11 – 17 Mar 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

84.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 23 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-6.4 AQI compared with the previous week’s mean of 91.3.

Highest hourly estimate: 225 in Bangkok · 12 Mar, 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, 11 Mar	79.4Moderate	42–210	21.5	192 / 192
Thu, 12 Mar	94.7Moderate	39–225	25.6	192 / 192
Fri, 13 Mar	85.7Moderate	43–174	23.1	192 / 192
Sat, 14 Mar	82.2Moderate	50–198	19.7	192 / 192
Sun, 15 Mar	83.2Moderate	49–188	24.2	192 / 192
Mon, 16 Mar	84.2Moderate	45–214	22	192 / 192
Tue, 17 Mar	84.7Moderate	45–158	24.8	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	72	70	68	68	68	68	68	68	68	68	68	68	68	69	73	79	90	99	105	106	105	102	98	94
Thu	91	88	88	88	88	87	86	83	81	80	80	80	81	85	92	97	108	117	121	121	117	112	105	100
Fri	94	87	84	83	81	80	79	78	78	77	77	77	77	77	80	82	90	99	104	104	101	96	89	83
Sat	79	77	77	76	76	76	76	75	75	75	75	74	74	74	73	80	93	103	107	105	99	92	85	78
Sun	70	71	71	72	73	73	74	75	76	76	77	77	78	78	78	85	97	106	110	108	102	96	90	85
Mon	83	82	80	79	78	78	78	77	77	77	76	76	76	78	81	86	92	99	101	100	96	93	91	88
Tue	85	81	79	78	78	79	79	80	80	81	82	82	83	83	84	87	92	97	100	97	94	89	84	83

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	125.8Unhealthy for Sensitive Groups	225	33.4	168 / 168
Chiang Rai	112.9Unhealthy for Sensitive Groups	151	41.3	168 / 168
Chiang Mai	109Unhealthy for Sensitive Groups	158	36.5	168 / 168
Pattaya	91.1Moderate	176	16.7	168 / 168
Khon Kaen	70.8Moderate	105	19.8	168 / 168
Nakhon Ratchasima	70.6Moderate	134	18.2	168 / 168
Phuket	49.5Good	62	9	168 / 168
Hat Yai	49.2Good	52	9	168 / 168

City-hours by category

Good: 196

Moderate: 769

Unhealthy for Sensitive Groups: 305

Unhealthy: 56

Very Unhealthy: 18

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	72	70	68	68	68	68	68	68	68	68	68	68	68	69	73	79	90	99	105	106	105	102	98	94
Thu	91	88	88	88	88	87	86	83	81	80	80	80	81	85	92	97	108	117	121	121	117	112	105	100
Fri	94	87	84	83	81	80	79	78	78	77	77	77	77	77	80	82	90	99	104	104	101	96	89	83
Sat	79	77	77	76	76	76	76	75	75	75	75	74	74	74	73	80	93	103	107	105	99	92	85	78
Sun	70	71	71	72	73	73	74	75	76	76	77	77	78	78	78	85	97	106	110	108	102	96	90	85
Mon	83	82	80	79	78	78	78	77	77	77	76	76	76	78	81	86	92	99	101	100	96	93	91	88
Tue	85	81	79	78	78	79	79	80	80	81	82	82	83	83	84	87	92	97	100	97	94	89	84	83

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	72	70	68	68	68	68	68	68	68	68	68	68	68	69	73	79	90	99	105	106	105	102	98	94
Thu	91	88	88	88	88	87	86	83	81	80	80	80	81	85	92	97	108	117	121	121	117	112	105	100
Fri	94	87	84	83	81	80	79	78	78	77	77	77	77	77	80	82	90	99	104	104	101	96	89	83
Sat	79	77	77	76	76	76	76	75	75	75	75	74	74	74	73	80	93	103	107	105	99	92	85	78
Sun	70	71	71	72	73	73	74	75	76	76	77	77	78	78	78	85	97	106	110	108	102	96	90	85
Mon	83	82	80	79	78	78	78	77	77	77	76	76	76	78	81	86	92	99	101	100	96	93	91	88
Tue	85	81	79	78	78	79	79	80	80	81	82	82	83	83	84	87	92	97	100	97	94	89	84	83

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	72	70	68	68	68	68	68	68	68	68	68	68	68	69	73	79	90	99	105	106	105	102	98	94
Thu	91	88	88	88	88	87	86	83	81	80	80	80	81	85	92	97	108	117	121	121	117	112	105	100
Fri	94	87	84	83	81	80	79	78	78	77	77	77	77	77	80	82	90	99	104	104	101	96	89	83
Sat	79	77	77	76	76	76	76	75	75	75	75	74	74	74	73	80	93	103	107	105	99	92	85	78
Sun	70	71	71	72	73	73	74	75	76	76	77	77	78	78	78	85	97	106	110	108	102	96	90	85
Mon	83	82	80	79	78	78	78	77	77	77	76	76	76	78	81	86	92	99	101	100	96	93	91	88
Tue	85	81	79	78	78	79	79	80	80	81	82	82	83	83	84	87	92	97	100	97	94	89	84	83