22 – 28 Jul 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

45.7Weekly mean modelled AQI · Good

Mean PM2.5: 8.7 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-10.5 AQI compared with the previous week’s mean of 56.2.

Highest hourly estimate: 75 in Khon Kaen · 22 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, 22 Jul	55.6Moderate	39–75	10.7	192 / 192
Thu, 23 Jul	48.3Good	25–66	8.6	192 / 192
Fri, 24 Jul	47.2Good	18–68	10.6	192 / 192
Sat, 25 Jul	44.6Good	21–71	7.9	192 / 192
Sun, 26 Jul	43.6Good	24–58	7.8	192 / 192
Mon, 27 Jul	38.8Good	20–58	6.8	192 / 192
Tue, 28 Jul	41.6Good	20–54	8.4	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	58	58	58	58	58	58	58	58	57	56	56	56	55	55	55	55	54	54	54	54	54	53	53	52
Thu	51	51	50	50	50	49	49	48	49	49	49	49	49	49	48	48	48	47	47	47	47	46	46	46
Fri	46	46	46	46	46	45	45	45	46	46	47	47	47	48	48	49	49	49	49	49	49	49	49	48
Sat	48	48	47	47	47	46	46	46	45	45	44	44	43	43	43	43	43	43	45	45	43	43	42	41
Sun	41	41	42	42	42	43	43	43	44	44	45	45	45	45	45	45	45	45	45	45	44	44	43	42
Mon	41	41	41	40	40	40	39	39	38	38	38	38	38	38	38	39	39	39	39	39	38	38	38	38
Tue	38	38	38	39	39	40	40	40	41	42	42	42	43	42	42	43	43	43	43	43	44	44	45	45

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
Khon Kaen	53Moderate	75	10.7	168 / 168
Nakhon Ratchasima	52.6Moderate	72	10.3	168 / 168
Chiang Mai	50.3Moderate	71	10.1	168 / 168
Bangkok	48.5Good	65	9.2	168 / 168
Chiang Rai	46.4Good	63	8.7	168 / 168
Phuket	43.1Good	53	8.1	168 / 168
Hat Yai	43Good	54	8	168 / 168
Pattaya	28.6Good	52	4.3	168 / 168

City-hours by category

Good: 798

Moderate: 546

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	58	58	58	58	58	58	58	58	57	56	56	56	55	55	55	55	54	54	54	54	54	53	53	52
Thu	51	51	50	50	50	49	49	48	49	49	49	49	49	49	48	48	48	47	47	47	47	46	46	46
Fri	46	46	46	46	46	45	45	45	46	46	47	47	47	48	48	49	49	49	49	49	49	49	49	48
Sat	48	48	47	47	47	46	46	46	45	45	44	44	43	43	43	43	43	43	45	45	43	43	42	41
Sun	41	41	42	42	42	43	43	43	44	44	45	45	45	45	45	45	45	45	45	45	44	44	43	42
Mon	41	41	41	40	40	40	39	39	38	38	38	38	38	38	38	39	39	39	39	39	38	38	38	38
Tue	38	38	38	39	39	40	40	40	41	42	42	42	43	42	42	43	43	43	43	43	44	44	45	45

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	58	58	58	58	58	58	58	58	57	56	56	56	55	55	55	55	54	54	54	54	54	53	53	52
Thu	51	51	50	50	50	49	49	48	49	49	49	49	49	49	48	48	48	47	47	47	47	46	46	46
Fri	46	46	46	46	46	45	45	45	46	46	47	47	47	48	48	49	49	49	49	49	49	49	49	48
Sat	48	48	47	47	47	46	46	46	45	45	44	44	43	43	43	43	43	43	45	45	43	43	42	41
Sun	41	41	42	42	42	43	43	43	44	44	45	45	45	45	45	45	45	45	45	45	44	44	43	42
Mon	41	41	41	40	40	40	39	39	38	38	38	38	38	38	38	39	39	39	39	39	38	38	38	38
Tue	38	38	38	39	39	40	40	40	41	42	42	42	43	42	42	43	43	43	43	43	44	44	45	45

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	58	58	58	58	58	58	58	58	57	56	56	56	55	55	55	55	54	54	54	54	54	53	53	52
Thu	51	51	50	50	50	49	49	48	49	49	49	49	49	49	48	48	48	47	47	47	47	46	46	46
Fri	46	46	46	46	46	45	45	45	46	46	47	47	47	48	48	49	49	49	49	49	49	49	49	48
Sat	48	48	47	47	47	46	46	46	45	45	44	44	43	43	43	43	43	43	45	45	43	43	42	41
Sun	41	41	42	42	42	43	43	43	44	44	45	45	45	45	45	45	45	45	45	45	44	44	43	42
Mon	41	41	41	40	40	40	39	39	38	38	38	38	38	38	38	39	39	39	39	39	38	38	38	38
Tue	38	38	38	39	39	40	40	40	41	42	42	42	43	42	42	43	43	43	43	43	44	44	45	45