22 – 28 Jan 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

100.6Weekly mean modelled AQI · Unhealthy for Sensitive Groups

Mean PM2.5: 28.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+19.1 AQI compared with the previous week’s mean of 81.5.

Highest hourly estimate: 288 in Bangkok · 24 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, 22 Jan	104.9Unhealthy for Sensitive Groups	64–211	31.9	192 / 192
Thu, 23 Jan	118Unhealthy for Sensitive Groups	67–248	38.3	192 / 192
Fri, 24 Jan	124.1Unhealthy for Sensitive Groups	48–288	36.4	192 / 192
Sat, 25 Jan	115.7Unhealthy for Sensitive Groups	50–245	27.4	192 / 192
Sun, 26 Jan	97.3Moderate	50–215	23.1	192 / 192
Mon, 27 Jan	69.6Moderate	48–131	15.7	192 / 192
Tue, 28 Jan	75Moderate	47–153	24.3	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	99	97	97	98	98	98	99	98	97	96	95	94	94	94	94	97	108	125	133	134	130	123	113	108
Thu	106	107	107	107	107	107	108	107	107	106	106	106	107	109	110	119	130	143	150	150	145	137	128	123
Fri	120	117	116	115	114	113	112	111	110	109	109	108	108	111	113	119	137	153	160	161	156	147	136	125
Sat	116	111	107	106	106	104	103	102	101	101	100	101	101	102	110	121	137	149	154	150	142	130	118	103
Sun	92	89	85	84	83	83	82	81	81	81	81	81	82	84	90	106	119	130	133	132	127	120	111	100
Mon	89	82	78	76	74	73	72	71	70	68	67	67	66	65	64	63	63	62	65	70	71	69	66	62
Tue	62	63	64	65	65	66	67	68	69	70	71	72	73	74	75	76	78	85	89	92	93	91	87	82

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	154.4Unhealthy	288	54.3	168 / 168
Pattaya	148.2Unhealthy for Sensitive Groups	270	30.4	168 / 168
Chiang Mai	101Unhealthy for Sensitive Groups	190	31.9	168 / 168
Nakhon Ratchasima	97.6Moderate	208	27.1	168 / 168
Khon Kaen	93.2Moderate	186	27.5	168 / 168
Chiang Rai	87.4Moderate	160	25.4	168 / 168
Phuket	63.9Moderate	103	14.9	168 / 168
Hat Yai	59.5Moderate	79	13.7	168 / 168

City-hours by category

Good: 28

Moderate: 889

Unhealthy for Sensitive Groups: 192

Unhealthy: 144

Very Unhealthy: 91

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	99	97	97	98	98	98	99	98	97	96	95	94	94	94	94	97	108	125	133	134	130	123	113	108
Thu	106	107	107	107	107	107	108	107	107	106	106	106	107	109	110	119	130	143	150	150	145	137	128	123
Fri	120	117	116	115	114	113	112	111	110	109	109	108	108	111	113	119	137	153	160	161	156	147	136	125
Sat	116	111	107	106	106	104	103	102	101	101	100	101	101	102	110	121	137	149	154	150	142	130	118	103
Sun	92	89	85	84	83	83	82	81	81	81	81	81	82	84	90	106	119	130	133	132	127	120	111	100
Mon	89	82	78	76	74	73	72	71	70	68	67	67	66	65	64	63	63	62	65	70	71	69	66	62
Tue	62	63	64	65	65	66	67	68	69	70	71	72	73	74	75	76	78	85	89	92	93	91	87	82

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	99	97	97	98	98	98	99	98	97	96	95	94	94	94	94	97	108	125	133	134	130	123	113	108
Thu	106	107	107	107	107	107	108	107	107	106	106	106	107	109	110	119	130	143	150	150	145	137	128	123
Fri	120	117	116	115	114	113	112	111	110	109	109	108	108	111	113	119	137	153	160	161	156	147	136	125
Sat	116	111	107	106	106	104	103	102	101	101	100	101	101	102	110	121	137	149	154	150	142	130	118	103
Sun	92	89	85	84	83	83	82	81	81	81	81	81	82	84	90	106	119	130	133	132	127	120	111	100
Mon	89	82	78	76	74	73	72	71	70	68	67	67	66	65	64	63	63	62	65	70	71	69	66	62
Tue	62	63	64	65	65	66	67	68	69	70	71	72	73	74	75	76	78	85	89	92	93	91	87	82

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	99	97	97	98	98	98	99	98	97	96	95	94	94	94	94	97	108	125	133	134	130	123	113	108
Thu	106	107	107	107	107	107	108	107	107	106	106	106	107	109	110	119	130	143	150	150	145	137	128	123
Fri	120	117	116	115	114	113	112	111	110	109	109	108	108	111	113	119	137	153	160	161	156	147	136	125
Sat	116	111	107	106	106	104	103	102	101	101	100	101	101	102	110	121	137	149	154	150	142	130	118	103
Sun	92	89	85	84	83	83	82	81	81	81	81	81	82	84	90	106	119	130	133	132	127	120	111	100
Mon	89	82	78	76	74	73	72	71	70	68	67	67	66	65	64	63	63	62	65	70	71	69	66	62
Tue	62	63	64	65	65	66	67	68	69	70	71	72	73	74	75	76	78	85	89	92	93	91	87	82