27 May – 2 Jun 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

56.5Weekly mean modelled AQI · Moderate

Mean PM2.5: 12.3 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+2.7 AQI compared with the previous week’s mean of 53.8.

Highest hourly estimate: 171 in Bangkok · 1 Jun, 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, 27 May	51.9Moderate	27–67	13	192 / 192
Thu, 28 May	54Moderate	23–70	11.2	192 / 192
Fri, 29 May	57.4Moderate	28–130	13.9	192 / 192
Sat, 30 May	58.7Moderate	38–142	13.2	192 / 192
Sun, 31 May	56.9Moderate	30–123	10.9	192 / 192
Mon, 1 Jun	58.5Moderate	28–171	12.7	192 / 192
Tue, 2 Jun	58Moderate	27–132	11.3	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	51	50	50	49	49	49	49	49	49	50	50	51	51	52	52	53	53	54	55	56	56	56	56	57
Thu	57	57	56	56	55	55	54	54	54	54	54	54	54	53	53	53	53	54	55	53	53	52	52	52
Fri	52	53	53	53	54	54	55	55	55	56	56	56	57	57	57	58	62	64	66	65	63	62	59	59
Sat	59	59	58	58	57	57	56	56	55	55	55	55	56	56	56	59	62	66	68	67	65	61	58	56
Sun	55	55	55	55	55	55	55	55	55	55	54	54	53	53	53	55	61	68	71	69	64	57	51	51
Mon	51	51	50	51	51	51	51	51	51	52	52	52	52	53	54	58	69	80	84	82	75	68	62	57
Tue	55	55	55	55	55	55	55	55	54	53	53	53	52	52	54	60	69	76	78	74	66	58	53	50

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
Khon Kaen	75.3Moderate	142	18.7	168 / 168
Nakhon Ratchasima	67.3Moderate	110	16.8	168 / 168
Bangkok	66.8Moderate	171	14.3	168 / 168
Chiang Rai	61.1Moderate	111	14.3	168 / 168
Chiang Mai	56.4Moderate	74	12	168 / 168
Hat Yai	45.3Good	54	8.4	168 / 168
Phuket	44.8Good	55	8.3	168 / 168
Pattaya	35.1Good	63	5.7	168 / 168

City-hours by category

Good: 437

Moderate: 867

Unhealthy for Sensitive Groups: 36

Unhealthy: 4

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	51	50	50	49	49	49	49	49	49	50	50	51	51	52	52	53	53	54	55	56	56	56	56	57
Thu	57	57	56	56	55	55	54	54	54	54	54	54	54	53	53	53	53	54	55	53	53	52	52	52
Fri	52	53	53	53	54	54	55	55	55	56	56	56	57	57	57	58	62	64	66	65	63	62	59	59
Sat	59	59	58	58	57	57	56	56	55	55	55	55	56	56	56	59	62	66	68	67	65	61	58	56
Sun	55	55	55	55	55	55	55	55	55	55	54	54	53	53	53	55	61	68	71	69	64	57	51	51
Mon	51	51	50	51	51	51	51	51	51	52	52	52	52	53	54	58	69	80	84	82	75	68	62	57
Tue	55	55	55	55	55	55	55	55	54	53	53	53	52	52	54	60	69	76	78	74	66	58	53	50

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	51	50	50	49	49	49	49	49	49	50	50	51	51	52	52	53	53	54	55	56	56	56	56	57
Thu	57	57	56	56	55	55	54	54	54	54	54	54	54	53	53	53	53	54	55	53	53	52	52	52
Fri	52	53	53	53	54	54	55	55	55	56	56	56	57	57	57	58	62	64	66	65	63	62	59	59
Sat	59	59	58	58	57	57	56	56	55	55	55	55	56	56	56	59	62	66	68	67	65	61	58	56
Sun	55	55	55	55	55	55	55	55	55	55	54	54	53	53	53	55	61	68	71	69	64	57	51	51
Mon	51	51	50	51	51	51	51	51	51	52	52	52	52	53	54	58	69	80	84	82	75	68	62	57
Tue	55	55	55	55	55	55	55	55	54	53	53	53	52	52	54	60	69	76	78	74	66	58	53	50

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	51	50	50	49	49	49	49	49	49	50	50	51	51	52	52	53	53	54	55	56	56	56	56	57
Thu	57	57	56	56	55	55	54	54	54	54	54	54	54	53	53	53	53	54	55	53	53	52	52	52
Fri	52	53	53	53	54	54	55	55	55	56	56	56	57	57	57	58	62	64	66	65	63	62	59	59
Sat	59	59	58	58	57	57	56	56	55	55	55	55	56	56	56	59	62	66	68	67	65	61	58	56
Sun	55	55	55	55	55	55	55	55	55	55	54	54	53	53	53	55	61	68	71	69	64	57	51	51
Mon	51	51	50	51	51	51	51	51	51	52	52	52	52	53	54	58	69	80	84	82	75	68	62	57
Tue	55	55	55	55	55	55	55	55	54	53	53	53	52	52	54	60	69	76	78	74	66	58	53	50