13 – 19 Sep 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

46.1Weekly mean modelled AQI · Good

Mean PM2.5: 10.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+1.3 AQI compared with the previous week’s mean of 44.8.

Highest hourly estimate: 201 in Bangkok · 19 Sept, 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, 13 Sep	44.5Good	20–129	12.1	192 / 192
Thu, 14 Sep	53.9Moderate	17–85	10.5	192 / 192
Fri, 15 Sep	43.5Good	15–69	7.4	192 / 192
Sat, 16 Sep	41Good	16–57	7.7	192 / 192
Sun, 17 Sep	40.4Good	15–55	7	192 / 192
Mon, 18 Sep	42.2Good	16–89	8.6	192 / 192
Tue, 19 Sep	56.9Moderate	27–201	17.1	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	40	39	39	39	39	39	39	40	40	41	41	41	42	43	44	44	48	50	53	54	54	53	53	52
Thu	53	54	54	55	55	55	56	56	56	56	56	56	55	55	55	54	54	54	54	53	51	50	50	49
Fri	48	48	47	47	46	46	46	45	45	45	44	43	43	42	42	42	42	41	41	41	41	40	40	40
Sat	39	39	39	39	39	39	39	39	40	40	40	40	41	41	42	42	43	43	43	43	43	43	43	43
Sun	42	42	42	42	42	42	42	42	41	41	41	41	41	40	40	40	40	40	39	39	39	38	39	39
Mon	38	38	38	39	39	39	39	39	40	40	40	41	42	42	43	43	43	46	48	49	48	47	46	45
Tue	45	46	47	47	47	48	48	48	49	49	50	51	51	52	53	59	60	64	69	74	78	79	78	75

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	62.6Moderate	129	14.7	168 / 168
Chiang Mai	49.9Good	57	9.7	168 / 168
Phuket	49.2Good	85	11.3	168 / 168
Nakhon Ratchasima	48.4Good	61	10.4	168 / 168
Khon Kaen	44Good	67	9.2	168 / 168
Chiang Rai	43.9Good	52	8	168 / 168
Bangkok	41.7Good	201	10.5	168 / 168
Pattaya	28.8Good	126	6.8	168 / 168

City-hours by category

Good: 860

Moderate: 467

Unhealthy for Sensitive Groups: 12

Unhealthy: 4

Very Unhealthy: 1

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	40	39	39	39	39	39	39	40	40	41	41	41	42	43	44	44	48	50	53	54	54	53	53	52
Thu	53	54	54	55	55	55	56	56	56	56	56	56	55	55	55	54	54	54	54	53	51	50	50	49
Fri	48	48	47	47	46	46	46	45	45	45	44	43	43	42	42	42	42	41	41	41	41	40	40	40
Sat	39	39	39	39	39	39	39	39	40	40	40	40	41	41	42	42	43	43	43	43	43	43	43	43
Sun	42	42	42	42	42	42	42	42	41	41	41	41	41	40	40	40	40	40	39	39	39	38	39	39
Mon	38	38	38	39	39	39	39	39	40	40	40	41	42	42	43	43	43	46	48	49	48	47	46	45
Tue	45	46	47	47	47	48	48	48	49	49	50	51	51	52	53	59	60	64	69	74	78	79	78	75

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	40	39	39	39	39	39	39	40	40	41	41	41	42	43	44	44	48	50	53	54	54	53	53	52
Thu	53	54	54	55	55	55	56	56	56	56	56	56	55	55	55	54	54	54	54	53	51	50	50	49
Fri	48	48	47	47	46	46	46	45	45	45	44	43	43	42	42	42	42	41	41	41	41	40	40	40
Sat	39	39	39	39	39	39	39	39	40	40	40	40	41	41	42	42	43	43	43	43	43	43	43	43
Sun	42	42	42	42	42	42	42	42	41	41	41	41	41	40	40	40	40	40	39	39	39	38	39	39
Mon	38	38	38	39	39	39	39	39	40	40	40	41	42	42	43	43	43	46	48	49	48	47	46	45
Tue	45	46	47	47	47	48	48	48	49	49	50	51	51	52	53	59	60	64	69	74	78	79	78	75

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	40	39	39	39	39	39	39	40	40	41	41	41	42	43	44	44	48	50	53	54	54	53	53	52
Thu	53	54	54	55	55	55	56	56	56	56	56	56	55	55	55	54	54	54	54	53	51	50	50	49
Fri	48	48	47	47	46	46	46	45	45	45	44	43	43	42	42	42	42	41	41	41	41	40	40	40
Sat	39	39	39	39	39	39	39	39	40	40	40	40	41	41	42	42	43	43	43	43	43	43	43	43
Sun	42	42	42	42	42	42	42	42	41	41	41	41	41	40	40	40	40	40	39	39	39	38	39	39
Mon	38	38	38	39	39	39	39	39	40	40	40	41	42	42	43	43	43	46	48	49	48	47	46	45
Tue	45	46	47	47	47	48	48	48	49	49	50	51	51	52	53	59	60	64	69	74	78	79	78	75