23 – 29 Jul 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

42.6Weekly mean modelled AQI · Good

Mean PM2.5: 8.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-2.1 AQI compared with the previous week’s mean of 44.7.

Highest hourly estimate: 61 in Chiang Mai · 23 Jul, 00:00 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, 23 Jul	38.1Good	18–61	6.4	192 / 192
Thu, 24 Jul	35.6Good	19–53	7.5	192 / 192
Fri, 25 Jul	45.5Good	25–56	9.3	192 / 192
Sat, 26 Jul	48.6Good	37–57	9.2	192 / 192
Sun, 27 Jul	44.2Good	22–55	7.8	192 / 192
Mon, 28 Jul	42.8Good	22–54	8.2	192 / 192
Tue, 29 Jul	43.3Good	20–57	8.2	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	39	39	38	38	38	38	38	38	38	38	37	37	37	37	38	38	39	39	39	39	39	39	38	37
Thu	36	35	35	34	33	33	33	33	33	33	33	34	34	35	35	36	37	37	38	39	40	40	40	40
Fri	41	41	42	43	43	44	45	46	46	47	47	47	47	47	47	47	47	47	47	47	47	47	47	48
Sat	48	48	48	48	48	48	48	47	48	49	49	49	49	49	49	49	49	49	49	49	49	49	49	49
Sun	48	48	48	48	48	48	48	47	46	46	45	44	43	43	42	42	41	41	41	41	41	41	41	41
Mon	41	41	42	42	42	42	42	42	42	42	43	43	43	43	43	44	44	44	44	43	44	44	45	45
Tue	45	45	44	44	43	43	43	42	43	43	43	43	43	43	43	43	43	43	43	44	44	44	44	43

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	53.4Moderate	57	11	168 / 168
Phuket	49.9Good	55	9.3	168 / 168
Chiang Mai	45.7Good	61	8.6	168 / 168
Chiang Rai	41.2Good	54	7.6	168 / 168
Bangkok	41.1Good	56	7.8	168 / 168
Khon Kaen	40.2Good	53	7.6	168 / 168
Nakhon Ratchasima	38Good	57	7.2	168 / 168
Pattaya	31.1Good	50	5.5	168 / 168

City-hours by category

Good: 854

Moderate: 490

Unhealthy for Sensitive Groups: 0

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	39	39	38	38	38	38	38	38	38	38	37	37	37	37	38	38	39	39	39	39	39	39	38	37
Thu	36	35	35	34	33	33	33	33	33	33	33	34	34	35	35	36	37	37	38	39	40	40	40	40
Fri	41	41	42	43	43	44	45	46	46	47	47	47	47	47	47	47	47	47	47	47	47	47	47	48
Sat	48	48	48	48	48	48	48	47	48	49	49	49	49	49	49	49	49	49	49	49	49	49	49	49
Sun	48	48	48	48	48	48	48	47	46	46	45	44	43	43	42	42	41	41	41	41	41	41	41	41
Mon	41	41	42	42	42	42	42	42	42	42	43	43	43	43	43	44	44	44	44	43	44	44	45	45
Tue	45	45	44	44	43	43	43	42	43	43	43	43	43	43	43	43	43	43	43	44	44	44	44	43

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	39	39	38	38	38	38	38	38	38	38	37	37	37	37	38	38	39	39	39	39	39	39	38	37
Thu	36	35	35	34	33	33	33	33	33	33	33	34	34	35	35	36	37	37	38	39	40	40	40	40
Fri	41	41	42	43	43	44	45	46	46	47	47	47	47	47	47	47	47	47	47	47	47	47	47	48
Sat	48	48	48	48	48	48	48	47	48	49	49	49	49	49	49	49	49	49	49	49	49	49	49	49
Sun	48	48	48	48	48	48	48	47	46	46	45	44	43	43	42	42	41	41	41	41	41	41	41	41
Mon	41	41	42	42	42	42	42	42	42	42	43	43	43	43	43	44	44	44	44	43	44	44	45	45
Tue	45	45	44	44	43	43	43	42	43	43	43	43	43	43	43	43	43	43	43	44	44	44	44	43

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	39	39	38	38	38	38	38	38	38	38	37	37	37	37	38	38	39	39	39	39	39	39	38	37
Thu	36	35	35	34	33	33	33	33	33	33	33	34	34	35	35	36	37	37	38	39	40	40	40	40
Fri	41	41	42	43	43	44	45	46	46	47	47	47	47	47	47	47	47	47	47	47	47	47	47	48
Sat	48	48	48	48	48	48	48	47	48	49	49	49	49	49	49	49	49	49	49	49	49	49	49	49
Sun	48	48	48	48	48	48	48	47	46	46	45	44	43	43	42	42	41	41	41	41	41	41	41	41
Mon	41	41	42	42	42	42	42	42	42	42	43	43	43	43	43	44	44	44	44	43	44	44	45	45
Tue	45	45	44	44	43	43	43	42	43	43	43	43	43	43	43	43	43	43	43	44	44	44	44	43