12 – 18 Jul 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

47.2Weekly mean modelled AQI · Good

Mean PM2.5: 9.5 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-2.1 AQI compared with the previous week’s mean of 49.3.

Highest hourly estimate: 87 in Nakhon Ratchasima · 13 Jul, 16:00 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, 12 Jul	51.8Moderate	33–75	12.3	192 / 192
Thu, 13 Jul	55.8Moderate	34–87	11.5	192 / 192
Fri, 14 Jul	46.4Good	31–81	8.1	192 / 192
Sat, 15 Jul	48.4Good	32–61	10.6	192 / 192
Sun, 16 Jul	46.8Good	18–61	7.5	192 / 192
Mon, 17 Jul	39.7Good	17–59	7.9	192 / 192
Tue, 18 Jul	41.5Good	17–61	8.2	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	50	51	51	51	51	51	51	51	51	51	51	52	52	52	52	52	52	53	53	53	53	53	54	54
Thu	54	55	55	55	56	56	56	57	57	57	57	57	57	56	57	56	56	56	56	55	55	54	54	54
Fri	53	52	52	51	50	49	48	48	47	46	46	46	45	45	45	44	44	44	44	44	44	43	43	43
Sat	43	43	44	44	45	46	46	47	48	48	49	49	49	50	50	50	51	51	51	52	52	52	52	52
Sun	52	52	52	52	51	51	50	50	49	48	47	47	46	46	45	45	44	44	43	43	43	42	41	41
Mon	41	40	40	40	39	39	39	39	39	39	39	39	39	39	39	39	40	40	41	41	41	41	42	41
Tue	41	40	40	40	40	40	41	41	41	40	41	41	41	41	42	43	43	44	44	44	44	43	42	42

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
Phuket	55.2Moderate	59	11.9	168 / 168
Khon Kaen	49.3Good	75	10	168 / 168
Hat Yai	48.3Good	57	9.1	168 / 168
Nakhon Ratchasima	48.3Good	87	10.5	168 / 168
Chiang Mai	47.8Good	57	9.1	168 / 168
Chiang Rai	47.6Good	61	9.8	168 / 168
Bangkok	47.5Good	66	9.9	168 / 168
Pattaya	33.6Good	56	5.4	168 / 168

City-hours by category

Good: 715

Moderate: 629

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	50	51	51	51	51	51	51	51	51	51	51	52	52	52	52	52	52	53	53	53	53	53	54	54
Thu	54	55	55	55	56	56	56	57	57	57	57	57	57	56	57	56	56	56	56	55	55	54	54	54
Fri	53	52	52	51	50	49	48	48	47	46	46	46	45	45	45	44	44	44	44	44	44	43	43	43
Sat	43	43	44	44	45	46	46	47	48	48	49	49	49	50	50	50	51	51	51	52	52	52	52	52
Sun	52	52	52	52	51	51	50	50	49	48	47	47	46	46	45	45	44	44	43	43	43	42	41	41
Mon	41	40	40	40	39	39	39	39	39	39	39	39	39	39	39	39	40	40	41	41	41	41	42	41
Tue	41	40	40	40	40	40	41	41	41	40	41	41	41	41	42	43	43	44	44	44	44	43	42	42

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	50	51	51	51	51	51	51	51	51	51	51	52	52	52	52	52	52	53	53	53	53	53	54	54
Thu	54	55	55	55	56	56	56	57	57	57	57	57	57	56	57	56	56	56	56	55	55	54	54	54
Fri	53	52	52	51	50	49	48	48	47	46	46	46	45	45	45	44	44	44	44	44	44	43	43	43
Sat	43	43	44	44	45	46	46	47	48	48	49	49	49	50	50	50	51	51	51	52	52	52	52	52
Sun	52	52	52	52	51	51	50	50	49	48	47	47	46	46	45	45	44	44	43	43	43	42	41	41
Mon	41	40	40	40	39	39	39	39	39	39	39	39	39	39	39	39	40	40	41	41	41	41	42	41
Tue	41	40	40	40	40	40	41	41	41	40	41	41	41	41	42	43	43	44	44	44	44	43	42	42

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	50	51	51	51	51	51	51	51	51	51	51	52	52	52	52	52	52	53	53	53	53	53	54	54
Thu	54	55	55	55	56	56	56	57	57	57	57	57	57	56	57	56	56	56	56	55	55	54	54	54
Fri	53	52	52	51	50	49	48	48	47	46	46	46	45	45	45	44	44	44	44	44	44	43	43	43
Sat	43	43	44	44	45	46	46	47	48	48	49	49	49	50	50	50	51	51	51	52	52	52	52	52
Sun	52	52	52	52	51	51	50	50	49	48	47	47	46	46	45	45	44	44	43	43	43	42	41	41
Mon	41	40	40	40	39	39	39	39	39	39	39	39	39	39	39	39	40	40	41	41	41	41	42	41
Tue	41	40	40	40	40	40	41	41	41	40	41	41	41	41	42	43	43	44	44	44	44	43	42	42