7 – 13 May 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

62.6Weekly mean modelled AQI · Moderate

Mean PM2.5: 16.6 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-10.9 AQI compared with the previous week’s mean of 73.5.

Highest hourly estimate: 151 in Bangkok · 9 May, 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, 7 May	54Moderate	23–96	12.1	192 / 192
Thu, 8 May	57.7Moderate	21–110	16.4	192 / 192
Fri, 9 May	64.3Moderate	22–151	16.1	192 / 192
Sat, 10 May	66.2Moderate	29–131	22.3	192 / 192
Sun, 11 May	72.9Moderate	28–112	19.5	192 / 192
Mon, 12 May	65Moderate	27–120	14.2	192 / 192
Tue, 13 May	58.1Moderate	27–88	15.4	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	58	57	55	55	54	53	52	51	51	51	51	51	51	51	52	52	57	61	62	59	55	53	52	51
Thu	51	52	52	52	53	54	54	54	55	56	56	57	57	58	58	59	62	67	68	66	64	61	60	60
Fri	60	61	61	61	61	61	61	61	60	60	60	60	60	60	60	65	73	80	82	79	72	66	61	60
Sat	60	60	60	60	60	60	60	61	62	62	63	63	64	65	66	66	70	77	80	79	75	74	72	72
Sun	73	73	74	74	74	75	75	75	74	74	73	73	73	72	72	73	73	73	75	75	72	70	68	67
Mon	67	66	66	65	65	64	63	62	62	62	61	61	60	59	60	64	69	74	79	78	73	66	59	57
Tue	57	57	57	57	57	57	57	57	57	57	57	58	58	58	58	58	59	62	63	62	59	58	58	59

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	82.2Moderate	102	24.6	168 / 168
Khon Kaen	81Moderate	131	23	168 / 168
Bangkok	77.6Moderate	151	21.5	168 / 168
Chiang Mai	75.7Moderate	120	21.3	168 / 168
Nakhon Ratchasima	73.2Moderate	94	21.3	168 / 168
Pattaya	47.5Good	71	9.7	168 / 168
Hat Yai	34.7Good	45	6.4	168 / 168
Phuket	28.9Good	36	4.7	168 / 168

City-hours by category

Good: 437

Moderate: 872

Unhealthy for Sensitive Groups: 34

Unhealthy: 1

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	58	57	55	55	54	53	52	51	51	51	51	51	51	51	52	52	57	61	62	59	55	53	52	51
Thu	51	52	52	52	53	54	54	54	55	56	56	57	57	58	58	59	62	67	68	66	64	61	60	60
Fri	60	61	61	61	61	61	61	61	60	60	60	60	60	60	60	65	73	80	82	79	72	66	61	60
Sat	60	60	60	60	60	60	60	61	62	62	63	63	64	65	66	66	70	77	80	79	75	74	72	72
Sun	73	73	74	74	74	75	75	75	74	74	73	73	73	72	72	73	73	73	75	75	72	70	68	67
Mon	67	66	66	65	65	64	63	62	62	62	61	61	60	59	60	64	69	74	79	78	73	66	59	57
Tue	57	57	57	57	57	57	57	57	57	57	57	58	58	58	58	58	59	62	63	62	59	58	58	59

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	58	57	55	55	54	53	52	51	51	51	51	51	51	51	52	52	57	61	62	59	55	53	52	51
Thu	51	52	52	52	53	54	54	54	55	56	56	57	57	58	58	59	62	67	68	66	64	61	60	60
Fri	60	61	61	61	61	61	61	61	60	60	60	60	60	60	60	65	73	80	82	79	72	66	61	60
Sat	60	60	60	60	60	60	60	61	62	62	63	63	64	65	66	66	70	77	80	79	75	74	72	72
Sun	73	73	74	74	74	75	75	75	74	74	73	73	73	72	72	73	73	73	75	75	72	70	68	67
Mon	67	66	66	65	65	64	63	62	62	62	61	61	60	59	60	64	69	74	79	78	73	66	59	57
Tue	57	57	57	57	57	57	57	57	57	57	57	58	58	58	58	58	59	62	63	62	59	58	58	59

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	58	57	55	55	54	53	52	51	51	51	51	51	51	51	52	52	57	61	62	59	55	53	52	51
Thu	51	52	52	52	53	54	54	54	55	56	56	57	57	58	58	59	62	67	68	66	64	61	60	60
Fri	60	61	61	61	61	61	61	61	60	60	60	60	60	60	60	65	73	80	82	79	72	66	61	60
Sat	60	60	60	60	60	60	60	61	62	62	63	63	64	65	66	66	70	77	80	79	75	74	72	72
Sun	73	73	74	74	74	75	75	75	74	74	73	73	73	72	72	73	73	73	75	75	72	70	68	67
Mon	67	66	66	65	65	64	63	62	62	62	61	61	60	59	60	64	69	74	79	78	73	66	59	57
Tue	57	57	57	57	57	57	57	57	57	57	57	58	58	58	58	58	59	62	63	62	59	58	58	59