8 – 14 Apr 2026 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

90.1Weekly mean modelled AQI · Moderate

Mean PM2.5: 27.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-7.6 AQI compared with the previous week’s mean of 97.7.

Highest hourly estimate: 207 in Bangkok · 14 Apr, 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, 8 Apr	95.2Moderate	53–160	27.8	192 / 192
Thu, 9 Apr	84.6Moderate	53–155	23.4	192 / 192
Fri, 10 Apr	80.6Moderate	53–150	22.9	192 / 192
Sat, 11 Apr	87Moderate	54–202	24.9	192 / 192
Sun, 12 Apr	92.2Moderate	41–177	29.1	192 / 192
Mon, 13 Apr	94.6Moderate	42–180	32	192 / 192
Tue, 14 Apr	96.8Moderate	47–207	31.5	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	93	92	92	92	92	92	92	93	93	93	93	92	92	92	92	95	100	105	107	106	102	99	95	90
Thu	89	87	86	86	85	85	84	84	83	83	83	82	81	81	81	82	86	90	92	91	88	84	82	79
Fri	78	78	79	79	79	80	80	80	80	79	79	79	79	78	79	79	82	86	89	88	86	82	80	80
Sat	79	78	77	77	77	77	77	77	77	77	77	78	79	79	84	90	97	105	109	110	108	104	100	96
Sun	91	87	84	83	83	83	83	83	84	84	85	85	86	86	90	96	103	111	116	113	109	102	96	91
Mon	89	89	90	91	92	92	93	94	93	93	92	92	93	92	92	94	99	105	108	106	101	96	92	92
Tue	91	91	91	91	90	90	90	90	90	90	90	90	90	94	97	104	110	114	115	113	109	103	99	93

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	144.7Unhealthy for Sensitive Groups	180	59.2	168 / 168
Chiang Mai	126.9Unhealthy for Sensitive Groups	163	45.6	168 / 168
Khon Kaen	98.5Moderate	157	30.3	168 / 168
Bangkok	93.9Moderate	207	21.6	168 / 168
Nakhon Ratchasima	83.1Moderate	116	24.6	168 / 168
Hat Yai	62Moderate	101	13.9	168 / 168
Pattaya	60.7Moderate	90	13.3	168 / 168
Phuket	51.4Moderate	57	10.5	168 / 168

City-hours by category

Good: 50

Moderate: 883

Unhealthy for Sensitive Groups: 274

Unhealthy: 132

Very Unhealthy: 5

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	93	92	92	92	92	92	92	93	93	93	93	92	92	92	92	95	100	105	107	106	102	99	95	90
Thu	89	87	86	86	85	85	84	84	83	83	83	82	81	81	81	82	86	90	92	91	88	84	82	79
Fri	78	78	79	79	79	80	80	80	80	79	79	79	79	78	79	79	82	86	89	88	86	82	80	80
Sat	79	78	77	77	77	77	77	77	77	77	77	78	79	79	84	90	97	105	109	110	108	104	100	96
Sun	91	87	84	83	83	83	83	83	84	84	85	85	86	86	90	96	103	111	116	113	109	102	96	91
Mon	89	89	90	91	92	92	93	94	93	93	92	92	93	92	92	94	99	105	108	106	101	96	92	92
Tue	91	91	91	91	90	90	90	90	90	90	90	90	90	94	97	104	110	114	115	113	109	103	99	93

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	93	92	92	92	92	92	92	93	93	93	93	92	92	92	92	95	100	105	107	106	102	99	95	90
Thu	89	87	86	86	85	85	84	84	83	83	83	82	81	81	81	82	86	90	92	91	88	84	82	79
Fri	78	78	79	79	79	80	80	80	80	79	79	79	79	78	79	79	82	86	89	88	86	82	80	80
Sat	79	78	77	77	77	77	77	77	77	77	77	78	79	79	84	90	97	105	109	110	108	104	100	96
Sun	91	87	84	83	83	83	83	83	84	84	85	85	86	86	90	96	103	111	116	113	109	102	96	91
Mon	89	89	90	91	92	92	93	94	93	93	92	92	93	92	92	94	99	105	108	106	101	96	92	92
Tue	91	91	91	91	90	90	90	90	90	90	90	90	90	94	97	104	110	114	115	113	109	103	99	93

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	93	92	92	92	92	92	92	93	93	93	93	92	92	92	92	95	100	105	107	106	102	99	95	90
Thu	89	87	86	86	85	85	84	84	83	83	83	82	81	81	81	82	86	90	92	91	88	84	82	79
Fri	78	78	79	79	79	80	80	80	80	79	79	79	79	78	79	79	82	86	89	88	86	82	80	80
Sat	79	78	77	77	77	77	77	77	77	77	77	78	79	79	84	90	97	105	109	110	108	104	100	96
Sun	91	87	84	83	83	83	83	83	84	84	85	85	86	86	90	96	103	111	116	113	109	102	96	91
Mon	89	89	90	91	92	92	93	94	93	93	92	92	93	92	92	94	99	105	108	106	101	96	92	92
Tue	91	91	91	91	90	90	90	90	90	90	90	90	90	94	97	104	110	114	115	113	109	103	99	93