27 Sep – 3 Oct 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

46.3Weekly 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.

-19.5 AQI compared with the previous week’s mean of 65.8.

Highest hourly estimate: 94 in Hat Yai · 29 Sept, 18:00 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, 27 Sep	50.5Moderate	19–80	9	192 / 192
Thu, 28 Sep	38.2Good	15–75	6.9	192 / 192
Fri, 29 Sep	38.4Good	15–94	9.3	192 / 192
Sat, 30 Sep	48.7Good	23–78	11.1	192 / 192
Sun, 1 Oct	49.1Good	24–81	11.2	192 / 192
Mon, 2 Oct	51.4Moderate	26–74	10.9	192 / 192
Tue, 3 Oct	47.3Good	25–63	9.2	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	53	53	53	53	53	53	53	52	52	52	51	51	51	50	50	50	50	50	49	49	48	47	47	46
Thu	45	44	43	42	42	41	40	39	39	38	38	37	36	36	36	35	35	36	37	37	36	35	35	35
Fri	35	35	35	35	35	35	36	36	36	36	37	37	37	38	39	40	41	43	44	44	43	42	42	43
Sat	44	45	45	46	47	47	48	48	48	49	49	50	50	50	51	51	51	51	51	51	50	50	50	50
Sun	51	50	50	50	51	50	50	50	50	49	49	49	49	49	48	48	48	48	48	48	48	49	48	49
Mon	49	50	50	50	51	51	51	51	51	52	52	52	52	52	52	52	52	52	52	52	52	52	52	51
Tue	51	50	50	50	50	49	49	49	49	48	48	48	47	47	46	46	46	46	45	45	45	45	45	45

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	62Moderate	94	16.2	168 / 168
Chiang Mai	53.9Moderate	75	11.2	168 / 168
Khon Kaen	48.1Good	63	9.5	168 / 168
Nakhon Ratchasima	48.1Good	80	9.9	168 / 168
Bangkok	48Good	72	10.5	168 / 168
Phuket	44.6Good	57	8.3	168 / 168
Chiang Rai	36.3Good	55	6.3	168 / 168
Pattaya	29Good	49	5.3	168 / 168

City-hours by category

Good: 722

Moderate: 622

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	53	53	53	53	53	53	53	52	52	52	51	51	51	50	50	50	50	50	49	49	48	47	47	46
Thu	45	44	43	42	42	41	40	39	39	38	38	37	36	36	36	35	35	36	37	37	36	35	35	35
Fri	35	35	35	35	35	35	36	36	36	36	37	37	37	38	39	40	41	43	44	44	43	42	42	43
Sat	44	45	45	46	47	47	48	48	48	49	49	50	50	50	51	51	51	51	51	51	50	50	50	50
Sun	51	50	50	50	51	50	50	50	50	49	49	49	49	49	48	48	48	48	48	48	48	49	48	49
Mon	49	50	50	50	51	51	51	51	51	52	52	52	52	52	52	52	52	52	52	52	52	52	52	51
Tue	51	50	50	50	50	49	49	49	49	48	48	48	47	47	46	46	46	46	45	45	45	45	45	45

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	53	53	53	53	53	53	53	52	52	52	51	51	51	50	50	50	50	50	49	49	48	47	47	46
Thu	45	44	43	42	42	41	40	39	39	38	38	37	36	36	36	35	35	36	37	37	36	35	35	35
Fri	35	35	35	35	35	35	36	36	36	36	37	37	37	38	39	40	41	43	44	44	43	42	42	43
Sat	44	45	45	46	47	47	48	48	48	49	49	50	50	50	51	51	51	51	51	51	50	50	50	50
Sun	51	50	50	50	51	50	50	50	50	49	49	49	49	49	48	48	48	48	48	48	48	49	48	49
Mon	49	50	50	50	51	51	51	51	51	52	52	52	52	52	52	52	52	52	52	52	52	52	52	51
Tue	51	50	50	50	50	49	49	49	49	48	48	48	47	47	46	46	46	46	45	45	45	45	45	45

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	53	53	53	53	53	53	53	52	52	52	51	51	51	50	50	50	50	50	49	49	48	47	47	46
Thu	45	44	43	42	42	41	40	39	39	38	38	37	36	36	36	35	35	36	37	37	36	35	35	35
Fri	35	35	35	35	35	35	36	36	36	36	37	37	37	38	39	40	41	43	44	44	43	42	42	43
Sat	44	45	45	46	47	47	48	48	48	49	49	50	50	50	51	51	51	51	51	51	50	50	50	50
Sun	51	50	50	50	51	50	50	50	50	49	49	49	49	49	48	48	48	48	48	48	48	49	48	49
Mon	49	50	50	50	51	51	51	51	51	52	52	52	52	52	52	52	52	52	52	52	52	52	52	51
Tue	51	50	50	50	50	49	49	49	49	48	48	48	47	47	46	46	46	46	45	45	45	45	45	45