8 – 14 Mar 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

113.9Weekly mean modelled AQI · Unhealthy for Sensitive Groups

Mean PM2.5: 40.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+0.7 AQI compared with the previous week’s mean of 113.2.

Highest hourly estimate: 353 in Bangkok · 8 Mar, 02:00 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 Mar	141.7Unhealthy for Sensitive Groups	60–353	60.1	192 / 192
Thu, 9 Mar	117.8Unhealthy for Sensitive Groups	60–307	35.6	192 / 192
Fri, 10 Mar	105.5Unhealthy for Sensitive Groups	56–260	36	192 / 192
Sat, 11 Mar	107.6Unhealthy for Sensitive Groups	55–161	36	192 / 192
Sun, 12 Mar	105.2Unhealthy for Sensitive Groups	57–156	38.3	192 / 192
Mon, 13 Mar	111.2Unhealthy for Sensitive Groups	61–249	38.4	192 / 192
Tue, 14 Mar	108.7Unhealthy for Sensitive Groups	58–269	36.2	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	141	137	137	137	137	137	151	148	146	144	143	141	140	140	140	140	142	145	148	148	146	143	139	135
Thu	130	127	126	125	124	123	122	121	120	119	117	116	115	113	112	115	117	117	115	114	113	111	108	105
Fri	103	102	101	101	100	100	99	99	99	98	98	98	98	98	102	105	107	113	120	123	121	119	116	112
Sat	105	103	103	104	105	105	106	107	107	108	109	109	109	109	109	109	108	109	113	113	110	109	107	106
Sun	105	105	105	105	105	104	104	103	103	103	103	103	103	104	104	105	106	108	110	110	109	106	107	107
Mon	107	107	107	107	107	107	107	107	107	106	106	106	105	106	110	113	115	116	121	124	124	123	120	116
Tue	109	106	105	105	105	104	105	105	105	105	104	104	103	102	102	103	104	110	117	121	122	123	121	119

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
Bangkok	193Unhealthy	353	85.6	168 / 168
Chiang Mai	143.3Unhealthy for Sensitive Groups	204	53.7	168 / 168
Chiang Rai	135Unhealthy for Sensitive Groups	161	50.8	168 / 168
Pattaya	113.6Unhealthy for Sensitive Groups	290	33.5	168 / 168
Nakhon Ratchasima	103.3Unhealthy for Sensitive Groups	151	33	168 / 168
Khon Kaen	93.1Moderate	133	30.3	168 / 168
Phuket	66.7Moderate	84	17.8	168 / 168
Hat Yai	63.4Moderate	84	15.9	168 / 168

City-hours by category

Good: 0

Moderate: 630

Unhealthy for Sensitive Groups: 447

Unhealthy: 187

Very Unhealthy: 55

Hazardous: 25

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	141	137	137	137	137	137	151	148	146	144	143	141	140	140	140	140	142	145	148	148	146	143	139	135
Thu	130	127	126	125	124	123	122	121	120	119	117	116	115	113	112	115	117	117	115	114	113	111	108	105
Fri	103	102	101	101	100	100	99	99	99	98	98	98	98	98	102	105	107	113	120	123	121	119	116	112
Sat	105	103	103	104	105	105	106	107	107	108	109	109	109	109	109	109	108	109	113	113	110	109	107	106
Sun	105	105	105	105	105	104	104	103	103	103	103	103	103	104	104	105	106	108	110	110	109	106	107	107
Mon	107	107	107	107	107	107	107	107	107	106	106	106	105	106	110	113	115	116	121	124	124	123	120	116
Tue	109	106	105	105	105	104	105	105	105	105	104	104	103	102	102	103	104	110	117	121	122	123	121	119

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	141	137	137	137	137	137	151	148	146	144	143	141	140	140	140	140	142	145	148	148	146	143	139	135
Thu	130	127	126	125	124	123	122	121	120	119	117	116	115	113	112	115	117	117	115	114	113	111	108	105
Fri	103	102	101	101	100	100	99	99	99	98	98	98	98	98	102	105	107	113	120	123	121	119	116	112
Sat	105	103	103	104	105	105	106	107	107	108	109	109	109	109	109	109	108	109	113	113	110	109	107	106
Sun	105	105	105	105	105	104	104	103	103	103	103	103	103	104	104	105	106	108	110	110	109	106	107	107
Mon	107	107	107	107	107	107	107	107	107	106	106	106	105	106	110	113	115	116	121	124	124	123	120	116
Tue	109	106	105	105	105	104	105	105	105	105	104	104	103	102	102	103	104	110	117	121	122	123	121	119

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	141	137	137	137	137	137	151	148	146	144	143	141	140	140	140	140	142	145	148	148	146	143	139	135
Thu	130	127	126	125	124	123	122	121	120	119	117	116	115	113	112	115	117	117	115	114	113	111	108	105
Fri	103	102	101	101	100	100	99	99	99	98	98	98	98	98	102	105	107	113	120	123	121	119	116	112
Sat	105	103	103	104	105	105	106	107	107	108	109	109	109	109	109	109	108	109	113	113	110	109	107	106
Sun	105	105	105	105	105	104	104	103	103	103	103	103	103	104	104	105	106	108	110	110	109	106	107	107
Mon	107	107	107	107	107	107	107	107	107	106	106	106	105	106	110	113	115	116	121	124	124	123	120	116
Tue	109	106	105	105	105	104	105	105	105	105	104	104	103	102	102	103	104	110	117	121	122	123	121	119