25 – 31 Oct 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

57Weekly mean modelled AQI · Moderate

Mean PM2.5: 13.2 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-17.2 AQI compared with the previous week’s mean of 74.2.

Highest hourly estimate: 254 in Bangkok · 28 Oct, 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, 25 Oct	67.1Moderate	25–204	15.5	192 / 192
Thu, 26 Oct	61.7Moderate	32–193	13.8	192 / 192
Fri, 27 Oct	53.8Moderate	27–145	10.9	192 / 192
Sat, 28 Oct	57.6Moderate	25–254	16.2	192 / 192
Sun, 29 Oct	63.6Moderate	23–221	18.3	192 / 192
Mon, 30 Oct	53.5Moderate	26–164	8.6	192 / 192
Tue, 31 Oct	41.9Good	26–77	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	73	68	68	67	66	65	65	64	64	63	63	63	63	63	64	64	64	71	77	78	77	73	67	60
Thu	60	61	61	61	61	62	62	62	61	60	60	60	59	59	59	59	60	65	68	69	68	65	62	57
Fri	56	56	56	55	55	55	55	55	55	55	55	54	54	54	54	54	54	54	54	53	52	50	49	49
Sat	49	48	48	48	48	48	48	48	49	49	49	49	50	57	60	63	65	69	71	73	74	74	73	72
Sun	70	68	63	63	63	63	63	63	63	63	63	63	63	63	63	63	63	62	62	63	65	66	65	62
Mon	60	60	60	59	59	58	58	57	57	56	55	55	54	53	52	52	51	51	50	49	47	45	43	42
Tue	41	40	40	39	39	39	38	38	38	38	38	38	39	41	42	44	46	48	49	49	47	46	45	46

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	135.1Unhealthy for Sensitive Groups	254	42.6	168 / 168
Pattaya	61.6Moderate	129	13.3	168 / 168
Chiang Mai	61.5Moderate	84	14.6	168 / 168
Nakhon Ratchasima	45.1Good	57	8.3	168 / 168
Khon Kaen	44.7Good	76	7.7	168 / 168
Chiang Rai	39.3Good	52	7.3	168 / 168
Hat Yai	36.3Good	51	6.4	168 / 168
Phuket	32.5Good	49	5.5	168 / 168

City-hours by category

Good: 798

Moderate: 416

Unhealthy for Sensitive Groups: 56

Unhealthy: 63

Very Unhealthy: 11

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	73	68	68	67	66	65	65	64	64	63	63	63	63	63	64	64	64	71	77	78	77	73	67	60
Thu	60	61	61	61	61	62	62	62	61	60	60	60	59	59	59	59	60	65	68	69	68	65	62	57
Fri	56	56	56	55	55	55	55	55	55	55	55	54	54	54	54	54	54	54	54	53	52	50	49	49
Sat	49	48	48	48	48	48	48	48	49	49	49	49	50	57	60	63	65	69	71	73	74	74	73	72
Sun	70	68	63	63	63	63	63	63	63	63	63	63	63	63	63	63	63	62	62	63	65	66	65	62
Mon	60	60	60	59	59	58	58	57	57	56	55	55	54	53	52	52	51	51	50	49	47	45	43	42
Tue	41	40	40	39	39	39	38	38	38	38	38	38	39	41	42	44	46	48	49	49	47	46	45	46

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	73	68	68	67	66	65	65	64	64	63	63	63	63	63	64	64	64	71	77	78	77	73	67	60
Thu	60	61	61	61	61	62	62	62	61	60	60	60	59	59	59	59	60	65	68	69	68	65	62	57
Fri	56	56	56	55	55	55	55	55	55	55	55	54	54	54	54	54	54	54	54	53	52	50	49	49
Sat	49	48	48	48	48	48	48	48	49	49	49	49	50	57	60	63	65	69	71	73	74	74	73	72
Sun	70	68	63	63	63	63	63	63	63	63	63	63	63	63	63	63	63	62	62	63	65	66	65	62
Mon	60	60	60	59	59	58	58	57	57	56	55	55	54	53	52	52	51	51	50	49	47	45	43	42
Tue	41	40	40	39	39	39	38	38	38	38	38	38	39	41	42	44	46	48	49	49	47	46	45	46

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	73	68	68	67	66	65	65	64	64	63	63	63	63	63	64	64	64	71	77	78	77	73	67	60
Thu	60	61	61	61	61	62	62	62	61	60	60	60	59	59	59	59	60	65	68	69	68	65	62	57
Fri	56	56	56	55	55	55	55	55	55	55	55	54	54	54	54	54	54	54	54	53	52	50	49	49
Sat	49	48	48	48	48	48	48	48	49	49	49	49	50	57	60	63	65	69	71	73	74	74	73	72
Sun	70	68	63	63	63	63	63	63	63	63	63	63	63	63	63	63	63	62	62	63	65	66	65	62
Mon	60	60	60	59	59	58	58	57	57	56	55	55	54	53	52	52	51	51	50	49	47	45	43	42
Tue	41	40	40	39	39	39	38	38	38	38	38	38	39	41	42	44	46	48	49	49	47	46	45	46