12 – 18 Feb 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

90.4Weekly mean modelled AQI · Moderate

Mean PM2.5: 25.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+9 AQI compared with the previous week’s mean of 81.4.

Highest hourly estimate: 270 in Bangkok · 12 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, 12 Feb	106.7Unhealthy for Sensitive Groups	56–270	30	192 / 192
Thu, 13 Feb	101.1Unhealthy for Sensitive Groups	49–245	25.4	192 / 192
Fri, 14 Feb	81.9Moderate	45–199	21.8	192 / 192
Sat, 15 Feb	86.3Moderate	53–207	27	192 / 192
Sun, 16 Feb	96Moderate	47–242	26.5	192 / 192
Mon, 17 Feb	81.4Moderate	44–154	23.8	192 / 192
Tue, 18 Feb	79.3Moderate	47–149	23.4	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	105	99	98	97	96	96	95	94	93	93	93	94	95	98	102	106	118	130	136	136	131	125	119	115
Thu	111	106	104	103	100	99	98	95	93	91	89	88	88	89	91	97	107	117	122	120	114	109	103	96
Fri	88	84	80	80	79	79	79	79	78	78	78	78	78	77	77	79	86	94	98	96	88	83	77	75
Sat	75	75	75	75	75	75	76	76	77	78	78	79	79	79	80	84	97	113	119	117	110	103	94	85
Sun	85	85	85	85	85	85	85	85	85	85	85	85	85	88	91	98	114	128	132	128	119	110	99	95
Mon	90	83	82	82	82	81	81	81	81	80	80	80	80	80	79	79	81	84	86	84	81	79	79	78
Tue	78	79	79	79	79	79	79	80	79	79	79	79	78	78	78	78	80	83	84	82	80	79	79	79

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	137.5Unhealthy for Sensitive Groups	270	40.9	168 / 168
Pattaya	111.4Unhealthy for Sensitive Groups	247	24.1	168 / 168
Chiang Rai	97.9Moderate	138	33.8	168 / 168
Chiang Mai	96.1Moderate	149	31.7	168 / 168
Nakhon Ratchasima	84.8Moderate	167	26.9	168 / 168
Khon Kaen	68.9Moderate	116	17.4	168 / 168
Phuket	65.8Moderate	109	13.8	168 / 168
Hat Yai	60.9Moderate	75	14.6	168 / 168

City-hours by category

Good: 27

Moderate: 918

Unhealthy for Sensitive Groups: 282

Unhealthy: 66

Very Unhealthy: 51

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	105	99	98	97	96	96	95	94	93	93	93	94	95	98	102	106	118	130	136	136	131	125	119	115
Thu	111	106	104	103	100	99	98	95	93	91	89	88	88	89	91	97	107	117	122	120	114	109	103	96
Fri	88	84	80	80	79	79	79	79	78	78	78	78	78	77	77	79	86	94	98	96	88	83	77	75
Sat	75	75	75	75	75	75	76	76	77	78	78	79	79	79	80	84	97	113	119	117	110	103	94	85
Sun	85	85	85	85	85	85	85	85	85	85	85	85	85	88	91	98	114	128	132	128	119	110	99	95
Mon	90	83	82	82	82	81	81	81	81	80	80	80	80	80	79	79	81	84	86	84	81	79	79	78
Tue	78	79	79	79	79	79	79	80	79	79	79	79	78	78	78	78	80	83	84	82	80	79	79	79

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	105	99	98	97	96	96	95	94	93	93	93	94	95	98	102	106	118	130	136	136	131	125	119	115
Thu	111	106	104	103	100	99	98	95	93	91	89	88	88	89	91	97	107	117	122	120	114	109	103	96
Fri	88	84	80	80	79	79	79	79	78	78	78	78	78	77	77	79	86	94	98	96	88	83	77	75
Sat	75	75	75	75	75	75	76	76	77	78	78	79	79	79	80	84	97	113	119	117	110	103	94	85
Sun	85	85	85	85	85	85	85	85	85	85	85	85	85	88	91	98	114	128	132	128	119	110	99	95
Mon	90	83	82	82	82	81	81	81	81	80	80	80	80	80	79	79	81	84	86	84	81	79	79	78
Tue	78	79	79	79	79	79	79	80	79	79	79	79	78	78	78	78	80	83	84	82	80	79	79	79

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	105	99	98	97	96	96	95	94	93	93	93	94	95	98	102	106	118	130	136	136	131	125	119	115
Thu	111	106	104	103	100	99	98	95	93	91	89	88	88	89	91	97	107	117	122	120	114	109	103	96
Fri	88	84	80	80	79	79	79	79	78	78	78	78	78	77	77	79	86	94	98	96	88	83	77	75
Sat	75	75	75	75	75	75	76	76	77	78	78	79	79	79	80	84	97	113	119	117	110	103	94	85
Sun	85	85	85	85	85	85	85	85	85	85	85	85	85	88	91	98	114	128	132	128	119	110	99	95
Mon	90	83	82	82	82	81	81	81	81	80	80	80	80	80	79	79	81	84	86	84	81	79	79	78
Tue	78	79	79	79	79	79	79	80	79	79	79	79	78	78	78	78	80	83	84	82	80	79	79	79