6 – 12 May 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

72.1Weekly mean modelled AQI · Moderate

Mean PM2.5: 18.9 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-4.7 AQI compared with the previous week’s mean of 76.8.

Highest hourly estimate: 261 in Bangkok · 9 May, 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, 6 May	84Moderate	36–185	24.2	192 / 192
Thu, 7 May	74.7Moderate	28–135	21.2	192 / 192
Fri, 8 May	71.8Moderate	32–128	19.9	192 / 192
Sat, 9 May	83.6Moderate	31–261	21	192 / 192
Sun, 10 May	70.2Moderate	28–212	14.1	192 / 192
Mon, 11 May	59.9Moderate	22–104	14.8	192 / 192
Tue, 12 May	60.8Moderate	23–118	17.4	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	78	74	74	75	76	77	78	80	81	82	83	83	83	83	82	87	93	100	101	98	93	90	85	81
Thu	79	78	77	77	76	75	74	73	73	73	72	72	72	72	72	72	75	79	79	78	76	74	73	72
Fri	72	71	71	71	70	70	69	69	68	67	67	67	68	68	68	70	76	83	86	84	78	72	70	70
Sat	70	70	70	70	70	71	70	70	70	71	71	71	74	78	84	93	101	108	111	111	109	104	99	94
Sun	89	83	75	70	68	67	66	65	64	63	62	61	61	60	64	69	73	78	80	79	76	74	71	67
Mon	61	56	56	56	57	58	58	58	59	59	59	60	60	61	61	61	62	64	66	65	63	60	59	59
Tue	58	58	58	57	57	57	57	58	58	59	59	60	60	60	61	62	63	66	67	66	65	65	64	64

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
Nakhon Ratchasima	100.5Unhealthy for Sensitive Groups	124	35.7	168 / 168
Bangkok	98.2Moderate	261	22.2	168 / 168
Khon Kaen	92.1Moderate	164	30.7	168 / 168
Chiang Mai	75.9Moderate	128	20.9	168 / 168
Chiang Rai	70.1Moderate	99	18.5	168 / 168
Pattaya	58.9Moderate	186	9.8	168 / 168
Hat Yai	46Good	66	8.7	168 / 168
Phuket	35.3Good	52	5.2	168 / 168

City-hours by category

Good: 309

Moderate: 858

Unhealthy for Sensitive Groups: 138

Unhealthy: 25

Very Unhealthy: 14

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	78	74	74	75	76	77	78	80	81	82	83	83	83	83	82	87	93	100	101	98	93	90	85	81
Thu	79	78	77	77	76	75	74	73	73	73	72	72	72	72	72	72	75	79	79	78	76	74	73	72
Fri	72	71	71	71	70	70	69	69	68	67	67	67	68	68	68	70	76	83	86	84	78	72	70	70
Sat	70	70	70	70	70	71	70	70	70	71	71	71	74	78	84	93	101	108	111	111	109	104	99	94
Sun	89	83	75	70	68	67	66	65	64	63	62	61	61	60	64	69	73	78	80	79	76	74	71	67
Mon	61	56	56	56	57	58	58	58	59	59	59	60	60	61	61	61	62	64	66	65	63	60	59	59
Tue	58	58	58	57	57	57	57	58	58	59	59	60	60	60	61	62	63	66	67	66	65	65	64	64

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	78	74	74	75	76	77	78	80	81	82	83	83	83	83	82	87	93	100	101	98	93	90	85	81
Thu	79	78	77	77	76	75	74	73	73	73	72	72	72	72	72	72	75	79	79	78	76	74	73	72
Fri	72	71	71	71	70	70	69	69	68	67	67	67	68	68	68	70	76	83	86	84	78	72	70	70
Sat	70	70	70	70	70	71	70	70	70	71	71	71	74	78	84	93	101	108	111	111	109	104	99	94
Sun	89	83	75	70	68	67	66	65	64	63	62	61	61	60	64	69	73	78	80	79	76	74	71	67
Mon	61	56	56	56	57	58	58	58	59	59	59	60	60	61	61	61	62	64	66	65	63	60	59	59
Tue	58	58	58	57	57	57	57	58	58	59	59	60	60	60	61	62	63	66	67	66	65	65	64	64

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	78	74	74	75	76	77	78	80	81	82	83	83	83	83	82	87	93	100	101	98	93	90	85	81
Thu	79	78	77	77	76	75	74	73	73	73	72	72	72	72	72	72	75	79	79	78	76	74	73	72
Fri	72	71	71	71	70	70	69	69	68	67	67	67	68	68	68	70	76	83	86	84	78	72	70	70
Sat	70	70	70	70	70	71	70	70	70	71	71	71	74	78	84	93	101	108	111	111	109	104	99	94
Sun	89	83	75	70	68	67	66	65	64	63	62	61	61	60	64	69	73	78	80	79	76	74	71	67
Mon	61	56	56	56	57	58	58	58	59	59	59	60	60	61	61	61	62	64	66	65	63	60	59	59
Tue	58	58	58	57	57	57	57	58	58	59	59	60	60	60	61	62	63	66	67	66	65	65	64	64