17 – 23 Jul 2024 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

48.8Weekly mean modelled AQI · Good

Mean PM2.5: 11 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 47.9.

Highest hourly estimate: 106 in Hat Yai · 18 Jul, 20:00 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, 17 Jul	44.9Good	14–62	9.2	192 / 192
Thu, 18 Jul	47.4Good	14–106	10.2	192 / 192
Fri, 19 Jul	46.7Good	14–95	10.1	192 / 192
Sat, 20 Jul	47.1Good	21–85	11.7	192 / 192
Sun, 21 Jul	50Good	20–95	12.6	192 / 192
Mon, 22 Jul	54.3Moderate	29–90	12.3	192 / 192
Tue, 23 Jul	51.3Moderate	26–81	10.7	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	46	45	45	45	45	44	44	44	44	44	45	45	45	45	45	45	45	45	45	45	45	46	46	46
Thu	46	46	46	46	46	46	45	45	45	45	45	45	45	45	46	47	49	51	52	52	52	51	51	50
Fri	49	48	47	46	46	46	47	47	47	47	47	47	47	47	47	47	47	47	47	47	46	46	46	46
Sat	45	45	46	46	46	46	46	46	46	46	47	47	47	47	48	48	48	48	49	49	49	49	49	49
Sun	49	49	49	49	49	49	50	50	50	50	50	50	49	50	50	50	50	50	50	51	51	51	52	53
Mon	53	54	54	54	55	55	55	55	55	55	55	55	55	55	55	55	55	55	54	54	54	53	53	53
Tue	53	52	52	52	52	51	51	52	52	51	51	51	51	51	51	51	51	51	51	51	51	51	51	50

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	77.5Moderate	106	22.8	168 / 168
Phuket	63Moderate	73	16	168 / 168
Chiang Mai	53.4Moderate	64	10.8	168 / 168
Nakhon Ratchasima	49.9Good	62	10.5	168 / 168
Khon Kaen	44.4Good	56	8.4	168 / 168
Bangkok	40.5Good	69	8.4	168 / 168
Chiang Rai	38.3Good	50	6.8	168 / 168
Pattaya	23.5Good	35	4.2	168 / 168

City-hours by category

Good: 674

Moderate: 664

Unhealthy for Sensitive Groups: 6

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	46	45	45	45	45	44	44	44	44	44	45	45	45	45	45	45	45	45	45	45	45	46	46	46
Thu	46	46	46	46	46	46	45	45	45	45	45	45	45	45	46	47	49	51	52	52	52	51	51	50
Fri	49	48	47	46	46	46	47	47	47	47	47	47	47	47	47	47	47	47	47	47	46	46	46	46
Sat	45	45	46	46	46	46	46	46	46	46	47	47	47	47	48	48	48	48	49	49	49	49	49	49
Sun	49	49	49	49	49	49	50	50	50	50	50	50	49	50	50	50	50	50	50	51	51	51	52	53
Mon	53	54	54	54	55	55	55	55	55	55	55	55	55	55	55	55	55	55	54	54	54	53	53	53
Tue	53	52	52	52	52	51	51	52	52	51	51	51	51	51	51	51	51	51	51	51	51	51	51	50

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	46	45	45	45	45	44	44	44	44	44	45	45	45	45	45	45	45	45	45	45	45	46	46	46
Thu	46	46	46	46	46	46	45	45	45	45	45	45	45	45	46	47	49	51	52	52	52	51	51	50
Fri	49	48	47	46	46	46	47	47	47	47	47	47	47	47	47	47	47	47	47	47	46	46	46	46
Sat	45	45	46	46	46	46	46	46	46	46	47	47	47	47	48	48	48	48	49	49	49	49	49	49
Sun	49	49	49	49	49	49	50	50	50	50	50	50	49	50	50	50	50	50	50	51	51	51	52	53
Mon	53	54	54	54	55	55	55	55	55	55	55	55	55	55	55	55	55	55	54	54	54	53	53	53
Tue	53	52	52	52	52	51	51	52	52	51	51	51	51	51	51	51	51	51	51	51	51	51	51	50

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	46	45	45	45	45	44	44	44	44	44	45	45	45	45	45	45	45	45	45	45	45	46	46	46
Thu	46	46	46	46	46	46	45	45	45	45	45	45	45	45	46	47	49	51	52	52	52	51	51	50
Fri	49	48	47	46	46	46	47	47	47	47	47	47	47	47	47	47	47	47	47	47	46	46	46	46
Sat	45	45	46	46	46	46	46	46	46	46	47	47	47	47	48	48	48	48	49	49	49	49	49	49
Sun	49	49	49	49	49	49	50	50	50	50	50	50	49	50	50	50	50	50	50	51	51	51	52	53
Mon	53	54	54	54	55	55	55	55	55	55	55	55	55	55	55	55	55	55	54	54	54	53	53	53
Tue	53	52	52	52	52	51	51	52	52	51	51	51	51	51	51	51	51	51	51	51	51	51	51	50