9 – 15 Jul 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

54Weekly mean modelled AQI · Moderate

Mean PM2.5: 12.2 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+1.1 AQI compared with the previous week’s mean of 52.9.

Highest hourly estimate: 79 in Bangkok · 14 Jul, 19:00 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, 9 Jul	52.3Moderate	27–68	11.5	192 / 192
Thu, 10 Jul	54.2Moderate	26–69	12.4	192 / 192
Fri, 11 Jul	50.8Moderate	23–70	9.5	192 / 192
Sat, 12 Jul	47.4Good	21–75	11.1	192 / 192
Sun, 13 Jul	55Moderate	27–78	13.2	192 / 192
Mon, 14 Jul	61Moderate	36–79	16	192 / 192
Tue, 15 Jul	57.4Moderate	27–78	11.8	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	53	53	52	52	52	52	52	52	52	52	52	52	52	53	53	53	53	53	53	53	52	53	52	52
Thu	52	53	53	53	53	54	54	54	54	54	54	54	54	54	55	55	55	55	56	56	56	56	56	56
Fri	55	55	55	55	54	54	54	53	53	52	51	51	50	50	50	49	49	48	48	48	47	47	46	46
Sat	46	46	46	45	45	46	45	45	46	46	46	47	47	47	48	48	49	49	49	49	50	50	51	52
Sun	52	53	53	54	54	55	55	56	56	56	56	56	56	55	55	55	56	56	56	56	56	56	56	56
Mon	57	57	57	57	58	58	58	59	59	60	61	61	62	62	63	63	64	64	64	64	64	64	64	64
Tue	63	63	62	62	62	62	61	61	60	59	58	57	57	56	56	55	55	54	54	53	53	53	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
Chiang Mai	68.1Moderate	75	18.7	168 / 168
Khon Kaen	60.2Moderate	78	14.8	168 / 168
Chiang Rai	58.6Moderate	68	13.3	168 / 168
Bangkok	58.2Moderate	79	13.8	168 / 168
Nakhon Ratchasima	56.4Moderate	68	13	168 / 168
Hat Yai	49.8Good	62	9.6	168 / 168
Phuket	45.3Good	51	7.8	168 / 168
Pattaya	35.8Good	57	6.8	168 / 168

City-hours by category

Good: 431

Moderate: 913

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