22 – 28 Apr 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

88.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 27.3 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-11.7 AQI compared with the previous week’s mean of 100.6.

Highest hourly estimate: 192 in Bangkok · 26 Apr, 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, 22 Apr	93.9Moderate	53–155	29.7	192 / 192
Thu, 23 Apr	89.8Moderate	51–155	27.6	192 / 192
Fri, 24 Apr	89.5Moderate	50–157	28.5	192 / 192
Sat, 25 Apr	94.7Moderate	54–150	30.7	192 / 192
Sun, 26 Apr	90.9Moderate	50–192	23.7	192 / 192
Mon, 27 Apr	79.5Moderate	44–149	24.8	192 / 192
Tue, 28 Apr	84.4Moderate	43–143	25.9	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	92	92	92	92	92	91	91	91	91	91	91	91	91	91	92	94	98	102	103	103	101	98	95	93
Thu	92	92	92	91	91	91	91	90	90	90	89	89	89	89	88	89	90	92	92	90	87	87	87	87
Fri	86	86	86	86	86	87	87	88	88	88	89	89	89	89	89	89	91	94	97	96	94	93	92	90
Sat	90	90	91	91	92	92	93	93	93	93	93	94	94	94	94	94	97	100	103	104	101	99	95	94
Sun	94	94	94	94	93	93	91	90	89	87	85	84	84	83	82	86	90	99	103	103	97	92	89	85
Mon	80	77	77	76	76	76	76	76	77	78	78	79	79	80	80	80	83	85	86	84	82	81	81	81
Tue	81	81	82	82	82	82	82	82	83	84	85	85	86	86	86	86	87	88	88	87	86	85	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
Chiang Rai	136Unhealthy for Sensitive Groups	157	50.7	168 / 168
Chiang Mai	126.8Unhealthy for Sensitive Groups	154	45.9	168 / 168
Khon Kaen	113.5Unhealthy for Sensitive Groups	149	39.5	168 / 168
Nakhon Ratchasima	94.2Moderate	149	30.7	168 / 168
Bangkok	72.1Moderate	192	16.9	168 / 168
Phuket	59.1Moderate	120	11.8	168 / 168
Hat Yai	55.5Moderate	79	11.9	168 / 168
Pattaya	54.2Moderate	66	10.8	168 / 168

City-hours by category

Good: 68

Moderate: 762

Unhealthy for Sensitive Groups: 425

Unhealthy: 89

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	92	92	92	92	92	91	91	91	91	91	91	91	91	91	92	94	98	102	103	103	101	98	95	93
Thu	92	92	92	91	91	91	91	90	90	90	89	89	89	89	88	89	90	92	92	90	87	87	87	87
Fri	86	86	86	86	86	87	87	88	88	88	89	89	89	89	89	89	91	94	97	96	94	93	92	90
Sat	90	90	91	91	92	92	93	93	93	93	93	94	94	94	94	94	97	100	103	104	101	99	95	94
Sun	94	94	94	94	93	93	91	90	89	87	85	84	84	83	82	86	90	99	103	103	97	92	89	85
Mon	80	77	77	76	76	76	76	76	77	78	78	79	79	80	80	80	83	85	86	84	82	81	81	81
Tue	81	81	82	82	82	82	82	82	83	84	85	85	86	86	86	86	87	88	88	87	86	85	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	92	92	92	92	92	91	91	91	91	91	91	91	91	91	92	94	98	102	103	103	101	98	95	93
Thu	92	92	92	91	91	91	91	90	90	90	89	89	89	89	88	89	90	92	92	90	87	87	87	87
Fri	86	86	86	86	86	87	87	88	88	88	89	89	89	89	89	89	91	94	97	96	94	93	92	90
Sat	90	90	91	91	92	92	93	93	93	93	93	94	94	94	94	94	97	100	103	104	101	99	95	94
Sun	94	94	94	94	93	93	91	90	89	87	85	84	84	83	82	86	90	99	103	103	97	92	89	85
Mon	80	77	77	76	76	76	76	76	77	78	78	79	79	80	80	80	83	85	86	84	82	81	81	81
Tue	81	81	82	82	82	82	82	82	83	84	85	85	86	86	86	86	87	88	88	87	86	85	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	92	92	92	92	92	91	91	91	91	91	91	91	91	91	92	94	98	102	103	103	101	98	95	93
Thu	92	92	92	91	91	91	91	90	90	90	89	89	89	89	88	89	90	92	92	90	87	87	87	87
Fri	86	86	86	86	86	87	87	88	88	88	89	89	89	89	89	89	91	94	97	96	94	93	92	90
Sat	90	90	91	91	92	92	93	93	93	93	93	94	94	94	94	94	97	100	103	104	101	99	95	94
Sun	94	94	94	94	93	93	91	90	89	87	85	84	84	83	82	86	90	99	103	103	97	92	89	85
Mon	80	77	77	76	76	76	76	76	77	78	78	79	79	80	80	80	83	85	86	84	82	81	81	81
Tue	81	81	82	82	82	82	82	82	83	84	85	85	86	86	86	86	87	88	88	87	86	85	85	84