26 Mar – 1 Apr 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

104.6Weekly mean modelled AQI · Unhealthy for Sensitive Groups

Mean PM2.5: 33.3 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-22.9 AQI compared with the previous week’s mean of 127.5.

Highest hourly estimate: 235 in Bangkok · 1 Apr, 20:00 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, 26 Mar	115.9Unhealthy for Sensitive Groups	75–196	35.8	192 / 192
Thu, 27 Mar	104.8Unhealthy for Sensitive Groups	71–161	32.5	192 / 192
Fri, 28 Mar	103Unhealthy for Sensitive Groups	65–205	30.9	192 / 192
Sat, 29 Mar	108.8Unhealthy for Sensitive Groups	66–186	41.4	192 / 192
Sun, 30 Mar	109Unhealthy for Sensitive Groups	64–171	35.4	192 / 192
Mon, 31 Mar	94.1Moderate	60–216	26.1	192 / 192
Tue, 1 Apr	96.4Moderate	45–235	31	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	121	117	114	114	113	113	112	111	111	110	110	110	110	110	110	114	123	131	134	130	124	118	113	108
Thu	105	103	103	102	102	101	101	100	100	99	99	99	98	98	98	102	112	122	126	123	116	109	102	98
Fri	96	96	96	96	96	95	95	95	94	93	92	92	91	92	96	106	120	130	134	131	123	113	103	98
Sat	93	93	94	94	95	96	96	97	99	100	102	104	105	106	109	117	127	135	137	134	128	122	117	113
Sun	112	112	112	112	112	112	111	111	110	109	108	107	106	106	105	106	108	111	112	111	109	107	105	103
Mon	100	100	99	98	97	96	95	94	92	90	88	87	86	87	89	88	92	96	99	100	99	98	95	92
Tue	88	84	84	84	84	85	86	86	88	89	90	91	92	93	93	96	104	111	116	119	118	115	110	107

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	145.4Unhealthy for Sensitive Groups	176	57.4	168 / 168
Bangkok	122.8Unhealthy for Sensitive Groups	235	37.3	168 / 168
Chiang Mai	120.9Unhealthy for Sensitive Groups	172	42.6	168 / 168
Khon Kaen	110.3Unhealthy for Sensitive Groups	196	34	168 / 168
Nakhon Ratchasima	107.1Unhealthy for Sensitive Groups	150	35.1	168 / 168
Pattaya	84.6Moderate	147	21.8	168 / 168
Phuket	74.1Moderate	130	19.5	168 / 168
Hat Yai	71.3Moderate	103	18.7	168 / 168

City-hours by category

Good: 5

Moderate: 728

Unhealthy for Sensitive Groups: 440

Unhealthy: 155

Very Unhealthy: 16

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	121	117	114	114	113	113	112	111	111	110	110	110	110	110	110	114	123	131	134	130	124	118	113	108
Thu	105	103	103	102	102	101	101	100	100	99	99	99	98	98	98	102	112	122	126	123	116	109	102	98
Fri	96	96	96	96	96	95	95	95	94	93	92	92	91	92	96	106	120	130	134	131	123	113	103	98
Sat	93	93	94	94	95	96	96	97	99	100	102	104	105	106	109	117	127	135	137	134	128	122	117	113
Sun	112	112	112	112	112	112	111	111	110	109	108	107	106	106	105	106	108	111	112	111	109	107	105	103
Mon	100	100	99	98	97	96	95	94	92	90	88	87	86	87	89	88	92	96	99	100	99	98	95	92
Tue	88	84	84	84	84	85	86	86	88	89	90	91	92	93	93	96	104	111	116	119	118	115	110	107

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	121	117	114	114	113	113	112	111	111	110	110	110	110	110	110	114	123	131	134	130	124	118	113	108
Thu	105	103	103	102	102	101	101	100	100	99	99	99	98	98	98	102	112	122	126	123	116	109	102	98
Fri	96	96	96	96	96	95	95	95	94	93	92	92	91	92	96	106	120	130	134	131	123	113	103	98
Sat	93	93	94	94	95	96	96	97	99	100	102	104	105	106	109	117	127	135	137	134	128	122	117	113
Sun	112	112	112	112	112	112	111	111	110	109	108	107	106	106	105	106	108	111	112	111	109	107	105	103
Mon	100	100	99	98	97	96	95	94	92	90	88	87	86	87	89	88	92	96	99	100	99	98	95	92
Tue	88	84	84	84	84	85	86	86	88	89	90	91	92	93	93	96	104	111	116	119	118	115	110	107

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	121	117	114	114	113	113	112	111	111	110	110	110	110	110	110	114	123	131	134	130	124	118	113	108
Thu	105	103	103	102	102	101	101	100	100	99	99	99	98	98	98	102	112	122	126	123	116	109	102	98
Fri	96	96	96	96	96	95	95	95	94	93	92	92	91	92	96	106	120	130	134	131	123	113	103	98
Sat	93	93	94	94	95	96	96	97	99	100	102	104	105	106	109	117	127	135	137	134	128	122	117	113
Sun	112	112	112	112	112	112	111	111	110	109	108	107	106	106	105	106	108	111	112	111	109	107	105	103
Mon	100	100	99	98	97	96	95	94	92	90	88	87	86	87	89	88	92	96	99	100	99	98	95	92
Tue	88	84	84	84	84	85	86	86	88	89	90	91	92	93	93	96	104	111	116	119	118	115	110	107