8 – 14 Jul 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

48.3Weekly mean modelled AQI · Good

Mean PM2.5: 9.6 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+2.4 AQI compared with the previous week’s mean of 45.9.

Highest hourly estimate: 65 in Chiang Rai · 13 Jul, 09:00 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, 8 Jul	55.9Moderate	39–62	11	192 / 192
Thu, 9 Jul	50.8Moderate	35–62	10.6	192 / 192
Fri, 10 Jul	51.6Moderate	30–62	10.7	192 / 192
Sat, 11 Jul	48.2Good	28–60	8.2	192 / 192
Sun, 12 Jul	41.7Good	18–56	7.8	192 / 192
Mon, 13 Jul	42.8Good	18–65	9.3	192 / 192
Tue, 14 Jul	46.8Good	17–63	9.7	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	56	56	56	57	57	57	57	57	57	57	57	57	57	57	56	56	56	55	55	54	54	54	54	53
Thu	53	53	52	52	52	52	51	51	51	51	50	50	50	50	50	50	50	50	50	50	50	50	51	51
Fri	51	51	51	51	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	51	51
Sat	51	51	51	50	50	50	49	49	49	49	49	49	48	48	48	48	48	47	47	46	46	45	45	45
Sun	44	44	43	43	43	43	42	42	42	42	42	41	41	41	41	41	40	41	41	41	41	41	41	40
Mon	41	41	41	41	41	41	41	41	41	41	41	42	42	43	43	44	44	45	45	46	46	46	46	46
Tue	46	46	46	46	46	46	46	46	46	46	46	47	47	47	47	47	48	48	48	48	48	48	48	47

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	54.5Moderate	63	11.9	168 / 168
Phuket	53Moderate	59	10.9	168 / 168
Khon Kaen	52.1Moderate	62	10.8	168 / 168
Nakhon Ratchasima	51Moderate	61	10.8	168 / 168
Chiang Mai	47.9Good	55	8.9	168 / 168
Chiang Rai	46.6Good	65	9.6	168 / 168
Bangkok	45.2Good	62	8.9	168 / 168
Pattaya	35.8Good	55	5.4	168 / 168

City-hours by category

Good: 553

Moderate: 791

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	56	56	56	57	57	57	57	57	57	57	57	57	57	57	56	56	56	55	55	54	54	54	54	53
Thu	53	53	52	52	52	52	51	51	51	51	50	50	50	50	50	50	50	50	50	50	50	50	51	51
Fri	51	51	51	51	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	51	51
Sat	51	51	51	50	50	50	49	49	49	49	49	49	48	48	48	48	48	47	47	46	46	45	45	45
Sun	44	44	43	43	43	43	42	42	42	42	42	41	41	41	41	41	40	41	41	41	41	41	41	40
Mon	41	41	41	41	41	41	41	41	41	41	41	42	42	43	43	44	44	45	45	46	46	46	46	46
Tue	46	46	46	46	46	46	46	46	46	46	46	47	47	47	47	47	48	48	48	48	48	48	48	47

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	56	56	56	57	57	57	57	57	57	57	57	57	57	57	56	56	56	55	55	54	54	54	54	53
Thu	53	53	52	52	52	52	51	51	51	51	50	50	50	50	50	50	50	50	50	50	50	50	51	51
Fri	51	51	51	51	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	51	51
Sat	51	51	51	50	50	50	49	49	49	49	49	49	48	48	48	48	48	47	47	46	46	45	45	45
Sun	44	44	43	43	43	43	42	42	42	42	42	41	41	41	41	41	40	41	41	41	41	41	41	40
Mon	41	41	41	41	41	41	41	41	41	41	41	42	42	43	43	44	44	45	45	46	46	46	46	46
Tue	46	46	46	46	46	46	46	46	46	46	46	47	47	47	47	47	48	48	48	48	48	48	48	47

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	56	56	56	57	57	57	57	57	57	57	57	57	57	57	56	56	56	55	55	54	54	54	54	53
Thu	53	53	52	52	52	52	51	51	51	51	50	50	50	50	50	50	50	50	50	50	50	50	51	51
Fri	51	51	51	51	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	51	51
Sat	51	51	51	50	50	50	49	49	49	49	49	49	48	48	48	48	48	47	47	46	46	45	45	45
Sun	44	44	43	43	43	43	42	42	42	42	42	41	41	41	41	41	40	41	41	41	41	41	41	40
Mon	41	41	41	41	41	41	41	41	41	41	41	42	42	43	43	44	44	45	45	46	46	46	46	46
Tue	46	46	46	46	46	46	46	46	46	46	46	47	47	47	47	47	48	48	48	48	48	48	48	47