11 – 17 Feb 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

78.6Weekly mean modelled AQI · Moderate

Mean PM2.5: 20.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-0.3 AQI compared with the previous week’s mean of 78.9.

Highest hourly estimate: 218 in Bangkok · 11 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, 11 Feb	93.4Moderate	41–218	25.7	192 / 192
Thu, 12 Feb	90.1Moderate	46–213	21.8	192 / 192
Fri, 13 Feb	72.5Moderate	40–193	16.8	192 / 192
Sat, 14 Feb	71.8Moderate	41–163	18.2	192 / 192
Sun, 15 Feb	71.5Moderate	47–161	17.4	192 / 192
Mon, 16 Feb	76.6Moderate	51–197	21.2	192 / 192
Tue, 17 Feb	74.3Moderate	51–144	19.8	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	94	93	92	91	89	87	84	81	81	81	81	82	83	86	92	102	110	114	114	111	108	102	94
Thu	93	92	92	92	93	93	94	95	94	94	93	92	91	89	88	87	90	91	92	90	88	85	81	76
Fri	75	73	72	71	70	69	68	67	66	65	64	63	63	62	63	67	75	87	93	92	88	82	76	71
Sat	66	64	64	65	65	65	65	65	66	66	67	67	67	67	68	70	79	92	96	93	86	79	73	69
Sun	67	67	67	67	66	66	66	66	65	65	65	64	64	64	64	67	78	92	97	95	88	80	71	65
Mon	66	66	67	68	68	69	69	70	70	71	71	72	72	72	72	76	85	97	102	99	94	87	81	77
Tue	73	73	73	73	73	72	72	72	72	71	71	71	71	71	71	71	77	84	87	86	81	76	72	70

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	119.1Unhealthy for Sensitive Groups	218	31.3	168 / 168
Pattaya	88.2Moderate	204	18.1	168 / 168
Chiang Rai	86.8Moderate	125	26.8	168 / 168
Chiang Mai	86.1Moderate	144	26.2	168 / 168
Nakhon Ratchasima	77.5Moderate	135	21.8	168 / 168
Khon Kaen	67Moderate	109	16.5	168 / 168
Phuket	53.1Moderate	93	10.8	168 / 168
Hat Yai	50.9Moderate	57	9.6	168 / 168

City-hours by category

Good: 153

Moderate: 993

Unhealthy for Sensitive Groups: 134

Unhealthy: 50

Very Unhealthy: 14

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	94	93	92	91	89	87	84	81	81	81	81	82	83	86	92	102	110	114	114	111	108	102	94
Thu	93	92	92	92	93	93	94	95	94	94	93	92	91	89	88	87	90	91	92	90	88	85	81	76
Fri	75	73	72	71	70	69	68	67	66	65	64	63	63	62	63	67	75	87	93	92	88	82	76	71
Sat	66	64	64	65	65	65	65	65	66	66	67	67	67	67	68	70	79	92	96	93	86	79	73	69
Sun	67	67	67	67	66	66	66	66	65	65	65	64	64	64	64	67	78	92	97	95	88	80	71	65
Mon	66	66	67	68	68	69	69	70	70	71	71	72	72	72	72	76	85	97	102	99	94	87	81	77
Tue	73	73	73	73	73	72	72	72	72	71	71	71	71	71	71	71	77	84	87	86	81	76	72	70

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	94	93	92	91	89	87	84	81	81	81	81	82	83	86	92	102	110	114	114	111	108	102	94
Thu	93	92	92	92	93	93	94	95	94	94	93	92	91	89	88	87	90	91	92	90	88	85	81	76
Fri	75	73	72	71	70	69	68	67	66	65	64	63	63	62	63	67	75	87	93	92	88	82	76	71
Sat	66	64	64	65	65	65	65	65	66	66	67	67	67	67	68	70	79	92	96	93	86	79	73	69
Sun	67	67	67	67	66	66	66	66	65	65	65	64	64	64	64	67	78	92	97	95	88	80	71	65
Mon	66	66	67	68	68	69	69	70	70	71	71	72	72	72	72	76	85	97	102	99	94	87	81	77
Tue	73	73	73	73	73	72	72	72	72	71	71	71	71	71	71	71	77	84	87	86	81	76	72	70

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	94	93	92	91	89	87	84	81	81	81	81	82	83	86	92	102	110	114	114	111	108	102	94
Thu	93	92	92	92	93	93	94	95	94	94	93	92	91	89	88	87	90	91	92	90	88	85	81	76
Fri	75	73	72	71	70	69	68	67	66	65	64	63	63	62	63	67	75	87	93	92	88	82	76	71
Sat	66	64	64	65	65	65	65	65	66	66	67	67	67	67	68	70	79	92	96	93	86	79	73	69
Sun	67	67	67	67	66	66	66	66	65	65	65	64	64	64	64	67	78	92	97	95	88	80	71	65
Mon	66	66	67	68	68	69	69	70	70	71	71	72	72	72	72	76	85	97	102	99	94	87	81	77
Tue	73	73	73	73	73	72	72	72	72	71	71	71	71	71	71	71	77	84	87	86	81	76	72	70