31 Dec 2025 – 6 Jan 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

74.8Weekly mean modelled AQI · Moderate

Mean PM2.5: 17.8 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+7.7 AQI compared with the previous week’s mean of 67.1.

Highest hourly estimate: 231 in Bangkok · 1 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, 31 Dec	89.4Moderate	54–211	22.5	192 / 192
Thu, 1 Jan	91.5Moderate	53–231	23.2	192 / 192
Fri, 2 Jan	80.7Moderate	49–196	19.8	192 / 192
Sat, 3 Jan	66.9Moderate	45–97	14.8	192 / 192
Sun, 4 Jan	64.9Moderate	37–119	15.9	192 / 192
Mon, 5 Jan	67.8Moderate	52–143	15.9	192 / 192
Tue, 6 Jan	62.5Moderate	42–116	12.8	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	84	83	82	82	82	82	81	79	79	79	79	79	79	79	79	81	92	107	116	118	115	109	103	98
Thu	92	86	81	77	75	74	73	73	73	74	75	77	79	83	89	97	107	120	126	125	118	112	108	102
Fri	95	91	89	87	85	82	79	78	77	77	77	76	76	75	75	75	79	83	86	85	83	79	75	74
Sat	72	71	70	69	68	68	68	68	67	66	66	65	65	64	64	64	66	70	72	71	68	63	61	61
Sun	61	60	60	60	60	61	61	61	61	61	62	62	62	63	63	65	68	78	82	80	74	67	64	63
Mon	63	63	63	63	63	62	63	62	63	63	63	63	63	63	64	66	73	84	89	88	82	74	67	65
Tue	64	63	63	63	62	62	62	62	61	61	60	59	59	58	59	60	64	70	74	72	65	62	60	59

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	112.4Unhealthy for Sensitive Groups	231	32.9	168 / 168
Chiang Mai	87.9Moderate	140	27.4	168 / 168
Pattaya	83.9Moderate	209	14.8	168 / 168
Chiang Rai	73.2Moderate	119	19.5	168 / 168
Phuket	65.2Moderate	112	13	168 / 168
Hat Yai	62.3Moderate	81	14.2	168 / 168
Khon Kaen	57.9Moderate	90	10.9	168 / 168
Nakhon Ratchasima	55.8Moderate	104	9.8	168 / 168

City-hours by category

Good: 96

Moderate: 1094

Unhealthy for Sensitive Groups: 111

Unhealthy: 24

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	84	83	82	82	82	82	81	79	79	79	79	79	79	79	79	81	92	107	116	118	115	109	103	98
Thu	92	86	81	77	75	74	73	73	73	74	75	77	79	83	89	97	107	120	126	125	118	112	108	102
Fri	95	91	89	87	85	82	79	78	77	77	77	76	76	75	75	75	79	83	86	85	83	79	75	74
Sat	72	71	70	69	68	68	68	68	67	66	66	65	65	64	64	64	66	70	72	71	68	63	61	61
Sun	61	60	60	60	60	61	61	61	61	61	62	62	62	63	63	65	68	78	82	80	74	67	64	63
Mon	63	63	63	63	63	62	63	62	63	63	63	63	63	63	64	66	73	84	89	88	82	74	67	65
Tue	64	63	63	63	62	62	62	62	61	61	60	59	59	58	59	60	64	70	74	72	65	62	60	59

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	84	83	82	82	82	82	81	79	79	79	79	79	79	79	79	81	92	107	116	118	115	109	103	98
Thu	92	86	81	77	75	74	73	73	73	74	75	77	79	83	89	97	107	120	126	125	118	112	108	102
Fri	95	91	89	87	85	82	79	78	77	77	77	76	76	75	75	75	79	83	86	85	83	79	75	74
Sat	72	71	70	69	68	68	68	68	67	66	66	65	65	64	64	64	66	70	72	71	68	63	61	61
Sun	61	60	60	60	60	61	61	61	61	61	62	62	62	63	63	65	68	78	82	80	74	67	64	63
Mon	63	63	63	63	63	62	63	62	63	63	63	63	63	63	64	66	73	84	89	88	82	74	67	65
Tue	64	63	63	63	62	62	62	62	61	61	60	59	59	58	59	60	64	70	74	72	65	62	60	59

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	84	83	82	82	82	82	81	79	79	79	79	79	79	79	79	81	92	107	116	118	115	109	103	98
Thu	92	86	81	77	75	74	73	73	73	74	75	77	79	83	89	97	107	120	126	125	118	112	108	102
Fri	95	91	89	87	85	82	79	78	77	77	77	76	76	75	75	75	79	83	86	85	83	79	75	74
Sat	72	71	70	69	68	68	68	68	67	66	66	65	65	64	64	64	66	70	72	71	68	63	61	61
Sun	61	60	60	60	60	61	61	61	61	61	62	62	62	63	63	65	68	78	82	80	74	67	64	63
Mon	63	63	63	63	63	62	63	62	63	63	63	63	63	63	64	66	73	84	89	88	82	74	67	65
Tue	64	63	63	63	62	62	62	62	61	61	60	59	59	58	59	60	64	70	74	72	65	62	60	59