25 Jun – 1 Jul 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

54.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 12.3 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+3.5 AQI compared with the previous week’s mean of 50.8.

Highest hourly estimate: 119 in Hat Yai · 26 Jun, 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, 25 Jun	54.6Moderate	24–67	13.9	192 / 192
Thu, 26 Jun	63.1Moderate	27–119	16.9	192 / 192
Fri, 27 Jun	58Moderate	29–86	12.8	192 / 192
Sat, 28 Jun	52.8Moderate	24–77	10.4	192 / 192
Sun, 29 Jun	50.2Moderate	20–65	10.2	192 / 192
Mon, 30 Jun	49.2Good	19–61	10.1	192 / 192
Tue, 1 Jul	52.1Moderate	22–66	12	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	52	52	53	53	53	54	54	54	54	54	54	54	55	55	55	56	56	57	57	57	57	57	57
Thu	57	58	58	59	60	60	61	62	62	62	63	63	64	64	64	65	67	69	70	69	67	65	65	64
Fri	64	63	62	61	61	60	59	59	58	58	57	57	57	57	57	57	57	56	56	56	56	56	55	55
Sat	56	55	55	55	55	55	54	54	54	53	53	53	53	52	52	52	52	51	51	51	51	51	51	51
Sun	51	51	51	51	51	51	51	51	51	50	50	50	50	50	50	50	50	50	50	50	50	50	49	49
Mon	48	48	48	49	49	49	49	49	49	49	50	50	50	50	50	50	50	49	49	49	49	49	49	50
Tue	50	50	51	51	51	51	51	52	52	52	52	52	52	53	53	53	54	54	54	54	54	53	53	54

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	67Moderate	119	17.6	168 / 168
Chiang Mai	61.3Moderate	73	15.1	168 / 168
Khon Kaen	57.8Moderate	68	13.4	168 / 168
Chiang Rai	57.2Moderate	67	12.6	168 / 168
Nakhon Ratchasima	55.2Moderate	76	12.1	168 / 168
Phuket	54.7Moderate	65	11.7	168 / 168
Bangkok	53.2Moderate	61	11.2	168 / 168
Pattaya	27.8Good	38	4.8	168 / 168

City-hours by category

Good: 309

Moderate: 1032

Unhealthy for Sensitive Groups: 3

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	52	52	53	53	53	54	54	54	54	54	54	54	55	55	55	56	56	57	57	57	57	57	57
Thu	57	58	58	59	60	60	61	62	62	62	63	63	64	64	64	65	67	69	70	69	67	65	65	64
Fri	64	63	62	61	61	60	59	59	58	58	57	57	57	57	57	57	57	56	56	56	56	56	55	55
Sat	56	55	55	55	55	55	54	54	54	53	53	53	53	52	52	52	52	51	51	51	51	51	51	51
Sun	51	51	51	51	51	51	51	51	51	50	50	50	50	50	50	50	50	50	50	50	50	50	49	49
Mon	48	48	48	49	49	49	49	49	49	49	50	50	50	50	50	50	50	49	49	49	49	49	49	50
Tue	50	50	51	51	51	51	51	52	52	52	52	52	52	53	53	53	54	54	54	54	54	53	53	54

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	52	52	53	53	53	54	54	54	54	54	54	54	55	55	55	56	56	57	57	57	57	57	57
Thu	57	58	58	59	60	60	61	62	62	62	63	63	64	64	64	65	67	69	70	69	67	65	65	64
Fri	64	63	62	61	61	60	59	59	58	58	57	57	57	57	57	57	57	56	56	56	56	56	55	55
Sat	56	55	55	55	55	55	54	54	54	53	53	53	53	52	52	52	52	51	51	51	51	51	51	51
Sun	51	51	51	51	51	51	51	51	51	50	50	50	50	50	50	50	50	50	50	50	50	50	49	49
Mon	48	48	48	49	49	49	49	49	49	49	50	50	50	50	50	50	50	49	49	49	49	49	49	50
Tue	50	50	51	51	51	51	51	52	52	52	52	52	52	53	53	53	54	54	54	54	54	53	53	54

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	52	52	53	53	53	54	54	54	54	54	54	54	55	55	55	56	56	57	57	57	57	57	57
Thu	57	58	58	59	60	60	61	62	62	62	63	63	64	64	64	65	67	69	70	69	67	65	65	64
Fri	64	63	62	61	61	60	59	59	58	58	57	57	57	57	57	57	57	56	56	56	56	56	55	55
Sat	56	55	55	55	55	55	54	54	54	53	53	53	53	52	52	52	52	51	51	51	51	51	51	51
Sun	51	51	51	51	51	51	51	51	51	50	50	50	50	50	50	50	50	50	50	50	50	50	49	49
Mon	48	48	48	49	49	49	49	49	49	49	50	50	50	50	50	50	50	49	49	49	49	49	49	50
Tue	50	50	51	51	51	51	51	52	52	52	52	52	52	53	53	53	54	54	54	54	54	53	53	54