9 – 15 Aug 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

44.4Weekly mean modelled AQI · Good

Mean PM2.5: 9.7 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+2.7 AQI compared with the previous week’s mean of 41.7.

Highest hourly estimate: 90 in Nakhon Ratchasima · 10 Aug, 21:00 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 Aug	38.6Good	20–62	7.4	192 / 192
Thu, 10 Aug	39.9Good	19–90	8.6	192 / 192
Fri, 11 Aug	43.9Good	19–78	9.4	192 / 192
Sat, 12 Aug	45Good	18–69	9.6	192 / 192
Sun, 13 Aug	45.2Good	17–64	10.7	192 / 192
Mon, 14 Aug	50.3Moderate	19–68	11.2	192 / 192
Tue, 15 Aug	48.3Good	17–68	10.6	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	38	38	38	38	38	38	38	39	39	39	39	39	39	39	39	39	39	40	40	39	39	39	38	39
Thu	39	39	39	39	39	39	39	39	39	39	39	39	39	39	39	39	40	40	41	42	43	44	44	44
Fri	43	42	42	43	43	43	43	43	43	44	44	44	44	45	45	45	45	45	45	45	45	45	45	44
Sat	44	45	45	45	45	45	45	45	45	45	45	45	45	45	45	46	46	46	46	46	46	45	45	45
Sun	44	44	44	44	44	44	44	44	44	44	44	45	45	45	46	46	46	46	46	46	47	47	47	48
Mon	48	49	49	50	50	50	51	51	51	51	51	51	51	51	51	51	50	51	51	50	51	50	50	50
Tue	49	49	49	48	48	48	48	48	48	48	48	48	48	48	48	48	49	49	49	49	49	49	48	48

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
Nakhon Ratchasima	65.9Moderate	90	17.3	168 / 168
Khon Kaen	54Moderate	63	11.7	168 / 168
Chiang Mai	52.8Moderate	67	12.4	168 / 168
Chiang Rai	51.8Moderate	67	12.3	168 / 168
Phuket	43.6Good	54	8	168 / 168
Bangkok	39.7Good	52	7.4	168 / 168
Hat Yai	25.7Good	40	4.4	168 / 168
Pattaya	22Good	31	3.7	168 / 168

City-hours by category

Good: 716

Moderate: 628

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	38	38	38	38	38	38	38	39	39	39	39	39	39	39	39	39	39	40	40	39	39	39	38	39
Thu	39	39	39	39	39	39	39	39	39	39	39	39	39	39	39	39	40	40	41	42	43	44	44	44
Fri	43	42	42	43	43	43	43	43	43	44	44	44	44	45	45	45	45	45	45	45	45	45	45	44
Sat	44	45	45	45	45	45	45	45	45	45	45	45	45	45	45	46	46	46	46	46	46	45	45	45
Sun	44	44	44	44	44	44	44	44	44	44	44	45	45	45	46	46	46	46	46	46	47	47	47	48
Mon	48	49	49	50	50	50	51	51	51	51	51	51	51	51	51	51	50	51	51	50	51	50	50	50
Tue	49	49	49	48	48	48	48	48	48	48	48	48	48	48	48	48	49	49	49	49	49	49	48	48

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	38	38	38	38	38	38	38	39	39	39	39	39	39	39	39	39	39	40	40	39	39	39	38	39
Thu	39	39	39	39	39	39	39	39	39	39	39	39	39	39	39	39	40	40	41	42	43	44	44	44
Fri	43	42	42	43	43	43	43	43	43	44	44	44	44	45	45	45	45	45	45	45	45	45	45	44
Sat	44	45	45	45	45	45	45	45	45	45	45	45	45	45	45	46	46	46	46	46	46	45	45	45
Sun	44	44	44	44	44	44	44	44	44	44	44	45	45	45	46	46	46	46	46	46	47	47	47	48
Mon	48	49	49	50	50	50	51	51	51	51	51	51	51	51	51	51	50	51	51	50	51	50	50	50
Tue	49	49	49	48	48	48	48	48	48	48	48	48	48	48	48	48	49	49	49	49	49	49	48	48

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	38	38	38	38	38	38	38	39	39	39	39	39	39	39	39	39	39	40	40	39	39	39	38	39
Thu	39	39	39	39	39	39	39	39	39	39	39	39	39	39	39	39	40	40	41	42	43	44	44	44
Fri	43	42	42	43	43	43	43	43	43	44	44	44	44	45	45	45	45	45	45	45	45	45	45	44
Sat	44	45	45	45	45	45	45	45	45	45	45	45	45	45	45	46	46	46	46	46	46	45	45	45
Sun	44	44	44	44	44	44	44	44	44	44	44	45	45	45	46	46	46	46	46	46	47	47	47	48
Mon	48	49	49	50	50	50	51	51	51	51	51	51	51	51	51	51	50	51	51	50	51	50	50	50
Tue	49	49	49	48	48	48	48	48	48	48	48	48	48	48	48	48	49	49	49	49	49	49	48	48