15 – 21 Jul 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

56.2Weekly mean modelled AQI · Moderate

Mean PM2.5: 13 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+7.9 AQI compared with the previous week’s mean of 48.3.

Highest hourly estimate: 121 in Hat Yai · 16 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, 15 Jul	48.8Good	18–85	11.1	192 / 192
Thu, 16 Jul	53.8Moderate	31–121	11.2	192 / 192
Fri, 17 Jul	54.6Moderate	30–109	12.2	192 / 192
Sat, 18 Jul	57.4Moderate	35–71	14.3	192 / 192
Sun, 19 Jul	61.3Moderate	41–81	15.4	192 / 192
Mon, 20 Jul	59Moderate	43–78	13.2	192 / 192
Tue, 21 Jul	58.3Moderate	37–75	13.9	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	47	47	47	47	47	48	48	48	48	48	48	49	49	49	49	49	50	50	52	52	51	51	50	50
Thu	50	50	50	51	51	52	52	52	52	52	52	52	52	52	52	52	55	58	61	62	61	60	57	54
Fri	53	53	53	53	53	53	53	53	53	53	53	53	53	53	53	55	57	59	60	60	58	56	54	55
Sat	55	55	55	55	56	56	56	56	56	57	57	57	58	58	59	59	59	59	59	59	60	59	60	60
Sun	60	60	60	60	61	61	61	61	61	62	62	62	62	62	62	62	62	62	62	62	62	62	62	62
Mon	61	61	61	61	61	61	61	60	60	60	59	59	59	59	58	58	58	57	57	57	57	57	57	57
Tue	58	57	58	58	58	58	58	58	58	59	59	59	59	59	59	59	59	59	59	59	58	58	58	58

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
Khon Kaen	64.5Moderate	81	17.3	168 / 168
Nakhon Ratchasima	62.3Moderate	74	16.1	168 / 168
Hat Yai	59.7Moderate	121	11.9	168 / 168
Chiang Rai	58.1Moderate	70	13.3	168 / 168
Bangkok	54.5Moderate	70	13.7	168 / 168
Chiang Mai	54.5Moderate	69	12.3	168 / 168
Phuket	53.1Moderate	90	11.1	168 / 168
Pattaya	42.7Good	54	8.4	168 / 168

City-hours by category

Good: 326

Moderate: 1010

Unhealthy for Sensitive Groups: 8

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

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

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