25 Feb – 3 Mar 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

72.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 19.9 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-7 AQI compared with the previous week’s mean of 79.9.

Highest hourly estimate: 188 in Bangkok · 26 Feb, 18:00 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, 25 Feb	79.9Moderate	53–123	21.5	192 / 192
Thu, 26 Feb	77.4Moderate	56–188	22.9	192 / 192
Fri, 27 Feb	77.3Moderate	33–178	19.3	192 / 192
Sat, 28 Feb	64.5Moderate	33–110	15.5	192 / 192
Sun, 1 Mar	61.6Moderate	24–125	15.2	192 / 192
Mon, 2 Mar	67.7Moderate	26–148	19.2	192 / 192
Tue, 3 Mar	81.8Moderate	30–186	25.4	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	80	80	80	79	79	79	78	77	77	77	76	76	75	75	75	77	82	90	93	92	86	81	77	75
Thu	74	73	73	73	72	72	72	72	72	72	73	73	73	74	74	78	85	90	93	93	89	85	80	76
Fri	76	77	77	78	78	78	79	80	79	79	78	78	77	75	74	76	80	83	83	81	78	75	70	69
Sat	68	68	67	67	66	66	65	64	64	64	63	63	63	62	62	62	63	70	71	67	62	62	62	62
Sun	61	61	60	60	59	59	58	58	58	58	58	58	58	58	58	61	67	74	75	72	67	63	60	60
Mon	60	60	59	59	59	59	59	60	60	61	62	63	63	64	65	68	77	90	94	89	82	73	70	69
Tue	68	68	68	69	69	69	70	70	70	71	71	72	73	73	74	83	97	111	116	113	107	101	94	88

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	89Moderate	188	23.5	168 / 168
Chiang Mai	86.2Moderate	164	27.8	168 / 168
Chiang Rai	83.7Moderate	130	26.9	168 / 168
Khon Kaen	81.4Moderate	119	23	168 / 168
Nakhon Ratchasima	80.1Moderate	109	24.1	168 / 168
Pattaya	58.8Moderate	156	12.3	168 / 168
Hat Yai	58.8Moderate	83	13	168 / 168
Phuket	45.2Good	123	8.2	168 / 168

City-hours by category

Good: 195

Moderate: 1023

Unhealthy for Sensitive Groups: 104

Unhealthy: 22

Very Unhealthy: 0

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	80	80	80	79	79	79	78	77	77	77	76	76	75	75	75	77	82	90	93	92	86	81	77	75
Thu	74	73	73	73	72	72	72	72	72	72	73	73	73	74	74	78	85	90	93	93	89	85	80	76
Fri	76	77	77	78	78	78	79	80	79	79	78	78	77	75	74	76	80	83	83	81	78	75	70	69
Sat	68	68	67	67	66	66	65	64	64	64	63	63	63	62	62	62	63	70	71	67	62	62	62	62
Sun	61	61	60	60	59	59	58	58	58	58	58	58	58	58	58	61	67	74	75	72	67	63	60	60
Mon	60	60	59	59	59	59	59	60	60	61	62	63	63	64	65	68	77	90	94	89	82	73	70	69
Tue	68	68	68	69	69	69	70	70	70	71	71	72	73	73	74	83	97	111	116	113	107	101	94	88

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	80	80	80	79	79	79	78	77	77	77	76	76	75	75	75	77	82	90	93	92	86	81	77	75
Thu	74	73	73	73	72	72	72	72	72	72	73	73	73	74	74	78	85	90	93	93	89	85	80	76
Fri	76	77	77	78	78	78	79	80	79	79	78	78	77	75	74	76	80	83	83	81	78	75	70	69
Sat	68	68	67	67	66	66	65	64	64	64	63	63	63	62	62	62	63	70	71	67	62	62	62	62
Sun	61	61	60	60	59	59	58	58	58	58	58	58	58	58	58	61	67	74	75	72	67	63	60	60
Mon	60	60	59	59	59	59	59	60	60	61	62	63	63	64	65	68	77	90	94	89	82	73	70	69
Tue	68	68	68	69	69	69	70	70	70	71	71	72	73	73	74	83	97	111	116	113	107	101	94	88

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	80	80	80	79	79	79	78	77	77	77	76	76	75	75	75	77	82	90	93	92	86	81	77	75
Thu	74	73	73	73	72	72	72	72	72	72	73	73	73	74	74	78	85	90	93	93	89	85	80	76
Fri	76	77	77	78	78	78	79	80	79	79	78	78	77	75	74	76	80	83	83	81	78	75	70	69
Sat	68	68	67	67	66	66	65	64	64	64	63	63	63	62	62	62	63	70	71	67	62	62	62	62
Sun	61	61	60	60	59	59	58	58	58	58	58	58	58	58	58	61	67	74	75	72	67	63	60	60
Mon	60	60	59	59	59	59	59	60	60	61	62	63	63	64	65	68	77	90	94	89	82	73	70	69
Tue	68	68	68	69	69	69	70	70	70	71	71	72	73	73	74	83	97	111	116	113	107	101	94	88