7 – 13 Jan 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

71.8Weekly mean modelled AQI · Moderate

Mean PM2.5: 18 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-3 AQI compared with the previous week’s mean of 74.8.

Highest hourly estimate: 215 in Bangkok · 13 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, 7 Jan	58.5Moderate	32–124	12	192 / 192
Thu, 8 Jan	61.3Moderate	42–117	13.6	192 / 192
Fri, 9 Jan	66.1Moderate	36–140	17.8	192 / 192
Sat, 10 Jan	75.1Moderate	47–154	17.1	192 / 192
Sun, 11 Jan	71.5Moderate	52–126	19.9	192 / 192
Mon, 12 Jan	82.4Moderate	52–182	21.4	192 / 192
Tue, 13 Jan	87.9Moderate	51–215	24.1	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	57	56	55	54	53	53	52	52	51	51	51	51	51	52	53	55	61	69	76	78	76	72	67	61
Thu	58	57	56	56	56	56	57	58	58	58	58	59	59	59	60	61	64	70	74	74	71	68	64	62
Fri	61	60	60	60	59	59	58	57	57	58	58	59	60	61	63	65	71	82	88	88	84	79	72	69
Sat	69	70	70	70	70	70	69	69	69	69	68	68	69	69	71	73	80	92	99	98	93	86	76	68
Sun	66	66	65	65	65	65	65	65	65	65	65	66	66	67	69	73	79	88	92	89	83	78	75	73
Mon	72	71	72	72	73	73	74	74	74	74	74	74	74	74	75	78	85	99	108	109	108	104	98	91
Tue	85	81	79	78	75	75	75	75	75	76	76	76	77	77	78	83	95	110	117	118	115	110	106	100

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	97.9Moderate	215	29.8	168 / 168
Chiang Mai	93.9Moderate	164	28.7	168 / 168
Pattaya	74.4Moderate	203	15.6	168 / 168
Khon Kaen	64.9Moderate	88	17.6	168 / 168
Nakhon Ratchasima	62.7Moderate	86	15.3	168 / 168
Hat Yai	62.2Moderate	92	12.7	168 / 168
Chiang Rai	59.7Moderate	95	14.2	168 / 168
Phuket	59Moderate	97	9.9	168 / 168

City-hours by category

Good: 161

Moderate: 1075

Unhealthy for Sensitive Groups: 79

Unhealthy: 21

Very Unhealthy: 8

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	57	56	55	54	53	53	52	52	51	51	51	51	51	52	53	55	61	69	76	78	76	72	67	61
Thu	58	57	56	56	56	56	57	58	58	58	58	59	59	59	60	61	64	70	74	74	71	68	64	62
Fri	61	60	60	60	59	59	58	57	57	58	58	59	60	61	63	65	71	82	88	88	84	79	72	69
Sat	69	70	70	70	70	70	69	69	69	69	68	68	69	69	71	73	80	92	99	98	93	86	76	68
Sun	66	66	65	65	65	65	65	65	65	65	65	66	66	67	69	73	79	88	92	89	83	78	75	73
Mon	72	71	72	72	73	73	74	74	74	74	74	74	74	74	75	78	85	99	108	109	108	104	98	91
Tue	85	81	79	78	75	75	75	75	75	76	76	76	77	77	78	83	95	110	117	118	115	110	106	100

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	57	56	55	54	53	53	52	52	51	51	51	51	51	52	53	55	61	69	76	78	76	72	67	61
Thu	58	57	56	56	56	56	57	58	58	58	58	59	59	59	60	61	64	70	74	74	71	68	64	62
Fri	61	60	60	60	59	59	58	57	57	58	58	59	60	61	63	65	71	82	88	88	84	79	72	69
Sat	69	70	70	70	70	70	69	69	69	69	68	68	69	69	71	73	80	92	99	98	93	86	76	68
Sun	66	66	65	65	65	65	65	65	65	65	65	66	66	67	69	73	79	88	92	89	83	78	75	73
Mon	72	71	72	72	73	73	74	74	74	74	74	74	74	74	75	78	85	99	108	109	108	104	98	91
Tue	85	81	79	78	75	75	75	75	75	76	76	76	77	77	78	83	95	110	117	118	115	110	106	100

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	57	56	55	54	53	53	52	52	51	51	51	51	51	52	53	55	61	69	76	78	76	72	67	61
Thu	58	57	56	56	56	56	57	58	58	58	58	59	59	59	60	61	64	70	74	74	71	68	64	62
Fri	61	60	60	60	59	59	58	57	57	58	58	59	60	61	63	65	71	82	88	88	84	79	72	69
Sat	69	70	70	70	70	70	69	69	69	69	68	68	69	69	71	73	80	92	99	98	93	86	76	68
Sun	66	66	65	65	65	65	65	65	65	65	65	66	66	67	69	73	79	88	92	89	83	78	75	73
Mon	72	71	72	72	73	73	74	74	74	74	74	74	74	74	75	78	85	99	108	109	108	104	98	91
Tue	85	81	79	78	75	75	75	75	75	76	76	76	77	77	78	83	95	110	117	118	115	110	106	100