15 – 21 Jan 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

81.5Weekly mean modelled AQI · Moderate

Mean PM2.5: 21.8 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+1.8 AQI compared with the previous week’s mean of 79.7.

Highest hourly estimate: 197 in Bangkok · 20 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, 15 Jan	76.9Moderate	51–127	17.2	192 / 192
Thu, 16 Jan	64.3Moderate	42–126	12.7	192 / 192
Fri, 17 Jan	68.6Moderate	39–157	19.1	192 / 192
Sat, 18 Jan	83.5Moderate	39–171	23.2	192 / 192
Sun, 19 Jan	87.4Moderate	58–180	23.9	192 / 192
Mon, 20 Jan	92.3Moderate	57–197	25.7	192 / 192
Tue, 21 Jan	97.4Moderate	57–193	31.2	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	74	71	71	71	71	71	72	73	73	74	74	75	76	77	78	79	81	87	92	91	86	82	77	73
Thu	70	69	68	67	66	64	62	61	59	58	57	56	56	56	56	56	62	71	77	78	75	72	68	62
Fri	59	57	56	57	58	59	60	60	61	62	62	63	64	65	66	71	78	87	91	90	88	83	78	74
Sat	72	71	72	72	72	72	72	72	72	73	73	74	74	76	78	82	94	109	117	117	112	103	93	85
Sun	80	77	77	78	77	77	78	77	78	78	78	78	78	79	81	87	98	112	119	118	112	103	92	84
Mon	79	79	79	80	80	80	81	81	81	81	80	80	80	80	81	86	99	117	128	131	127	119	109	100
Tue	95	93	92	90	89	87	86	87	87	88	89	89	90	90	91	92	100	113	123	124	120	114	107	103

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	113.6Unhealthy for Sensitive Groups	197	38.2	168 / 168
Chiang Mai	95.4Moderate	180	27.6	168 / 168
Pattaya	91Moderate	173	21.3	168 / 168
Chiang Rai	78.7Moderate	147	21.5	168 / 168
Khon Kaen	75.6Moderate	107	22.6	168 / 168
Phuket	70.1Moderate	130	12.8	168 / 168
Nakhon Ratchasima	67.3Moderate	98	16.6	168 / 168
Hat Yai	60.4Moderate	79	14	168 / 168

City-hours by category

Good: 91

Moderate: 1014

Unhealthy for Sensitive Groups: 176

Unhealthy: 63

Very Unhealthy: 0

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	74	71	71	71	71	71	72	73	73	74	74	75	76	77	78	79	81	87	92	91	86	82	77	73
Thu	70	69	68	67	66	64	62	61	59	58	57	56	56	56	56	56	62	71	77	78	75	72	68	62
Fri	59	57	56	57	58	59	60	60	61	62	62	63	64	65	66	71	78	87	91	90	88	83	78	74
Sat	72	71	72	72	72	72	72	72	72	73	73	74	74	76	78	82	94	109	117	117	112	103	93	85
Sun	80	77	77	78	77	77	78	77	78	78	78	78	78	79	81	87	98	112	119	118	112	103	92	84
Mon	79	79	79	80	80	80	81	81	81	81	80	80	80	80	81	86	99	117	128	131	127	119	109	100
Tue	95	93	92	90	89	87	86	87	87	88	89	89	90	90	91	92	100	113	123	124	120	114	107	103

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	74	71	71	71	71	71	72	73	73	74	74	75	76	77	78	79	81	87	92	91	86	82	77	73
Thu	70	69	68	67	66	64	62	61	59	58	57	56	56	56	56	56	62	71	77	78	75	72	68	62
Fri	59	57	56	57	58	59	60	60	61	62	62	63	64	65	66	71	78	87	91	90	88	83	78	74
Sat	72	71	72	72	72	72	72	72	72	73	73	74	74	76	78	82	94	109	117	117	112	103	93	85
Sun	80	77	77	78	77	77	78	77	78	78	78	78	78	79	81	87	98	112	119	118	112	103	92	84
Mon	79	79	79	80	80	80	81	81	81	81	80	80	80	80	81	86	99	117	128	131	127	119	109	100
Tue	95	93	92	90	89	87	86	87	87	88	89	89	90	90	91	92	100	113	123	124	120	114	107	103

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	74	71	71	71	71	71	72	73	73	74	74	75	76	77	78	79	81	87	92	91	86	82	77	73
Thu	70	69	68	67	66	64	62	61	59	58	57	56	56	56	56	56	62	71	77	78	75	72	68	62
Fri	59	57	56	57	58	59	60	60	61	62	62	63	64	65	66	71	78	87	91	90	88	83	78	74
Sat	72	71	72	72	72	72	72	72	72	73	73	74	74	76	78	82	94	109	117	117	112	103	93	85
Sun	80	77	77	78	77	77	78	77	78	78	78	78	78	79	81	87	98	112	119	118	112	103	92	84
Mon	79	79	79	80	80	80	81	81	81	81	80	80	80	80	81	86	99	117	128	131	127	119	109	100
Tue	95	93	92	90	89	87	86	87	87	88	89	89	90	90	91	92	100	113	123	124	120	114	107	103