26 Feb – 4 Mar 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

79.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 20.8 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+2.2 AQI compared with the previous week’s mean of 77.1.

Highest hourly estimate: 238 in Bangkok · 27 Feb, 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, 26 Feb	70.1Moderate	32–216	16.2	192 / 192
Thu, 27 Feb	80.6Moderate	40–238	19.3	192 / 192
Fri, 28 Feb	90.2Moderate	39–220	21.4	192 / 192
Sat, 1 Mar	76.7Moderate	44–158	20.9	192 / 192
Sun, 2 Mar	75.7Moderate	51–160	19.9	192 / 192
Mon, 3 Mar	77.8Moderate	52–172	22.9	192 / 192
Tue, 4 Mar	84.4Moderate	43–162	25.1	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	57	57	58	58	59	59	60	60	60	60	61	61	61	65	66	71	79	88	93	94	93	91	88	83
Thu	76	73	72	71	69	66	66	66	66	67	67	67	67	69	72	78	90	101	109	110	107	105	102	99
Fri	93	88	88	88	88	88	88	87	87	87	87	87	87	89	93	95	99	105	105	100	92	87	81	75
Sat	73	73	73	73	72	72	72	72	72	73	73	73	74	74	75	78	87	93	93	89	82	77	74	73
Sun	73	72	72	71	71	70	70	69	69	68	68	68	68	68	70	76	87	98	101	96	88	80	73	71
Mon	71	71	71	72	72	72	73	73	73	74	74	74	74	74	74	79	90	98	99	93	85	79	76	77
Tue	77	77	77	77	77	77	77	77	78	78	78	79	79	81	84	90	99	106	108	102	93	87	85	84

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	105.7Unhealthy for Sensitive Groups	238	26.4	168 / 168
Khon Kaen	88.4Moderate	172	26.4	168 / 168
Pattaya	87.9Moderate	221	15.8	168 / 168
Chiang Mai	86.6Moderate	138	27.8	168 / 168
Chiang Rai	82.7Moderate	147	26.9	168 / 168
Nakhon Ratchasima	82.3Moderate	156	24	168 / 168
Hat Yai	52.5Moderate	60	10.8	168 / 168
Phuket	48.7Good	93	8.6	168 / 168

City-hours by category

Good: 136

Moderate: 1000

Unhealthy for Sensitive Groups: 138

Unhealthy: 42

Very Unhealthy: 28

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	57	57	58	58	59	59	60	60	60	60	61	61	61	65	66	71	79	88	93	94	93	91	88	83
Thu	76	73	72	71	69	66	66	66	66	67	67	67	67	69	72	78	90	101	109	110	107	105	102	99
Fri	93	88	88	88	88	88	88	87	87	87	87	87	87	89	93	95	99	105	105	100	92	87	81	75
Sat	73	73	73	73	72	72	72	72	72	73	73	73	74	74	75	78	87	93	93	89	82	77	74	73
Sun	73	72	72	71	71	70	70	69	69	68	68	68	68	68	70	76	87	98	101	96	88	80	73	71
Mon	71	71	71	72	72	72	73	73	73	74	74	74	74	74	74	79	90	98	99	93	85	79	76	77
Tue	77	77	77	77	77	77	77	77	78	78	78	79	79	81	84	90	99	106	108	102	93	87	85	84

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	57	57	58	58	59	59	60	60	60	60	61	61	61	65	66	71	79	88	93	94	93	91	88	83
Thu	76	73	72	71	69	66	66	66	66	67	67	67	67	69	72	78	90	101	109	110	107	105	102	99
Fri	93	88	88	88	88	88	88	87	87	87	87	87	87	89	93	95	99	105	105	100	92	87	81	75
Sat	73	73	73	73	72	72	72	72	72	73	73	73	74	74	75	78	87	93	93	89	82	77	74	73
Sun	73	72	72	71	71	70	70	69	69	68	68	68	68	68	70	76	87	98	101	96	88	80	73	71
Mon	71	71	71	72	72	72	73	73	73	74	74	74	74	74	74	79	90	98	99	93	85	79	76	77
Tue	77	77	77	77	77	77	77	77	78	78	78	79	79	81	84	90	99	106	108	102	93	87	85	84

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	57	57	58	58	59	59	60	60	60	60	61	61	61	65	66	71	79	88	93	94	93	91	88	83
Thu	76	73	72	71	69	66	66	66	66	67	67	67	67	69	72	78	90	101	109	110	107	105	102	99
Fri	93	88	88	88	88	88	88	87	87	87	87	87	87	89	93	95	99	105	105	100	92	87	81	75
Sat	73	73	73	73	72	72	72	72	72	73	73	73	74	74	75	78	87	93	93	89	82	77	74	73
Sun	73	72	72	71	71	70	70	69	69	68	68	68	68	68	70	76	87	98	101	96	88	80	73	71
Mon	71	71	71	72	72	72	73	73	73	74	74	74	74	74	74	79	90	98	99	93	85	79	76	77
Tue	77	77	77	77	77	77	77	77	78	78	78	79	79	81	84	90	99	106	108	102	93	87	85	84