5 – 11 Mar 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

82.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 23.4 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 79.3.

Highest hourly estimate: 225 in Bangkok · 9 Mar, 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, 5 Mar	81.9Moderate	41–144	23.2	192 / 192
Thu, 6 Mar	83.5Moderate	42–164	25.1	192 / 192
Fri, 7 Mar	79Moderate	45–153	24.1	192 / 192
Sat, 8 Mar	82.1Moderate	42–170	22.5	192 / 192
Sun, 9 Mar	83.1Moderate	34–225	22.4	192 / 192
Mon, 10 Mar	84.7Moderate	30–191	24.4	192 / 192
Tue, 11 Mar	81.9Moderate	25–205	22.5	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	82	81	81	80	79	79	79	79	78	79	78	78	78	79	80	82	89	96	97	92	85	80	78	78
Thu	78	79	79	79	80	81	81	82	82	83	83	83	83	82	82	83	90	95	95	91	87	85	82	82
Fri	81	81	81	80	79	78	78	77	76	75	75	74	74	74	75	76	80	84	87	87	84	81	79	80
Sat	80	80	80	80	81	81	81	81	81	80	80	80	80	79	79	79	82	88	91	92	91	87	82	76
Sun	75	74	75	75	75	75	75	76	76	75	75	74	74	76	77	81	89	97	104	105	104	101	98	92
Mon	84	83	82	80	77	77	78	78	78	79	80	80	81	81	81	84	91	100	103	101	94	89	87	85
Tue	84	83	81	81	80	79	78	78	77	77	77	77	77	77	80	83	89	96	98	94	89	83	77	75

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	122.9Unhealthy for Sensitive Groups	152	43.5	168 / 168
Bangkok	105.4Unhealthy for Sensitive Groups	225	30.4	168 / 168
Chiang Mai	102.1Unhealthy for Sensitive Groups	153	34.6	168 / 168
Khon Kaen	81.7Moderate	164	22.1	168 / 168
Nakhon Ratchasima	76.3Moderate	101	21.9	168 / 168
Pattaya	71.8Moderate	159	14.4	168 / 168
Phuket	49.3Good	69	10.9	168 / 168
Hat Yai	48.9Good	63	9.6	168 / 168

City-hours by category

Good: 203

Moderate: 796

Unhealthy for Sensitive Groups: 298

Unhealthy: 38

Very Unhealthy: 9

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	82	81	81	80	79	79	79	79	78	79	78	78	78	79	80	82	89	96	97	92	85	80	78	78
Thu	78	79	79	79	80	81	81	82	82	83	83	83	83	82	82	83	90	95	95	91	87	85	82	82
Fri	81	81	81	80	79	78	78	77	76	75	75	74	74	74	75	76	80	84	87	87	84	81	79	80
Sat	80	80	80	80	81	81	81	81	81	80	80	80	80	79	79	79	82	88	91	92	91	87	82	76
Sun	75	74	75	75	75	75	75	76	76	75	75	74	74	76	77	81	89	97	104	105	104	101	98	92
Mon	84	83	82	80	77	77	78	78	78	79	80	80	81	81	81	84	91	100	103	101	94	89	87	85
Tue	84	83	81	81	80	79	78	78	77	77	77	77	77	77	80	83	89	96	98	94	89	83	77	75

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	82	81	81	80	79	79	79	79	78	79	78	78	78	79	80	82	89	96	97	92	85	80	78	78
Thu	78	79	79	79	80	81	81	82	82	83	83	83	83	82	82	83	90	95	95	91	87	85	82	82
Fri	81	81	81	80	79	78	78	77	76	75	75	74	74	74	75	76	80	84	87	87	84	81	79	80
Sat	80	80	80	80	81	81	81	81	81	80	80	80	80	79	79	79	82	88	91	92	91	87	82	76
Sun	75	74	75	75	75	75	75	76	76	75	75	74	74	76	77	81	89	97	104	105	104	101	98	92
Mon	84	83	82	80	77	77	78	78	78	79	80	80	81	81	81	84	91	100	103	101	94	89	87	85
Tue	84	83	81	81	80	79	78	78	77	77	77	77	77	77	80	83	89	96	98	94	89	83	77	75

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	82	81	81	80	79	79	79	79	78	79	78	78	78	79	80	82	89	96	97	92	85	80	78	78
Thu	78	79	79	79	80	81	81	82	82	83	83	83	83	82	82	83	90	95	95	91	87	85	82	82
Fri	81	81	81	80	79	78	78	77	76	75	75	74	74	74	75	76	80	84	87	87	84	81	79	80
Sat	80	80	80	80	81	81	81	81	81	80	80	80	80	79	79	79	82	88	91	92	91	87	82	76
Sun	75	74	75	75	75	75	75	76	76	75	75	74	74	76	77	81	89	97	104	105	104	101	98	92
Mon	84	83	82	80	77	77	78	78	78	79	80	80	81	81	81	84	91	100	103	101	94	89	87	85
Tue	84	83	81	81	80	79	78	78	77	77	77	77	77	77	80	83	89	96	98	94	89	83	77	75