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

Thailand weekly air quality

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

86.8Weekly mean modelled AQI · Moderate

Mean PM2.5: 24.6 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+15 AQI compared with the previous week’s mean of 71.8.

Highest hourly estimate: 219 in Bangkok · 14 Jan, 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 Jan	95.7Moderate	48–219	28.5	192 / 192
Thu, 15 Jan	96.1Moderate	53–205	25.1	192 / 192
Fri, 16 Jan	81.3Moderate	60–136	23.2	192 / 192
Sat, 17 Jan	81.7Moderate	52–153	24.1	192 / 192
Sun, 18 Jan	85.4Moderate	41–158	25.6	192 / 192
Mon, 19 Jan	85Moderate	50–135	23.4	192 / 192
Tue, 20 Jan	82.3Moderate	61–184	22.7	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	94	92	89	87	84	81	81	82	83	84	85	85	85	86	86	89	101	117	126	127	121	116	112	105
Thu	101	98	95	93	92	90	89	88	86	85	85	85	86	86	89	93	103	117	122	120	112	105	96	90
Fri	87	84	81	79	79	79	79	78	78	78	78	78	78	78	78	79	83	90	94	91	86	81	79	77
Sat	77	77	77	77	77	77	77	77	77	76	76	76	76	77	77	79	88	97	101	98	94	89	85	81
Sun	80	79	79	79	79	80	80	80	81	81	81	81	81	81	82	82	88	96	103	102	99	97	93	88
Mon	86	84	82	82	81	81	81	81	81	81	80	80	80	80	80	83	86	93	100	99	94	91	88	85
Tue	82	80	78	76	76	76	76	76	76	76	76	77	77	77	79	84	88	97	102	100	94	88	84	80

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	120Unhealthy for Sensitive Groups	219	35.7	168 / 168
Nakhon Ratchasima	100.4Unhealthy for Sensitive Groups	153	35.3	168 / 168
Khon Kaen	94.3Moderate	131	31	168 / 168
Pattaya	91.2Moderate	206	21.4	168 / 168
Chiang Mai	84.5Moderate	125	25.4	168 / 168
Chiang Rai	74.7Moderate	125	19.3	168 / 168
Phuket	66.3Moderate	117	12.6	168 / 168
Hat Yai	63Moderate	70	16.3	168 / 168

City-hours by category

Good: 29

Moderate: 1001

Unhealthy for Sensitive Groups: 259

Unhealthy: 42

Very Unhealthy: 13

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	94	92	89	87	84	81	81	82	83	84	85	85	85	86	86	89	101	117	126	127	121	116	112	105
Thu	101	98	95	93	92	90	89	88	86	85	85	85	86	86	89	93	103	117	122	120	112	105	96	90
Fri	87	84	81	79	79	79	79	78	78	78	78	78	78	78	78	79	83	90	94	91	86	81	79	77
Sat	77	77	77	77	77	77	77	77	77	76	76	76	76	77	77	79	88	97	101	98	94	89	85	81
Sun	80	79	79	79	79	80	80	80	81	81	81	81	81	81	82	82	88	96	103	102	99	97	93	88
Mon	86	84	82	82	81	81	81	81	81	81	80	80	80	80	80	83	86	93	100	99	94	91	88	85
Tue	82	80	78	76	76	76	76	76	76	76	76	77	77	77	79	84	88	97	102	100	94	88	84	80

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	94	92	89	87	84	81	81	82	83	84	85	85	85	86	86	89	101	117	126	127	121	116	112	105
Thu	101	98	95	93	92	90	89	88	86	85	85	85	86	86	89	93	103	117	122	120	112	105	96	90
Fri	87	84	81	79	79	79	79	78	78	78	78	78	78	78	78	79	83	90	94	91	86	81	79	77
Sat	77	77	77	77	77	77	77	77	77	76	76	76	76	77	77	79	88	97	101	98	94	89	85	81
Sun	80	79	79	79	79	80	80	80	81	81	81	81	81	81	82	82	88	96	103	102	99	97	93	88
Mon	86	84	82	82	81	81	81	81	81	81	80	80	80	80	80	83	86	93	100	99	94	91	88	85
Tue	82	80	78	76	76	76	76	76	76	76	76	77	77	77	79	84	88	97	102	100	94	88	84	80

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	94	92	89	87	84	81	81	82	83	84	85	85	85	86	86	89	101	117	126	127	121	116	112	105
Thu	101	98	95	93	92	90	89	88	86	85	85	85	86	86	89	93	103	117	122	120	112	105	96	90
Fri	87	84	81	79	79	79	79	78	78	78	78	78	78	78	78	79	83	90	94	91	86	81	79	77
Sat	77	77	77	77	77	77	77	77	77	76	76	76	76	77	77	79	88	97	101	98	94	89	85	81
Sun	80	79	79	79	79	80	80	80	81	81	81	81	81	81	82	82	88	96	103	102	99	97	93	88
Mon	86	84	82	82	81	81	81	81	81	81	80	80	80	80	80	83	86	93	100	99	94	91	88	85
Tue	82	80	78	76	76	76	76	76	76	76	76	77	77	77	79	84	88	97	102	100	94	88	84	80