28 May – 3 Jun 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

55.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 12.6 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+0.9 AQI compared with the previous week’s mean of 55.

Highest hourly estimate: 135 in Hat Yai · 30 May, 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, 28 May	55.4Moderate	25–74	13.9	192 / 192
Thu, 29 May	57.2Moderate	34–77	12.6	192 / 192
Fri, 30 May	56.4Moderate	27–135	13.5	192 / 192
Sat, 31 May	59.5Moderate	28–121	13.5	192 / 192
Sun, 1 Jun	59.3Moderate	36–133	13.2	192 / 192
Mon, 2 Jun	53.6Moderate	28–75	10.2	192 / 192
Tue, 3 Jun	50Good	18–63	11.7	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	53	54	54	54	54	54	54	54	54	55	55	55	55	55	56	56	56	57	58	59	57	57	58	58
Thu	58	58	58	58	58	58	59	59	58	58	58	58	58	58	57	57	57	57	56	56	56	56	55	55
Fri	54	54	54	54	54	54	54	54	54	54	54	54	54	55	55	57	60	62	63	63	62	60	58	56
Sat	56	56	56	56	56	57	58	58	59	59	60	60	60	61	61	64	65	66	65	63	60	58	58	58
Sun	58	58	57	57	57	57	57	58	58	58	58	58	58	58	61	63	65	65	65	64	61	59	58	58
Mon	58	57	57	57	57	56	56	56	56	56	55	54	54	53	52	52	51	51	50	50	50	50	50	50
Tue	50	50	50	50	50	50	50	50	50	49	49	49	49	49	49	50	50	51	51	51	51	51	52	52

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	72.6Moderate	135	18.5	168 / 168
Nakhon Ratchasima	62.5Moderate	74	15.7	168 / 168
Khon Kaen	61.8Moderate	77	15.4	168 / 168
Phuket	56.1Moderate	105	11.7	168 / 168
Chiang Rai	55.4Moderate	62	12	168 / 168
Bangkok	52Moderate	64	10.7	168 / 168
Chiang Mai	51.3Moderate	60	10.6	168 / 168
Pattaya	35.8Good	57	6.5	168 / 168

City-hours by category

Good: 340

Moderate: 984

Unhealthy for Sensitive Groups: 20

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	53	54	54	54	54	54	54	54	54	55	55	55	55	55	56	56	56	57	58	59	57	57	58	58
Thu	58	58	58	58	58	58	59	59	58	58	58	58	58	58	57	57	57	57	56	56	56	56	55	55
Fri	54	54	54	54	54	54	54	54	54	54	54	54	54	55	55	57	60	62	63	63	62	60	58	56
Sat	56	56	56	56	56	57	58	58	59	59	60	60	60	61	61	64	65	66	65	63	60	58	58	58
Sun	58	58	57	57	57	57	57	58	58	58	58	58	58	58	61	63	65	65	65	64	61	59	58	58
Mon	58	57	57	57	57	56	56	56	56	56	55	54	54	53	52	52	51	51	50	50	50	50	50	50
Tue	50	50	50	50	50	50	50	50	50	49	49	49	49	49	49	50	50	51	51	51	51	51	52	52

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	53	54	54	54	54	54	54	54	54	55	55	55	55	55	56	56	56	57	58	59	57	57	58	58
Thu	58	58	58	58	58	58	59	59	58	58	58	58	58	58	57	57	57	57	56	56	56	56	55	55
Fri	54	54	54	54	54	54	54	54	54	54	54	54	54	55	55	57	60	62	63	63	62	60	58	56
Sat	56	56	56	56	56	57	58	58	59	59	60	60	60	61	61	64	65	66	65	63	60	58	58	58
Sun	58	58	57	57	57	57	57	58	58	58	58	58	58	58	61	63	65	65	65	64	61	59	58	58
Mon	58	57	57	57	57	56	56	56	56	56	55	54	54	53	52	52	51	51	50	50	50	50	50	50
Tue	50	50	50	50	50	50	50	50	50	49	49	49	49	49	49	50	50	51	51	51	51	51	52	52

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	53	54	54	54	54	54	54	54	54	55	55	55	55	55	56	56	56	57	58	59	57	57	58	58
Thu	58	58	58	58	58	58	59	59	58	58	58	58	58	58	57	57	57	57	56	56	56	56	55	55
Fri	54	54	54	54	54	54	54	54	54	54	54	54	54	55	55	57	60	62	63	63	62	60	58	56
Sat	56	56	56	56	56	57	58	58	59	59	60	60	60	61	61	64	65	66	65	63	60	58	58	58
Sun	58	58	57	57	57	57	57	58	58	58	58	58	58	58	61	63	65	65	65	64	61	59	58	58
Mon	58	57	57	57	57	56	56	56	56	56	55	54	54	53	52	52	51	51	50	50	50	50	50	50
Tue	50	50	50	50	50	50	50	50	50	49	49	49	49	49	49	50	50	51	51	51	51	51	52	52