4 – 10 Mar 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

91.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 25.7 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+18.4 AQI compared with the previous week’s mean of 72.9.

Highest hourly estimate: 228 in Bangkok · 7 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, 4 Mar	99.3Moderate	48–204	33.1	192 / 192
Thu, 5 Mar	100Moderate	61–188	34.5	192 / 192
Fri, 6 Mar	95.9Moderate	56–173	25.5	192 / 192
Sat, 7 Mar	88.4Moderate	38–228	21.8	192 / 192
Sun, 8 Mar	89Moderate	37–227	24.1	192 / 192
Mon, 9 Mar	87.6Moderate	53–203	22.4	192 / 192
Tue, 10 Mar	79Moderate	43–143	18.7	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	86	84	84	85	86	87	87	88	89	90	91	92	92	93	96	104	117	128	132	130	124	114	108	100
Thu	95	95	95	95	95	95	96	96	96	96	97	97	98	99	99	103	107	111	112	110	107	104	101	101
Fri	101	101	101	100	100	100	99	99	98	97	95	94	93	92	90	90	93	96	98	98	96	94	91	88
Sat	83	83	83	83	82	82	82	82	81	80	80	80	79	81	83	84	91	100	104	106	105	104	103	101
Sun	99	96	91	86	83	79	75	72	72	72	72	74	77	83	88	95	100	106	109	108	105	103	99	96
Mon	91	85	81	79	80	80	80	80	80	80	79	79	78	78	79	86	95	106	111	110	107	100	93	86
Tue	85	83	81	79	78	76	75	75	74	73	73	73	72	72	73	74	78	86	92	93	90	86	81	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 Mai	132.8Unhealthy for Sensitive Groups	188	48.5	168 / 168
Chiang Rai	126.2Unhealthy for Sensitive Groups	163	46.1	168 / 168
Bangkok	125.5Unhealthy for Sensitive Groups	228	30.9	168 / 168
Pattaya	83.8Moderate	162	16.5	168 / 168
Nakhon Ratchasima	76Moderate	132	19.8	168 / 168
Khon Kaen	69.6Moderate	103	17.3	168 / 168
Phuket	60.9Moderate	83	14.5	168 / 168
Hat Yai	55.9Moderate	72	12.3	168 / 168

City-hours by category

Good: 61

Moderate: 832

Unhealthy for Sensitive Groups: 333

Unhealthy: 99

Very Unhealthy: 19

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	86	84	84	85	86	87	87	88	89	90	91	92	92	93	96	104	117	128	132	130	124	114	108	100
Thu	95	95	95	95	95	95	96	96	96	96	97	97	98	99	99	103	107	111	112	110	107	104	101	101
Fri	101	101	101	100	100	100	99	99	98	97	95	94	93	92	90	90	93	96	98	98	96	94	91	88
Sat	83	83	83	83	82	82	82	82	81	80	80	80	79	81	83	84	91	100	104	106	105	104	103	101
Sun	99	96	91	86	83	79	75	72	72	72	72	74	77	83	88	95	100	106	109	108	105	103	99	96
Mon	91	85	81	79	80	80	80	80	80	80	79	79	78	78	79	86	95	106	111	110	107	100	93	86
Tue	85	83	81	79	78	76	75	75	74	73	73	73	72	72	73	74	78	86	92	93	90	86	81	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	86	84	84	85	86	87	87	88	89	90	91	92	92	93	96	104	117	128	132	130	124	114	108	100
Thu	95	95	95	95	95	95	96	96	96	96	97	97	98	99	99	103	107	111	112	110	107	104	101	101
Fri	101	101	101	100	100	100	99	99	98	97	95	94	93	92	90	90	93	96	98	98	96	94	91	88
Sat	83	83	83	83	82	82	82	82	81	80	80	80	79	81	83	84	91	100	104	106	105	104	103	101
Sun	99	96	91	86	83	79	75	72	72	72	72	74	77	83	88	95	100	106	109	108	105	103	99	96
Mon	91	85	81	79	80	80	80	80	80	80	79	79	78	78	79	86	95	106	111	110	107	100	93	86
Tue	85	83	81	79	78	76	75	75	74	73	73	73	72	72	73	74	78	86	92	93	90	86	81	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	86	84	84	85	86	87	87	88	89	90	91	92	92	93	96	104	117	128	132	130	124	114	108	100
Thu	95	95	95	95	95	95	96	96	96	96	97	97	98	99	99	103	107	111	112	110	107	104	101	101
Fri	101	101	101	100	100	100	99	99	98	97	95	94	93	92	90	90	93	96	98	98	96	94	91	88
Sat	83	83	83	83	82	82	82	82	81	80	80	80	79	81	83	84	91	100	104	106	105	104	103	101
Sun	99	96	91	86	83	79	75	72	72	72	72	74	77	83	88	95	100	106	109	108	105	103	99	96
Mon	91	85	81	79	80	80	80	80	80	80	79	79	78	78	79	86	95	106	111	110	107	100	93	86
Tue	85	83	81	79	78	76	75	75	74	73	73	73	72	72	73	74	78	86	92	93	90	86	81	75