6 – 12 Sep 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

44.8Weekly mean modelled AQI · Good

Mean PM2.5: 8.9 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-3.8 AQI compared with the previous week’s mean of 48.6.

Highest hourly estimate: 70 in Hat Yai · 12 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, 6 Sep	42.9Good	16–60	9.2	192 / 192
Thu, 7 Sep	50.4Moderate	24–64	10.8	192 / 192
Fri, 8 Sep	48.2Good	18–63	9.7	192 / 192
Sat, 9 Sep	46.1Good	17–62	8.8	192 / 192
Sun, 10 Sep	43.5Good	17–62	8.1	192 / 192
Mon, 11 Sep	41.7Good	17–63	7.9	192 / 192
Tue, 12 Sep	40.8Good	17–70	7.8	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	40	41	41	41	41	41	41	42	42	42	42	43	43	43	44	44	45	45	45	45	46	46	47
Thu	48	48	49	49	50	50	50	50	51	50	51	51	51	51	51	51	51	52	51	52	52	51	51	51
Fri	50	50	50	49	49	48	48	48	48	48	47	47	47	47	48	48	48	48	48	48	48	48	48	48
Sat	48	47	47	47	47	47	46	47	47	47	46	46	47	46	46	46	46	46	45	45	45	45	45	44
Sun	44	45	45	45	45	45	44	44	44	44	44	44	43	43	43	43	43	43	43	43	43	42	42	42
Mon	41	41	41	41	41	42	42	42	41	41	41	41	42	42	42	42	42	43	43	43	42	42	42	41
Tue	41	40	41	41	40	41	40	40	41	41	41	41	41	41	41	41	41	42	42	42	41	40	40	40

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
Khon Kaen	56Moderate	64	12.3	168 / 168
Nakhon Ratchasima	53.6Moderate	62	11.2	168 / 168
Chiang Mai	53.1Moderate	60	10.6	168 / 168
Phuket	47.8Good	52	8.6	168 / 168
Hat Yai	45.7Good	70	9.8	168 / 168
Chiang Rai	40.7Good	52	7.3	168 / 168
Bangkok	39.6Good	62	7.7	168 / 168
Pattaya	21.6Good	32	3.4	168 / 168

City-hours by category

Good: 739

Moderate: 605

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	40	40	41	41	41	41	41	41	42	42	42	42	43	43	43	44	44	45	45	45	45	46	46	47
Thu	48	48	49	49	50	50	50	50	51	50	51	51	51	51	51	51	51	52	51	52	52	51	51	51
Fri	50	50	50	49	49	48	48	48	48	48	47	47	47	47	48	48	48	48	48	48	48	48	48	48
Sat	48	47	47	47	47	47	46	47	47	47	46	46	47	46	46	46	46	46	45	45	45	45	45	44
Sun	44	45	45	45	45	45	44	44	44	44	44	44	43	43	43	43	43	43	43	43	43	42	42	42
Mon	41	41	41	41	41	42	42	42	41	41	41	41	42	42	42	42	42	43	43	43	42	42	42	41
Tue	41	40	41	41	40	41	40	40	41	41	41	41	41	41	41	41	41	42	42	42	41	40	40	40

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	40	41	41	41	41	41	41	42	42	42	42	43	43	43	44	44	45	45	45	45	46	46	47
Thu	48	48	49	49	50	50	50	50	51	50	51	51	51	51	51	51	51	52	51	52	52	51	51	51
Fri	50	50	50	49	49	48	48	48	48	48	47	47	47	47	48	48	48	48	48	48	48	48	48	48
Sat	48	47	47	47	47	47	46	47	47	47	46	46	47	46	46	46	46	46	45	45	45	45	45	44
Sun	44	45	45	45	45	45	44	44	44	44	44	44	43	43	43	43	43	43	43	43	43	42	42	42
Mon	41	41	41	41	41	42	42	42	41	41	41	41	42	42	42	42	42	43	43	43	42	42	42	41
Tue	41	40	41	41	40	41	40	40	41	41	41	41	41	41	41	41	41	42	42	42	41	40	40	40

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	40	41	41	41	41	41	41	42	42	42	42	43	43	43	44	44	45	45	45	45	46	46	47
Thu	48	48	49	49	50	50	50	50	51	50	51	51	51	51	51	51	51	52	51	52	52	51	51	51
Fri	50	50	50	49	49	48	48	48	48	48	47	47	47	47	48	48	48	48	48	48	48	48	48	48
Sat	48	47	47	47	47	47	46	47	47	47	46	46	47	46	46	46	46	46	45	45	45	45	45	44
Sun	44	45	45	45	45	45	44	44	44	44	44	44	43	43	43	43	43	43	43	43	43	42	42	42
Mon	41	41	41	41	41	42	42	42	41	41	41	41	42	42	42	42	42	43	43	43	42	42	42	41
Tue	41	40	41	41	40	41	40	40	41	41	41	41	41	41	41	41	41	42	42	42	41	40	40	40