2 – 8 Apr 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

92.4Weekly mean modelled AQI · Moderate

Mean PM2.5: 28.7 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-12.2 AQI compared with the previous week’s mean of 104.6.

Highest hourly estimate: 225 in Bangkok · 3 Apr, 20:00 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, 2 Apr	96.7Moderate	29–208	32.3	192 / 192
Thu, 3 Apr	97.9Moderate	25–225	33.3	192 / 192
Fri, 4 Apr	105.4Unhealthy for Sensitive Groups	25–197	32.8	192 / 192
Sat, 5 Apr	92.1Moderate	35–175	26.9	192 / 192
Sun, 6 Apr	84.4Moderate	39–169	24.5	192 / 192
Mon, 7 Apr	83.4Moderate	50–165	25.9	192 / 192
Tue, 8 Apr	86.7Moderate	53–162	25	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	103	99	95	93	93	94	94	95	94	95	95	94	95	95	95	95	95	102	106	105	103	100	96	93
Thu	93	92	92	91	91	90	89	88	87	87	87	87	88	88	92	96	104	112	116	117	117	117	115	113
Fri	111	107	104	100	98	99	100	101	102	102	103	102	103	102	102	105	111	117	120	118	112	107	103	100
Sat	98	97	96	94	93	92	92	91	90	90	90	90	90	90	90	93	95	98	97	95	90	87	86	86
Sun	86	86	85	85	85	85	85	85	84	83	82	81	81	80	80	80	84	89	91	92	89	85	83	81
Mon	80	80	80	80	80	80	80	79	79	79	80	80	81	82	82	84	87	95	97	95	90	85	84	84
Tue	83	83	83	83	83	83	83	83	83	83	82	82	81	81	80	84	93	102	106	104	100	92	83	80

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
Chiang Rai	137.1Unhealthy for Sensitive Groups	164	51	168 / 168
Khon Kaen	120.5Unhealthy for Sensitive Groups	175	42.3	168 / 168
Chiang Mai	114.6Unhealthy for Sensitive Groups	158	39.5	168 / 168
Nakhon Ratchasima	109.2Unhealthy for Sensitive Groups	162	38.7	168 / 168
Bangkok	102Unhealthy for Sensitive Groups	225	25.6	168 / 168
Pattaya	67.4Moderate	118	15.5	168 / 168
Hat Yai	44.4Good	59	8.7	168 / 168
Phuket	43.6Good	59	8.2	168 / 168

City-hours by category

Good: 203

Moderate: 543

Unhealthy for Sensitive Groups: 444

Unhealthy: 146

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	103	99	95	93	93	94	94	95	94	95	95	94	95	95	95	95	95	102	106	105	103	100	96	93
Thu	93	92	92	91	91	90	89	88	87	87	87	87	88	88	92	96	104	112	116	117	117	117	115	113
Fri	111	107	104	100	98	99	100	101	102	102	103	102	103	102	102	105	111	117	120	118	112	107	103	100
Sat	98	97	96	94	93	92	92	91	90	90	90	90	90	90	90	93	95	98	97	95	90	87	86	86
Sun	86	86	85	85	85	85	85	85	84	83	82	81	81	80	80	80	84	89	91	92	89	85	83	81
Mon	80	80	80	80	80	80	80	79	79	79	80	80	81	82	82	84	87	95	97	95	90	85	84	84
Tue	83	83	83	83	83	83	83	83	83	83	82	82	81	81	80	84	93	102	106	104	100	92	83	80

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	103	99	95	93	93	94	94	95	94	95	95	94	95	95	95	95	95	102	106	105	103	100	96	93
Thu	93	92	92	91	91	90	89	88	87	87	87	87	88	88	92	96	104	112	116	117	117	117	115	113
Fri	111	107	104	100	98	99	100	101	102	102	103	102	103	102	102	105	111	117	120	118	112	107	103	100
Sat	98	97	96	94	93	92	92	91	90	90	90	90	90	90	90	93	95	98	97	95	90	87	86	86
Sun	86	86	85	85	85	85	85	85	84	83	82	81	81	80	80	80	84	89	91	92	89	85	83	81
Mon	80	80	80	80	80	80	80	79	79	79	80	80	81	82	82	84	87	95	97	95	90	85	84	84
Tue	83	83	83	83	83	83	83	83	83	83	82	82	81	81	80	84	93	102	106	104	100	92	83	80

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	103	99	95	93	93	94	94	95	94	95	95	94	95	95	95	95	95	102	106	105	103	100	96	93
Thu	93	92	92	91	91	90	89	88	87	87	87	87	88	88	92	96	104	112	116	117	117	117	115	113
Fri	111	107	104	100	98	99	100	101	102	102	103	102	103	102	102	105	111	117	120	118	112	107	103	100
Sat	98	97	96	94	93	92	92	91	90	90	90	90	90	90	90	93	95	98	97	95	90	87	86	86
Sun	86	86	85	85	85	85	85	85	84	83	82	81	81	80	80	80	84	89	91	92	89	85	83	81
Mon	80	80	80	80	80	80	80	79	79	79	80	80	81	82	82	84	87	95	97	95	90	85	84	84
Tue	83	83	83	83	83	83	83	83	83	83	82	82	81	81	80	84	93	102	106	104	100	92	83	80