29 Apr – 5 May 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

76.8Weekly mean modelled AQI · Moderate

Mean PM2.5: 21 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-12.1 AQI compared with the previous week’s mean of 88.9.

Highest hourly estimate: 213 in Bangkok · 5 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, 29 Apr	84.9Moderate	46–162	24	192 / 192
Thu, 30 Apr	81.9Moderate	45–153	25.3	192 / 192
Fri, 1 May	84.6Moderate	51–178	20.7	192 / 192
Sat, 2 May	72Moderate	48–145	19.2	192 / 192
Sun, 3 May	69.3Moderate	32–152	17.2	192 / 192
Mon, 4 May	68.5Moderate	26–141	19.6	192 / 192
Tue, 5 May	76.1Moderate	26–213	21.1	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	84	84	83	83	83	83	83	83	82	81	80	79	79	78	79	83	91	97	99	97	93	88	83	80
Thu	79	79	79	80	79	79	79	79	80	80	80	80	80	81	81	81	82	86	90	91	89	86	84	82
Fri	83	83	83	83	82	82	82	82	82	82	82	82	81	81	80	86	93	98	100	97	91	85	79	73
Sat	72	71	71	70	70	69	69	69	69	69	69	69	69	69	71	76	81	84	84	79	74	70	69	69
Sun	69	69	69	69	69	69	69	69	68	68	67	66	66	65	66	71	76	78	79	76	71	67	64	64
Mon	63	63	63	63	63	63	63	63	63	64	64	65	65	66	67	69	77	84	86	84	77	72	69	69
Tue	69	68	68	67	67	67	67	68	67	68	68	68	68	74	75	79	87	95	97	95	91	87	86	83

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	100.9Unhealthy for Sensitive Groups	140	34.2	168 / 168
Chiang Mai	97.6Moderate	153	31.3	168 / 168
Khon Kaen	96.6Moderate	162	28.3	168 / 168
Nakhon Ratchasima	86.6Moderate	132	27.5	168 / 168
Bangkok	84Moderate	213	18.4	168 / 168
Hat Yai	52.9Moderate	58	10.5	168 / 168
Pattaya	48.7Good	70	9.3	168 / 168
Phuket	46.8Good	70	8.7	168 / 168

City-hours by category

Good: 168

Moderate: 924

Unhealthy for Sensitive Groups: 226

Unhealthy: 22

Very Unhealthy: 4

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	84	84	83	83	83	83	83	83	82	81	80	79	79	78	79	83	91	97	99	97	93	88	83	80
Thu	79	79	79	80	79	79	79	79	80	80	80	80	80	81	81	81	82	86	90	91	89	86	84	82
Fri	83	83	83	83	82	82	82	82	82	82	82	82	81	81	80	86	93	98	100	97	91	85	79	73
Sat	72	71	71	70	70	69	69	69	69	69	69	69	69	69	71	76	81	84	84	79	74	70	69	69
Sun	69	69	69	69	69	69	69	69	68	68	67	66	66	65	66	71	76	78	79	76	71	67	64	64
Mon	63	63	63	63	63	63	63	63	63	64	64	65	65	66	67	69	77	84	86	84	77	72	69	69
Tue	69	68	68	67	67	67	67	68	67	68	68	68	68	74	75	79	87	95	97	95	91	87	86	83

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	84	84	83	83	83	83	83	83	82	81	80	79	79	78	79	83	91	97	99	97	93	88	83	80
Thu	79	79	79	80	79	79	79	79	80	80	80	80	80	81	81	81	82	86	90	91	89	86	84	82
Fri	83	83	83	83	82	82	82	82	82	82	82	82	81	81	80	86	93	98	100	97	91	85	79	73
Sat	72	71	71	70	70	69	69	69	69	69	69	69	69	69	71	76	81	84	84	79	74	70	69	69
Sun	69	69	69	69	69	69	69	69	68	68	67	66	66	65	66	71	76	78	79	76	71	67	64	64
Mon	63	63	63	63	63	63	63	63	63	64	64	65	65	66	67	69	77	84	86	84	77	72	69	69
Tue	69	68	68	67	67	67	67	68	67	68	68	68	68	74	75	79	87	95	97	95	91	87	86	83

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	84	84	83	83	83	83	83	83	82	81	80	79	79	78	79	83	91	97	99	97	93	88	83	80
Thu	79	79	79	80	79	79	79	79	80	80	80	80	80	81	81	81	82	86	90	91	89	86	84	82
Fri	83	83	83	83	82	82	82	82	82	82	82	82	81	81	80	86	93	98	100	97	91	85	79	73
Sat	72	71	71	70	70	69	69	69	69	69	69	69	69	69	71	76	81	84	84	79	74	70	69	69
Sun	69	69	69	69	69	69	69	69	68	68	67	66	66	65	66	71	76	78	79	76	71	67	64	64
Mon	63	63	63	63	63	63	63	63	63	64	64	65	65	66	67	69	77	84	86	84	77	72	69	69
Tue	69	68	68	67	67	67	67	68	67	68	68	68	68	74	75	79	87	95	97	95	91	87	86	83