29 Nov – 5 Dec 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

52.6Weekly mean modelled AQI · Moderate

Mean PM2.5: 12.2 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-6.2 AQI compared with the previous week’s mean of 58.8.

Highest hourly estimate: 176 in Bangkok · 5 Dec, 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, 29 Nov	63.1Moderate	28–138	17.3	192 / 192
Thu, 30 Nov	64.9Moderate	28–98	16.4	192 / 192
Fri, 1 Dec	55.2Moderate	27–95	11.4	192 / 192
Sat, 2 Dec	48.4Good	21–77	9.3	192 / 192
Sun, 3 Dec	44.1Good	22–69	8.2	192 / 192
Mon, 4 Dec	40.6Good	24–68	9.2	192 / 192
Tue, 5 Dec	51.7Moderate	22–176	14	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	58	58	59	59	59	60	60	60	61	61	62	62	63	63	64	64	66	71	72	71	68	65	65	65
Thu	66	66	66	66	66	66	66	66	66	66	65	65	65	64	64	64	64	65	66	65	64	62	62	62
Fri	61	61	61	60	60	60	59	58	58	57	56	55	54	54	53	53	53	53	52	51	50	49	49	48
Sat	48	48	48	48	47	47	47	47	46	46	46	47	47	48	49	50	51	52	52	52	50	50	49	48
Sun	47	46	46	45	45	44	44	44	43	43	42	42	43	43	44	44	45	46	46	46	44	43	42	41
Mon	40	39	39	39	38	38	38	38	39	39	39	39	40	40	41	42	43	44	44	44	43	43	42	42
Tue	43	43	44	44	45	45	46	47	47	47	48	48	49	50	50	51	54	62	67	69	68	64	57	55

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	82.1Moderate	176	25.7	168 / 168
Chiang Mai	72.5Moderate	92	20.6	168 / 168
Chiang Rai	53.5Moderate	67	11.6	168 / 168
Pattaya	47.3Good	101	10	168 / 168
Khon Kaen	46.3Good	69	8.6	168 / 168
Nakhon Ratchasima	41.8Good	69	7.5	168 / 168
Hat Yai	41.7Good	52	7.5	168 / 168
Phuket	35.3Good	52	6.2	168 / 168

City-hours by category

Good: 657

Moderate: 673

Unhealthy for Sensitive Groups: 10

Unhealthy: 4

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	58	58	59	59	59	60	60	60	61	61	62	62	63	63	64	64	66	71	72	71	68	65	65	65
Thu	66	66	66	66	66	66	66	66	66	66	65	65	65	64	64	64	64	65	66	65	64	62	62	62
Fri	61	61	61	60	60	60	59	58	58	57	56	55	54	54	53	53	53	53	52	51	50	49	49	48
Sat	48	48	48	48	47	47	47	47	46	46	46	47	47	48	49	50	51	52	52	52	50	50	49	48
Sun	47	46	46	45	45	44	44	44	43	43	42	42	43	43	44	44	45	46	46	46	44	43	42	41
Mon	40	39	39	39	38	38	38	38	39	39	39	39	40	40	41	42	43	44	44	44	43	43	42	42
Tue	43	43	44	44	45	45	46	47	47	47	48	48	49	50	50	51	54	62	67	69	68	64	57	55

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	58	58	59	59	59	60	60	60	61	61	62	62	63	63	64	64	66	71	72	71	68	65	65	65
Thu	66	66	66	66	66	66	66	66	66	66	65	65	65	64	64	64	64	65	66	65	64	62	62	62
Fri	61	61	61	60	60	60	59	58	58	57	56	55	54	54	53	53	53	53	52	51	50	49	49	48
Sat	48	48	48	48	47	47	47	47	46	46	46	47	47	48	49	50	51	52	52	52	50	50	49	48
Sun	47	46	46	45	45	44	44	44	43	43	42	42	43	43	44	44	45	46	46	46	44	43	42	41
Mon	40	39	39	39	38	38	38	38	39	39	39	39	40	40	41	42	43	44	44	44	43	43	42	42
Tue	43	43	44	44	45	45	46	47	47	47	48	48	49	50	50	51	54	62	67	69	68	64	57	55

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	58	58	59	59	59	60	60	60	61	61	62	62	63	63	64	64	66	71	72	71	68	65	65	65
Thu	66	66	66	66	66	66	66	66	66	66	65	65	65	64	64	64	64	65	66	65	64	62	62	62
Fri	61	61	61	60	60	60	59	58	58	57	56	55	54	54	53	53	53	53	52	51	50	49	49	48
Sat	48	48	48	48	47	47	47	47	46	46	46	47	47	48	49	50	51	52	52	52	50	50	49	48
Sun	47	46	46	45	45	44	44	44	43	43	42	42	43	43	44	44	45	46	46	46	44	43	42	41
Mon	40	39	39	39	38	38	38	38	39	39	39	39	40	40	41	42	43	44	44	44	43	43	42	42
Tue	43	43	44	44	45	45	46	47	47	47	48	48	49	50	50	51	54	62	67	69	68	64	57	55