18 – 24 Feb 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

79.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 23.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+1.3 AQI compared with the previous week’s mean of 78.6.

Highest hourly estimate: 203 in Bangkok · 18 Feb, 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, 18 Feb	76.6Moderate	49–203	22.3	192 / 192
Thu, 19 Feb	79.9Moderate	38–150	22.5	192 / 192
Fri, 20 Feb	71.1Moderate	35–138	18.7	192 / 192
Sat, 21 Feb	80.1Moderate	41–202	22.2	192 / 192
Sun, 22 Feb	82.8Moderate	51–162	23.5	192 / 192
Mon, 23 Feb	84.9Moderate	57–137	27.7	192 / 192
Tue, 24 Feb	83.9Moderate	56–136	25	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	70	70	70	70	70	71	71	71	71	71	71	71	72	72	72	76	79	86	90	92	90	90	88	85
Thu	80	77	77	78	78	79	79	80	81	81	81	81	81	81	80	80	80	81	82	82	81	81	80	78
Fri	77	75	73	73	72	71	71	70	70	69	69	68	68	68	68	68	70	75	78	77	73	70	68	68
Sat	68	68	69	69	70	70	71	71	72	73	73	73	74	74	75	78	83	95	103	104	102	99	95	92
Sun	87	82	78	75	75	75	74	74	74	74	74	74	74	75	76	83	93	103	107	106	100	93	85	79
Mon	78	79	79	80	81	82	82	83	84	84	85	85	85	85	85	85	88	93	94	92	89	88	87	87
Tue	86	86	86	85	85	85	84	84	84	84	84	84	83	83	83	83	82	85	87	86	83	81	81	81

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	113.4Unhealthy for Sensitive Groups	203	35.3	168 / 168
Chiang Mai	101.7Unhealthy for Sensitive Groups	158	34	168 / 168
Chiang Rai	88.3Moderate	97	29.5	168 / 168
Pattaya	80.5Moderate	202	20.2	168 / 168
Nakhon Ratchasima	75.2Moderate	147	20.8	168 / 168
Khon Kaen	73.8Moderate	137	22	168 / 168
Hat Yai	55.2Moderate	73	12.9	168 / 168
Phuket	51.3Moderate	86	10.4	168 / 168

City-hours by category

Good: 190

Moderate: 897

Unhealthy for Sensitive Groups: 230

Unhealthy: 22

Very Unhealthy: 5

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	70	70	70	70	70	71	71	71	71	71	71	71	72	72	72	76	79	86	90	92	90	90	88	85
Thu	80	77	77	78	78	79	79	80	81	81	81	81	81	81	80	80	80	81	82	82	81	81	80	78
Fri	77	75	73	73	72	71	71	70	70	69	69	68	68	68	68	68	70	75	78	77	73	70	68	68
Sat	68	68	69	69	70	70	71	71	72	73	73	73	74	74	75	78	83	95	103	104	102	99	95	92
Sun	87	82	78	75	75	75	74	74	74	74	74	74	74	75	76	83	93	103	107	106	100	93	85	79
Mon	78	79	79	80	81	82	82	83	84	84	85	85	85	85	85	85	88	93	94	92	89	88	87	87
Tue	86	86	86	85	85	85	84	84	84	84	84	84	83	83	83	83	82	85	87	86	83	81	81	81

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	70	70	70	70	70	71	71	71	71	71	71	71	72	72	72	76	79	86	90	92	90	90	88	85
Thu	80	77	77	78	78	79	79	80	81	81	81	81	81	81	80	80	80	81	82	82	81	81	80	78
Fri	77	75	73	73	72	71	71	70	70	69	69	68	68	68	68	68	70	75	78	77	73	70	68	68
Sat	68	68	69	69	70	70	71	71	72	73	73	73	74	74	75	78	83	95	103	104	102	99	95	92
Sun	87	82	78	75	75	75	74	74	74	74	74	74	74	75	76	83	93	103	107	106	100	93	85	79
Mon	78	79	79	80	81	82	82	83	84	84	85	85	85	85	85	85	88	93	94	92	89	88	87	87
Tue	86	86	86	85	85	85	84	84	84	84	84	84	83	83	83	83	82	85	87	86	83	81	81	81

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	70	70	70	70	70	71	71	71	71	71	71	71	72	72	72	76	79	86	90	92	90	90	88	85
Thu	80	77	77	78	78	79	79	80	81	81	81	81	81	81	80	80	80	81	82	82	81	81	80	78
Fri	77	75	73	73	72	71	71	70	70	69	69	68	68	68	68	68	70	75	78	77	73	70	68	68
Sat	68	68	69	69	70	70	71	71	72	73	73	73	74	74	75	78	83	95	103	104	102	99	95	92
Sun	87	82	78	75	75	75	74	74	74	74	74	74	74	75	76	83	93	103	107	106	100	93	85	79
Mon	78	79	79	80	81	82	82	83	84	84	85	85	85	85	85	85	88	93	94	92	89	88	87	87
Tue	86	86	86	85	85	85	84	84	84	84	84	84	83	83	83	83	82	85	87	86	83	81	81	81