28 Oct – 3 Nov 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

53Weekly mean modelled AQI · Moderate

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.

-4.7 AQI compared with the previous week’s mean of 57.7.

Highest hourly estimate: 225 in Bangkok · 2 Nov, 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, 28 Oct	50.7Moderate	26–94	8.7	192 / 192
Thu, 29 Oct	49.1Good	25–158	9.2	192 / 192
Fri, 30 Oct	46.6Good	24–113	9.7	192 / 192
Sat, 31 Oct	50.3Moderate	27–161	8.5	192 / 192
Sun, 1 Nov	52.8Moderate	25–190	11.7	192 / 192
Mon, 2 Nov	60.4Moderate	29–225	11.2	192 / 192
Tue, 3 Nov	61Moderate	30–219	11.9	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	52	52	52	51	51	52	52	52	51	50	50	49	49	49	49	49	53	58	58	54	49	47	45	45
Thu	44	44	43	43	44	43	44	44	44	44	44	44	45	46	47	48	56	66	69	67	61	55	49	45
Fri	44	44	44	43	43	43	42	42	42	42	43	43	43	43	44	46	52	60	62	59	54	49	45	46
Sat	46	46	46	46	46	45	45	45	44	44	43	43	43	43	44	51	62	70	73	70	64	57	49	43
Sun	42	41	41	41	42	42	42	42	43	45	46	47	48	50	51	55	64	75	79	77	71	67	61	56
Mon	53	53	52	52	52	51	51	51	50	50	50	49	49	55	56	62	72	82	87	86	80	74	70	64
Tue	58	53	51	51	51	52	52	52	52	52	52	52	52	53	56	65	77	85	88	85	78	71	67	62

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	100.1Unhealthy for Sensitive Groups	225	24.1	168 / 168
Chiang Mai	67.2Moderate	161	13.4	168 / 168
Pattaya	54.1Moderate	110	9.2	168 / 168
Chiang Rai	50Good	80	9.2	168 / 168
Khon Kaen	44.1Good	71	7.8	168 / 168
Nakhon Ratchasima	39.9Good	58	6.7	168 / 168
Phuket	35.5Good	74	4.9	168 / 168
Hat Yai	33Good	41	5.7	168 / 168

City-hours by category

Good: 790

Moderate: 485

Unhealthy for Sensitive Groups: 42

Unhealthy: 15

Very Unhealthy: 12

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	52	52	52	51	51	52	52	52	51	50	50	49	49	49	49	49	53	58	58	54	49	47	45	45
Thu	44	44	43	43	44	43	44	44	44	44	44	44	45	46	47	48	56	66	69	67	61	55	49	45
Fri	44	44	44	43	43	43	42	42	42	42	43	43	43	43	44	46	52	60	62	59	54	49	45	46
Sat	46	46	46	46	46	45	45	45	44	44	43	43	43	43	44	51	62	70	73	70	64	57	49	43
Sun	42	41	41	41	42	42	42	42	43	45	46	47	48	50	51	55	64	75	79	77	71	67	61	56
Mon	53	53	52	52	52	51	51	51	50	50	50	49	49	55	56	62	72	82	87	86	80	74	70	64
Tue	58	53	51	51	51	52	52	52	52	52	52	52	52	53	56	65	77	85	88	85	78	71	67	62

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	52	52	52	51	51	52	52	52	51	50	50	49	49	49	49	49	53	58	58	54	49	47	45	45
Thu	44	44	43	43	44	43	44	44	44	44	44	44	45	46	47	48	56	66	69	67	61	55	49	45
Fri	44	44	44	43	43	43	42	42	42	42	43	43	43	43	44	46	52	60	62	59	54	49	45	46
Sat	46	46	46	46	46	45	45	45	44	44	43	43	43	43	44	51	62	70	73	70	64	57	49	43
Sun	42	41	41	41	42	42	42	42	43	45	46	47	48	50	51	55	64	75	79	77	71	67	61	56
Mon	53	53	52	52	52	51	51	51	50	50	50	49	49	55	56	62	72	82	87	86	80	74	70	64
Tue	58	53	51	51	51	52	52	52	52	52	52	52	52	53	56	65	77	85	88	85	78	71	67	62

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	52	52	52	51	51	52	52	52	51	50	50	49	49	49	49	49	53	58	58	54	49	47	45	45
Thu	44	44	43	43	44	43	44	44	44	44	44	44	45	46	47	48	56	66	69	67	61	55	49	45
Fri	44	44	44	43	43	43	42	42	42	42	43	43	43	43	44	46	52	60	62	59	54	49	45	46
Sat	46	46	46	46	46	45	45	45	44	44	43	43	43	43	44	51	62	70	73	70	64	57	49	43
Sun	42	41	41	41	42	42	42	42	43	45	46	47	48	50	51	55	64	75	79	77	71	67	61	56
Mon	53	53	52	52	52	51	51	51	50	50	50	49	49	55	56	62	72	82	87	86	80	74	70	64
Tue	58	53	51	51	51	52	52	52	52	52	52	52	52	53	56	65	77	85	88	85	78	71	67	62