4 – 10 Oct 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

49.7Weekly mean modelled AQI · Good

Mean PM2.5: 11.6 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+3.4 AQI compared with the previous week’s mean of 46.3.

Highest hourly estimate: 206 in Bangkok · 5 Oct, 19:00 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, 4 Oct	46.6Good	23–75	11.1	192 / 192
Thu, 5 Oct	56.9Moderate	26–206	14.7	192 / 192
Fri, 6 Oct	50.3Moderate	24–123	8.7	192 / 192
Sat, 7 Oct	43.1Good	23–60	8.9	192 / 192
Sun, 8 Oct	44.5Good	19–60	9.6	192 / 192
Mon, 9 Oct	46.9Good	18–65	11	192 / 192
Tue, 10 Oct	59.3Moderate	22–172	17.3	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	45	45	46	46	46	46	45	45	45	45	45	46	46	46	46	47	48	48	49	49	49	49	49	48
Thu	48	49	49	50	51	52	52	53	53	53	53	54	54	55	55	58	59	64	69	70	69	68	66	62
Fri	58	58	57	56	55	55	54	54	53	53	52	52	51	50	49	48	47	46	45	44	44	43	43	43
Sat	43	43	43	43	42	42	42	42	42	42	43	43	43	43	43	44	44	44	44	44	44	44	44	44
Sun	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	45	45	45	45	45	46	46	46
Mon	46	46	46	46	46	45	46	46	46	46	46	46	47	47	47	48	48	48	49	49	49	49	49	49
Tue	50	51	51	52	53	53	53	54	55	55	56	56	57	57	58	59	59	64	71	75	75	74	71	66

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
Bangkok	76.7Moderate	206	23	168 / 168
Chiang Mai	58.6Moderate	77	13.7	168 / 168
Nakhon Ratchasima	54.1Moderate	63	10.9	168 / 168
Khon Kaen	52Moderate	65	11	168 / 168
Pattaya	47.3Good	119	12.6	168 / 168
Hat Yai	42.6Good	69	9.8	168 / 168
Phuket	34.5Good	43	6.1	168 / 168
Chiang Rai	31.6Good	50	5.8	168 / 168

City-hours by category

Good: 623

Moderate: 691

Unhealthy for Sensitive Groups: 19

Unhealthy: 8

Very Unhealthy: 3

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	45	45	46	46	46	46	45	45	45	45	45	46	46	46	46	47	48	48	49	49	49	49	49	48
Thu	48	49	49	50	51	52	52	53	53	53	53	54	54	55	55	58	59	64	69	70	69	68	66	62
Fri	58	58	57	56	55	55	54	54	53	53	52	52	51	50	49	48	47	46	45	44	44	43	43	43
Sat	43	43	43	43	42	42	42	42	42	42	43	43	43	43	43	44	44	44	44	44	44	44	44	44
Sun	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	45	45	45	45	45	46	46	46
Mon	46	46	46	46	46	45	46	46	46	46	46	46	47	47	47	48	48	48	49	49	49	49	49	49
Tue	50	51	51	52	53	53	53	54	55	55	56	56	57	57	58	59	59	64	71	75	75	74	71	66

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	45	45	46	46	46	46	45	45	45	45	45	46	46	46	46	47	48	48	49	49	49	49	49	48
Thu	48	49	49	50	51	52	52	53	53	53	53	54	54	55	55	58	59	64	69	70	69	68	66	62
Fri	58	58	57	56	55	55	54	54	53	53	52	52	51	50	49	48	47	46	45	44	44	43	43	43
Sat	43	43	43	43	42	42	42	42	42	42	43	43	43	43	43	44	44	44	44	44	44	44	44	44
Sun	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	45	45	45	45	45	46	46	46
Mon	46	46	46	46	46	45	46	46	46	46	46	46	47	47	47	48	48	48	49	49	49	49	49	49
Tue	50	51	51	52	53	53	53	54	55	55	56	56	57	57	58	59	59	64	71	75	75	74	71	66

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	45	45	46	46	46	46	45	45	45	45	45	46	46	46	46	47	48	48	49	49	49	49	49	48
Thu	48	49	49	50	51	52	52	53	53	53	53	54	54	55	55	58	59	64	69	70	69	68	66	62
Fri	58	58	57	56	55	55	54	54	53	53	52	52	51	50	49	48	47	46	45	44	44	43	43	43
Sat	43	43	43	43	42	42	42	42	42	42	43	43	43	43	43	44	44	44	44	44	44	44	44	44
Sun	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	45	45	45	45	45	46	46	46
Mon	46	46	46	46	46	45	46	46	46	46	46	46	47	47	47	48	48	48	49	49	49	49	49	49
Tue	50	51	51	52	53	53	53	54	55	55	56	56	57	57	58	59	59	64	71	75	75	74	71	66