4 – 10 Feb 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

78.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 21.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+0.5 AQI compared with the previous week’s mean of 78.4.

Highest hourly estimate: 250 in Bangkok · 5 Feb, 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 Feb	71.8Moderate	35–176	19	192 / 192
Thu, 5 Feb	87.2Moderate	32–250	24.2	192 / 192
Fri, 6 Feb	84.6Moderate	41–206	20.6	192 / 192
Sat, 7 Feb	77.7Moderate	46–149	21.6	192 / 192
Sun, 8 Feb	74.1Moderate	44–128	20.6	192 / 192
Mon, 9 Feb	73.5Moderate	44–154	18.1	192 / 192
Tue, 10 Feb	83.2Moderate	43–225	23.7	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	64	64	65	65	66	65	64	64	64	64	65	65	65	65	65	66	72	87	95	96	92	87	82	77
Thu	77	76	75	74	72	71	71	72	73	73	74	75	77	80	86	92	102	114	120	118	114	107	103	99
Fri	93	85	80	79	79	78	78	77	76	76	75	75	75	74	75	80	94	106	111	108	102	94	84	79
Sat	76	73	72	72	72	72	72	72	72	72	73	73	73	73	73	77	86	96	101	98	90	81	76	74
Sun	73	74	74	73	73	73	73	73	72	72	71	71	71	71	71	71	75	81	84	83	79	76	73	73
Mon	72	72	72	71	71	71	71	70	70	70	69	69	69	69	68	69	73	80	86	87	85	82	78	73
Tue	73	72	72	71	71	71	71	72	72	74	75	75	76	76	78	83	92	101	107	108	106	103	101	98

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	111.7Unhealthy for Sensitive Groups	250	33.8	168 / 168
Chiang Mai	92.1Moderate	128	30.8	168 / 168
Pattaya	86.1Moderate	211	16.6	168 / 168
Chiang Rai	83Moderate	110	25.8	168 / 168
Nakhon Ratchasima	81.9Moderate	164	23.5	168 / 168
Khon Kaen	73.7Moderate	152	18.4	168 / 168
Hat Yai	53.7Moderate	65	11.7	168 / 168
Phuket	48.8Good	93	8.1	168 / 168

City-hours by category

Good: 187

Moderate: 974

Unhealthy for Sensitive Groups: 131

Unhealthy: 29

Very Unhealthy: 23

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	64	64	65	65	66	65	64	64	64	64	65	65	65	65	65	66	72	87	95	96	92	87	82	77
Thu	77	76	75	74	72	71	71	72	73	73	74	75	77	80	86	92	102	114	120	118	114	107	103	99
Fri	93	85	80	79	79	78	78	77	76	76	75	75	75	74	75	80	94	106	111	108	102	94	84	79
Sat	76	73	72	72	72	72	72	72	72	72	73	73	73	73	73	77	86	96	101	98	90	81	76	74
Sun	73	74	74	73	73	73	73	73	72	72	71	71	71	71	71	71	75	81	84	83	79	76	73	73
Mon	72	72	72	71	71	71	71	70	70	70	69	69	69	69	68	69	73	80	86	87	85	82	78	73
Tue	73	72	72	71	71	71	71	72	72	74	75	75	76	76	78	83	92	101	107	108	106	103	101	98

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	64	64	65	65	66	65	64	64	64	64	65	65	65	65	65	66	72	87	95	96	92	87	82	77
Thu	77	76	75	74	72	71	71	72	73	73	74	75	77	80	86	92	102	114	120	118	114	107	103	99
Fri	93	85	80	79	79	78	78	77	76	76	75	75	75	74	75	80	94	106	111	108	102	94	84	79
Sat	76	73	72	72	72	72	72	72	72	72	73	73	73	73	73	77	86	96	101	98	90	81	76	74
Sun	73	74	74	73	73	73	73	73	72	72	71	71	71	71	71	71	75	81	84	83	79	76	73	73
Mon	72	72	72	71	71	71	71	70	70	70	69	69	69	69	68	69	73	80	86	87	85	82	78	73
Tue	73	72	72	71	71	71	71	72	72	74	75	75	76	76	78	83	92	101	107	108	106	103	101	98

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	64	64	65	65	66	65	64	64	64	64	65	65	65	65	65	66	72	87	95	96	92	87	82	77
Thu	77	76	75	74	72	71	71	72	73	73	74	75	77	80	86	92	102	114	120	118	114	107	103	99
Fri	93	85	80	79	79	78	78	77	76	76	75	75	75	74	75	80	94	106	111	108	102	94	84	79
Sat	76	73	72	72	72	72	72	72	72	72	73	73	73	73	73	77	86	96	101	98	90	81	76	74
Sun	73	74	74	73	73	73	73	73	72	72	71	71	71	71	71	71	75	81	84	83	79	76	73	73
Mon	72	72	72	71	71	71	71	70	70	70	69	69	69	69	68	69	73	80	86	87	85	82	78	73
Tue	73	72	72	71	71	71	71	72	72	74	75	75	76	76	78	83	92	101	107	108	106	103	101	98