29 Jul – 4 Aug 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

46.3Weekly mean modelled AQI · Good

Mean PM2.5: 9.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+0.6 AQI compared with the previous week’s mean of 45.7.

Highest hourly estimate: 123 in Hat Yai · 3 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, 29 Jul	44.9Good	17–60	9.1	192 / 192
Thu, 30 Jul	44.4Good	19–60	8.3	192 / 192
Fri, 31 Jul	42.7Good	15–56	7.4	192 / 192
Sat, 1 Aug	42.5Good	18–52	7.6	192 / 192
Sun, 2 Aug	40.9Good	17–83	8.6	192 / 192
Mon, 3 Aug	53.8Moderate	32–123	13.5	192 / 192
Tue, 4 Aug	55Moderate	43–79	9.2	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	45	45	45	46	46	45	45	46	46	46	45	46	45	45	45	45	45	44	44	44	44	44	44	44
Thu	44	44	44	45	44	44	44	44	44	44	44	44	44	44	45	44	45	45	45	45	45	45	44	44
Fri	44	43	43	43	43	43	43	43	43	43	43	43	42	42	42	42	43	43	44	43	43	42	42	42
Sat	42	42	42	42	42	42	41	41	42	42	42	42	43	43	43	43	44	44	44	44	44	43	43	42
Sun	41	41	40	40	40	40	40	39	39	39	40	39	40	40	40	40	41	43	44	44	43	43	43	43
Mon	44	45	45	46	46	47	47	48	49	50	51	52	53	54	56	59	61	63	64	64	63	63	62	60
Tue	59	58	59	59	58	58	58	58	57	57	56	55	55	54	54	53	53	53	53	52	51	51	51	50

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	52.8Moderate	123	10.6	168 / 168
Khon Kaen	51.6Moderate	60	10.1	168 / 168
Nakhon Ratchasima	50Good	61	10.2	168 / 168
Bangkok	48.6Good	58	9.6	168 / 168
Chiang Mai	47.9Good	58	9.3	168 / 168
Phuket	47.5Good	71	9.8	168 / 168
Chiang Rai	44.5Good	53	8.2	168 / 168
Pattaya	27.6Good	50	4.9	168 / 168

City-hours by category

Good: 743

Moderate: 594

Unhealthy for Sensitive Groups: 7

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	45	45	45	46	46	45	45	46	46	46	45	46	45	45	45	45	45	44	44	44	44	44	44	44
Thu	44	44	44	45	44	44	44	44	44	44	44	44	44	44	45	44	45	45	45	45	45	45	44	44
Fri	44	43	43	43	43	43	43	43	43	43	43	43	42	42	42	42	43	43	44	43	43	42	42	42
Sat	42	42	42	42	42	42	41	41	42	42	42	42	43	43	43	43	44	44	44	44	44	43	43	42
Sun	41	41	40	40	40	40	40	39	39	39	40	39	40	40	40	40	41	43	44	44	43	43	43	43
Mon	44	45	45	46	46	47	47	48	49	50	51	52	53	54	56	59	61	63	64	64	63	63	62	60
Tue	59	58	59	59	58	58	58	58	57	57	56	55	55	54	54	53	53	53	53	52	51	51	51	50

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	45	45	45	46	46	45	45	46	46	46	45	46	45	45	45	45	45	44	44	44	44	44	44	44
Thu	44	44	44	45	44	44	44	44	44	44	44	44	44	44	45	44	45	45	45	45	45	45	44	44
Fri	44	43	43	43	43	43	43	43	43	43	43	43	42	42	42	42	43	43	44	43	43	42	42	42
Sat	42	42	42	42	42	42	41	41	42	42	42	42	43	43	43	43	44	44	44	44	44	43	43	42
Sun	41	41	40	40	40	40	40	39	39	39	40	39	40	40	40	40	41	43	44	44	43	43	43	43
Mon	44	45	45	46	46	47	47	48	49	50	51	52	53	54	56	59	61	63	64	64	63	63	62	60
Tue	59	58	59	59	58	58	58	58	57	57	56	55	55	54	54	53	53	53	53	52	51	51	51	50

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	45	45	45	46	46	45	45	46	46	46	45	46	45	45	45	45	45	44	44	44	44	44	44	44
Thu	44	44	44	45	44	44	44	44	44	44	44	44	44	44	45	44	45	45	45	45	45	45	44	44
Fri	44	43	43	43	43	43	43	43	43	43	43	43	42	42	42	42	43	43	44	43	43	42	42	42
Sat	42	42	42	42	42	42	41	41	42	42	42	42	43	43	43	43	44	44	44	44	44	43	43	42
Sun	41	41	40	40	40	40	40	39	39	39	40	39	40	40	40	40	41	43	44	44	43	43	43	43
Mon	44	45	45	46	46	47	47	48	49	50	51	52	53	54	56	59	61	63	64	64	63	63	62	60
Tue	59	58	59	59	58	58	58	58	57	57	56	55	55	54	54	53	53	53	53	52	51	51	51	50