16 – 22 Jul 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

44.7Weekly mean modelled AQI · Good

Mean PM2.5: 8.8 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-9.3 AQI compared with the previous week’s mean of 54.

Highest hourly estimate: 75 in Hat Yai · 17 Jul, 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, 16 Jul	48.2Good	24–72	9.4	192 / 192
Thu, 17 Jul	47.3Good	23–75	9.7	192 / 192
Fri, 18 Jul	47.5Good	18–63	9.3	192 / 192
Sat, 19 Jul	48.1Good	18–67	10.3	192 / 192
Sun, 20 Jul	43.8Good	18–66	7.7	192 / 192
Mon, 21 Jul	38.3Good	19–65	7.1	192 / 192
Tue, 22 Jul	39.5Good	17–65	7.8	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	52	51	51	50	49	49	49	48	48	48	47	47	47	47	47	47	48	47	48	48	48	47	47	47
Thu	47	46	46	46	47	47	47	47	47	47	47	47	46	47	47	47	47	48	49	50	49	48	48	48
Fri	48	48	48	48	47	47	47	47	48	48	48	48	48	48	48	48	48	48	48	48	48	47	47	47
Sat	47	46	47	46	47	46	46	46	47	47	48	48	49	49	49	50	50	50	50	50	50	49	49	48
Sun	48	48	47	47	47	47	46	46	45	44	44	43	43	42	42	42	42	42	42	42	42	42	41	41
Mon	40	40	39	39	38	38	37	37	37	37	37	37	37	37	37	38	38	39	39	39	40	40	40	39
Tue	39	39	39	39	39	39	39	39	39	39	39	39	39	39	39	40	40	41	41	41	41	41	40	40

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
Chiang Mai	60.6Moderate	72	14.2	168 / 168
Chiang Rai	54.3Moderate	61	11.2	168 / 168
Hat Yai	52.4Moderate	75	11.9	168 / 168
Khon Kaen	45.5Good	63	8.7	168 / 168
Phuket	42.1Good	53	8.2	168 / 168
Nakhon Ratchasima	40.2Good	62	6.6	168 / 168
Bangkok	38.6Good	60	6.8	168 / 168
Pattaya	23.6Good	43	2.7	168 / 168

City-hours by category

Good: 691

Moderate: 653

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	52	51	51	50	49	49	49	48	48	48	47	47	47	47	47	47	48	47	48	48	48	47	47	47
Thu	47	46	46	46	47	47	47	47	47	47	47	47	46	47	47	47	47	48	49	50	49	48	48	48
Fri	48	48	48	48	47	47	47	47	48	48	48	48	48	48	48	48	48	48	48	48	48	47	47	47
Sat	47	46	47	46	47	46	46	46	47	47	48	48	49	49	49	50	50	50	50	50	50	49	49	48
Sun	48	48	47	47	47	47	46	46	45	44	44	43	43	42	42	42	42	42	42	42	42	42	41	41
Mon	40	40	39	39	38	38	37	37	37	37	37	37	37	37	37	38	38	39	39	39	40	40	40	39
Tue	39	39	39	39	39	39	39	39	39	39	39	39	39	39	39	40	40	41	41	41	41	41	40	40

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	52	51	51	50	49	49	49	48	48	48	47	47	47	47	47	47	48	47	48	48	48	47	47	47
Thu	47	46	46	46	47	47	47	47	47	47	47	47	46	47	47	47	47	48	49	50	49	48	48	48
Fri	48	48	48	48	47	47	47	47	48	48	48	48	48	48	48	48	48	48	48	48	48	47	47	47
Sat	47	46	47	46	47	46	46	46	47	47	48	48	49	49	49	50	50	50	50	50	50	49	49	48
Sun	48	48	47	47	47	47	46	46	45	44	44	43	43	42	42	42	42	42	42	42	42	42	41	41
Mon	40	40	39	39	38	38	37	37	37	37	37	37	37	37	37	38	38	39	39	39	40	40	40	39
Tue	39	39	39	39	39	39	39	39	39	39	39	39	39	39	39	40	40	41	41	41	41	41	40	40

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	52	51	51	50	49	49	49	48	48	48	47	47	47	47	47	47	48	47	48	48	48	47	47	47
Thu	47	46	46	46	47	47	47	47	47	47	47	47	46	47	47	47	47	48	49	50	49	48	48	48
Fri	48	48	48	48	47	47	47	47	48	48	48	48	48	48	48	48	48	48	48	48	48	47	47	47
Sat	47	46	47	46	47	46	46	46	47	47	48	48	49	49	49	50	50	50	50	50	50	49	49	48
Sun	48	48	47	47	47	47	46	46	45	44	44	43	43	42	42	42	42	42	42	42	42	42	41	41
Mon	40	40	39	39	38	38	37	37	37	37	37	37	37	37	37	38	38	39	39	39	40	40	40	39
Tue	39	39	39	39	39	39	39	39	39	39	39	39	39	39	39	40	40	41	41	41	41	41	40	40