58	57	57	57	56	56	56	57	58	58	58	56	55	55	54

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
Hat Yai	56.8Moderate	108	13.3	168 / 168
Chiang Mai	55Moderate	66	12.6	168 / 168
Khon Kaen	53.4Moderate	61	11.4	168 / 168
Phuket	53.3Moderate	66	10.9	168 / 168
Bangkok	50.9Moderate	58	10.5	168 / 168
Chiang Rai	50.6Moderate	64	10.4	168 / 168
Nakhon Ratchasima	50Good	59	10	168 / 168
Pattaya	24.6Good	43	3.9	168 / 168

City-hours by category

Good: 526

Moderate: 815

Unhealthy for Sensitive Groups: 3

Unhealthy: 0

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	47	47	47	46	46	46	46	46	47	47	47	47	47	47	47	48	48	48	48	48	49	50	50
Thu	50	51	51	51	51	51	51	52	51	51	51	51	52	52	52	52	52	52	51	51	51	50	50	50
Fri	50	49	49	49	49	49	49	48	48	48	48	48	48	48	48	48	48	47	48	48	48	48	47	47
Sat	47	46	46	45	45	44	44	43	43	43	43	43	43	43	43	43	43	43	43	43	43	43	43	43
Sun	43	43	43	43	43	43	43	43	43	43	43	43	44	44	44	45	45	47	48	48	48	47	48	48
Mon	48	48	49	49	49	50	50	50	51	52	52	53	54	54	55	55	58	60	61	61	60	58	57	57
Tue	58	58	58	58	58	58	58	58	58	58	57	57	57	56	56	56	57	58	58	58	56	55	55	54

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	47	47	47	46	46	46	46	46	47	47	47	47	47	47	47	48	48	48	48	48	49	50	50
Thu	50	51	51	51	51	51	51	52	51	51	51	51	52	52	52	52	52	52	51	51	51	50	50	50
Fri	50	49	49	49	49	49	49	48	48	48	48	48	48	48	48	48	48	47	48	48	48	48	47	47
Sat	47	46	46	45	45	44	44	43	43	43	43	43	43	43	43	43	43	43	43	43	43	43	43	43
Sun	43	43	43	43	43	43	43	43	43	43	43	43	44	44	44	45	45	47	48	48	48	47	48	48
Mon	48	48	49	49	49	50	50	50	51	52	52	53	54	54	55	55	58	60	61	61	60	58	57	57
Tue	58	58	58	58	58	58	58	58	58	58	57	57	57	56	56	56	57	58	58	58	56	55	55	54

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	47	47	47	46	46	46	46	46	47	47	47	47	47	47	47	48	48	48	48	48	49	50	50
Thu	50	51	51	51	51	51	51	52	51	51	51	51	52	52	52	52	52	52	51	51	51	50	50	50
Fri	50	49	49	49	49	49	49	48	48	48	48	48	48	48	48	48	48	47	48	48	48	48	47	47
Sat	47	46	46	45	45	44	44	43	43	43	43	43	43	43	43	43	43	43	43	43	43	43	43	43
Sun	43	43	43	43	43	43	43	43	43	43	43	43	44	44	44	45	45	47	48	48	48	47	48	48
Mon	48	48	49	49	49	50	50	50	51	52	52	53	54	54	55	55	58	60	61	61	60	58	57	57
Tue	58	58	58	58	58	58	58	58	58	58	57	57	57	56	56	56	57	58	58	58	56	55	55	54