30 Jul – 5 Aug 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

52.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 11.6 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+9.7 AQI compared with the previous week’s mean of 42.6.

Highest hourly estimate: 119 in Hat Yai · 2 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, 30 Jul	42.4Good	18–64	8.7	192 / 192
Thu, 31 Jul	48.4Good	17–68	11.3	192 / 192
Fri, 1 Aug	53.3Moderate	27–94	11.5	192 / 192
Sat, 2 Aug	57.1Moderate	34–119	14.3	192 / 192
Sun, 3 Aug	58.3Moderate	36–86	13.3	192 / 192
Mon, 4 Aug	55Moderate	31–76	11.6	192 / 192
Tue, 5 Aug	51.6Moderate	25–69	10.8	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	43	42	43	42	43	43	43	43	43	43	42	42	42	42	42	42	42	42	42	42	42	43	43	43
Thu	43	44	44	45	45	46	46	46	47	47	48	48	49	49	50	50	51	52	52	52	52	52	52	52
Fri	53	52	53	52	53	53	52	52	53	53	53	52	52	52	52	52	52	53	55	57	57	56	56	54
Sat	53	53	53	53	54	54	54	55	55	56	56	56	57	57	58	58	61	62	63	63	62	60	59	59
Sun	59	59	59	59	59	59	59	59	59	59	59	59	59	59	58	58	58	58	57	57	57	57	56	56
Mon	56	56	56	56	56	56	56	56	55	55	54	54	54	54	54	54	53	54	56	57	56	55	55	55
Tue	55	55	54	53	52	51	51	50	51	51	51	51	51	51	51	51	51	51	52	52	51	51	51	51

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	66Moderate	76	17.6	168 / 168
Hat Yai	65.8Moderate	119	16	168 / 168
Chiang Rai	56.6Moderate	63	12.5	168 / 168
Nakhon Ratchasima	52.8Moderate	69	11.4	168 / 168
Bangkok	52.7Moderate	76	12.3	168 / 168
Khon Kaen	50.6Moderate	57	10.2	168 / 168
Phuket	42.8Good	51	7.8	168 / 168
Pattaya	31Good	48	5.5	168 / 168

City-hours by category

Good: 467

Moderate: 872

Unhealthy for Sensitive Groups: 5

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

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

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