14 – 20 Oct 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

61Weekly 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.

-1.4 AQI compared with the previous week’s mean of 62.4.

Highest hourly estimate: 246 in Bangkok · 16 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, 14 Oct	50.2Moderate	24–87	10.8	192 / 192
Thu, 15 Oct	66.1Moderate	28–212	15.4	192 / 192
Fri, 16 Oct	73.7Moderate	33–246	12.9	192 / 192
Sat, 17 Oct	69.4Moderate	41–244	13.9	192 / 192
Sun, 18 Oct	60.5Moderate	31–179	10.7	192 / 192
Mon, 19 Oct	53.6Moderate	25–165	10.4	192 / 192
Tue, 20 Oct	53.7Moderate	28–141	11.3	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	50	49	49	48	48	47	47	46	46	46	47	47	47	47	48	49	54	59	61	59	56	53	52	50
Thu	50	50	50	51	51	51	52	53	54	54	55	56	57	57	63	68	79	92	99	99	96	92	84	74
Fri	64	62	61	60	60	60	60	60	59	58	58	58	61	64	69	76	91	103	109	108	102	95	90	83
Sat	75	65	57	55	55	55	54	54	55	56	57	57	61	66	68	72	85	95	99	97	91	85	79	74
Sun	69	65	60	58	58	58	57	57	57	56	56	55	55	55	57	61	69	74	75	71	66	60	53	52
Mon	51	50	49	49	48	48	48	48	47	47	47	47	47	48	50	57	65	71	73	71	66	60	54	49
Tue	49	49	49	49	49	49	49	49	50	50	50	50	51	51	51	55	63	68	70	68	63	57	51	50

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	106.1Unhealthy for Sensitive Groups	246	21.9	168 / 168
Chiang Mai	73.7Moderate	132	18.2	168 / 168
Chiang Rai	55.6Moderate	83	11.7	168 / 168
Pattaya	55Moderate	180	7.4	168 / 168
Hat Yai	52.4Moderate	77	11.2	168 / 168
Phuket	51.9Moderate	132	8.3	168 / 168
Khon Kaen	48.6Good	65	10	168 / 168
Nakhon Ratchasima	44.9Good	60	8.8	168 / 168

City-hours by category

Good: 502

Moderate: 743

Unhealthy for Sensitive Groups: 60

Unhealthy: 20

Very Unhealthy: 19

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	50	49	49	48	48	47	47	46	46	46	47	47	47	47	48	49	54	59	61	59	56	53	52	50
Thu	50	50	50	51	51	51	52	53	54	54	55	56	57	57	63	68	79	92	99	99	96	92	84	74
Fri	64	62	61	60	60	60	60	60	59	58	58	58	61	64	69	76	91	103	109	108	102	95	90	83
Sat	75	65	57	55	55	55	54	54	55	56	57	57	61	66	68	72	85	95	99	97	91	85	79	74
Sun	69	65	60	58	58	58	57	57	57	56	56	55	55	55	57	61	69	74	75	71	66	60	53	52
Mon	51	50	49	49	48	48	48	48	47	47	47	47	47	48	50	57	65	71	73	71	66	60	54	49
Tue	49	49	49	49	49	49	49	49	50	50	50	50	51	51	51	55	63	68	70	68	63	57	51	50

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	50	49	49	48	48	47	47	46	46	46	47	47	47	47	48	49	54	59	61	59	56	53	52	50
Thu	50	50	50	51	51	51	52	53	54	54	55	56	57	57	63	68	79	92	99	99	96	92	84	74
Fri	64	62	61	60	60	60	60	60	59	58	58	58	61	64	69	76	91	103	109	108	102	95	90	83
Sat	75	65	57	55	55	55	54	54	55	56	57	57	61	66	68	72	85	95	99	97	91	85	79	74
Sun	69	65	60	58	58	58	57	57	57	56	56	55	55	55	57	61	69	74	75	71	66	60	53	52
Mon	51	50	49	49	48	48	48	48	47	47	47	47	47	48	50	57	65	71	73	71	66	60	54	49
Tue	49	49	49	49	49	49	49	49	50	50	50	50	51	51	51	55	63	68	70	68	63	57	51	50

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	50	49	49	48	48	47	47	46	46	46	47	47	47	47	48	49	54	59	61	59	56	53	52	50
Thu	50	50	50	51	51	51	52	53	54	54	55	56	57	57	63	68	79	92	99	99	96	92	84	74
Fri	64	62	61	60	60	60	60	60	59	58	58	58	61	64	69	76	91	103	109	108	102	95	90	83
Sat	75	65	57	55	55	55	54	54	55	56	57	57	61	66	68	72	85	95	99	97	91	85	79	74
Sun	69	65	60	58	58	58	57	57	57	56	56	55	55	55	57	61	69	74	75	71	66	60	53	52
Mon	51	50	49	49	48	48	48	48	47	47	47	47	47	48	50	57	65	71	73	71	66	60	54	49
Tue	49	49	49	49	49	49	49	49	50	50	50	50	51	51	51	55	63	68	70	68	63	57	51	50