2 – 8 Jul 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

52.9Weekly 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.

-1.4 AQI compared with the previous week’s mean of 54.3.

Highest hourly estimate: 73 in Chiang Mai · 4 Jul, 03:00 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, 2 Jul	52.3Moderate	22–67	11.1	192 / 192
Thu, 3 Jul	53.1Moderate	22–70	12.5	192 / 192
Fri, 4 Jul	57Moderate	23–73	13.6	192 / 192
Sat, 5 Jul	54.3Moderate	19–69	11.6	192 / 192
Sun, 6 Jul	51.7Moderate	19–70	11.4	192 / 192
Mon, 7 Jul	50.7Moderate	21–64	9.9	192 / 192
Tue, 8 Jul	51.1Moderate	27–68	11.3	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	53	53	53	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52
Thu	52	52	52	52	52	52	53	53	52	53	53	53	53	53	53	54	54	54	54	54	54	54	55	55
Fri	56	56	56	57	57	57	57	57	58	58	58	58	57	57	57	57	57	57	57	57	57	57	57	57
Sat	56	56	56	56	55	55	55	55	55	54	54	54	54	54	54	54	54	54	54	53	53	53	53	53
Sun	52	52	52	52	51	51	51	51	51	51	51	51	51	51	51	52	52	52	52	53	53	53	52	52
Mon	52	52	52	52	52	51	51	51	51	51	50	51	50	50	50	50	51	51	50	50	50	50	49	49
Tue	49	49	49	49	50	50	50	51	51	51	51	51	51	52	52	52	52	52	52	52	52	53	53	53

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	65.5Moderate	73	17.4	168 / 168
Chiang Rai	59.6Moderate	66	14.4	168 / 168
Khon Kaen	59.4Moderate	69	13.3	168 / 168
Nakhon Ratchasima	56Moderate	61	11.9	168 / 168
Bangkok	54.7Moderate	61	11.6	168 / 168
Hat Yai	54.2Moderate	60	11.2	168 / 168
Phuket	47.8Good	56	9	168 / 168
Pattaya	25.9Good	35	4.5	168 / 168

City-hours by category

Good: 315

Moderate: 1029

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	53	54	54	53	53	53	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52
Thu	52	52	52	52	52	52	53	53	52	53	53	53	53	53	53	54	54	54	54	54	54	54	55	55
Fri	56	56	56	57	57	57	57	57	58	58	58	58	57	57	57	57	57	57	57	57	57	57	57	57
Sat	56	56	56	56	55	55	55	55	55	54	54	54	54	54	54	54	54	54	54	53	53	53	53	53
Sun	52	52	52	52	51	51	51	51	51	51	51	51	51	51	51	52	52	52	52	53	53	53	52	52
Mon	52	52	52	52	52	51	51	51	51	51	50	51	50	50	50	50	51	51	50	50	50	50	49	49
Tue	49	49	49	49	50	50	50	51	51	51	51	51	51	52	52	52	52	52	52	52	52	53	53	53

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	53	53	53	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52
Thu	52	52	52	52	52	52	53	53	52	53	53	53	53	53	53	54	54	54	54	54	54	54	55	55
Fri	56	56	56	57	57	57	57	57	58	58	58	58	57	57	57	57	57	57	57	57	57	57	57	57
Sat	56	56	56	56	55	55	55	55	55	54	54	54	54	54	54	54	54	54	54	53	53	53	53	53
Sun	52	52	52	52	51	51	51	51	51	51	51	51	51	51	51	52	52	52	52	53	53	53	52	52
Mon	52	52	52	52	52	51	51	51	51	51	50	51	50	50	50	50	51	51	50	50	50	50	49	49
Tue	49	49	49	49	50	50	50	51	51	51	51	51	51	52	52	52	52	52	52	52	52	53	53	53

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	53	53	53	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52
Thu	52	52	52	52	52	52	53	53	52	53	53	53	53	53	53	54	54	54	54	54	54	54	55	55
Fri	56	56	56	57	57	57	57	57	58	58	58	58	57	57	57	57	57	57	57	57	57	57	57	57
Sat	56	56	56	56	55	55	55	55	55	54	54	54	54	54	54	54	54	54	54	53	53	53	53	53
Sun	52	52	52	52	51	51	51	51	51	51	51	51	51	51	51	52	52	52	52	53	53	53	52	52
Mon	52	52	52	52	52	51	51	51	51	51	50	51	50	50	50	50	51	51	50	50	50	50	49	49
Tue	49	49	49	49	50	50	50	51	51	51	51	51	51	52	52	52	52	52	52	52	52	53	53	53