1 – 7 Mar 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

113.2Weekly mean modelled AQI · Unhealthy for Sensitive Groups

Mean PM2.5: 44.2 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+10.4 AQI compared with the previous week’s mean of 102.8.

Highest hourly estimate: 413 in Bangkok · 7 Mar, 15:00 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, 1 Mar	116.7Unhealthy for Sensitive Groups	51–298	45.5	192 / 192
Thu, 2 Mar	122.6Unhealthy for Sensitive Groups	50–297	46.5	192 / 192
Fri, 3 Mar	100.8Unhealthy for Sensitive Groups	55–293	33.9	192 / 192
Sat, 4 Mar	102.3Unhealthy for Sensitive Groups	56–247	34.6	192 / 192
Sun, 5 Mar	101.6Unhealthy for Sensitive Groups	60–277	39.2	192 / 192
Mon, 6 Mar	117Unhealthy for Sensitive Groups	67–265	40.7	192 / 192
Tue, 7 Mar	131.5Unhealthy for Sensitive Groups	58–413	68.9	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	121	115	114	111	107	103	103	103	104	104	104	106	110	113	117	127	132	132	129	127	127	128	128	139
Thu	132	129	128	127	127	125	123	121	117	117	117	118	118	118	119	118	123	125	126	126	129	124	121	118
Fri	114	110	107	105	102	100	98	97	95	94	92	91	90	92	95	97	100	104	98	99	100	102	119	117
Sat	113	109	110	110	110	109	108	106	102	98	95	95	95	95	95	95	98	101	104	104	104	102	100	98
Sun	95	94	94	94	93	92	91	91	92	92	93	94	94	95	96	99	102	109	117	122	124	124	122	121
Mon	119	116	115	116	117	118	118	118	116	115	114	112	111	110	109	110	114	120	125	128	127	125	121	118
Tue	114	111	111	112	113	114	115	116	117	119	127	134	140	145	150	154	155	142	144	146	146	145	143	142

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	228.9Very Unhealthy	413	144.7	168 / 168
Pattaya	163.2Unhealthy	284	48.4	168 / 168
Chiang Mai	131.1Unhealthy for Sensitive Groups	200	46.3	168 / 168
Chiang Rai	114.2Unhealthy for Sensitive Groups	137	41.7	168 / 168
Nakhon Ratchasima	71.9Moderate	111	21.8	168 / 168
Khon Kaen	71.2Moderate	105	20.1	168 / 168
Phuket	63.2Moderate	76	15.6	168 / 168
Hat Yai	61.7Moderate	77	14.8	168 / 168

City-hours by category

Good: 5

Moderate: 717

Unhealthy for Sensitive Groups: 335

Unhealthy: 147

Very Unhealthy: 127

Hazardous: 13

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	115	114	111	107	103	103	103	104	104	104	106	110	113	117	127	132	132	129	127	127	128	128	139
Thu	132	129	128	127	127	125	123	121	117	117	117	118	118	118	119	118	123	125	126	126	129	124	121	118
Fri	114	110	107	105	102	100	98	97	95	94	92	91	90	92	95	97	100	104	98	99	100	102	119	117
Sat	113	109	110	110	110	109	108	106	102	98	95	95	95	95	95	95	98	101	104	104	104	102	100	98
Sun	95	94	94	94	93	92	91	91	92	92	93	94	94	95	96	99	102	109	117	122	124	124	122	121
Mon	119	116	115	116	117	118	118	118	116	115	114	112	111	110	109	110	114	120	125	128	127	125	121	118
Tue	114	111	111	112	113	114	115	116	117	119	127	134	140	145	150	154	155	142	144	146	146	145	143	142

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	115	114	111	107	103	103	103	104	104	104	106	110	113	117	127	132	132	129	127	127	128	128	139
Thu	132	129	128	127	127	125	123	121	117	117	117	118	118	118	119	118	123	125	126	126	129	124	121	118
Fri	114	110	107	105	102	100	98	97	95	94	92	91	90	92	95	97	100	104	98	99	100	102	119	117
Sat	113	109	110	110	110	109	108	106	102	98	95	95	95	95	95	95	98	101	104	104	104	102	100	98
Sun	95	94	94	94	93	92	91	91	92	92	93	94	94	95	96	99	102	109	117	122	124	124	122	121
Mon	119	116	115	116	117	118	118	118	116	115	114	112	111	110	109	110	114	120	125	128	127	125	121	118
Tue	114	111	111	112	113	114	115	116	117	119	127	134	140	145	150	154	155	142	144	146	146	145	143	142

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	115	114	111	107	103	103	103	104	104	104	106	110	113	117	127	132	132	129	127	127	128	128	139
Thu	132	129	128	127	127	125	123	121	117	117	117	118	118	118	119	118	123	125	126	126	129	124	121	118
Fri	114	110	107	105	102	100	98	97	95	94	92	91	90	92	95	97	100	104	98	99	100	102	119	117
Sat	113	109	110	110	110	109	108	106	102	98	95	95	95	95	95	95	98	101	104	104	104	102	100	98
Sun	95	94	94	94	93	92	91	91	92	92	93	94	94	95	96	99	102	109	117	122	124	124	122	121
Mon	119	116	115	116	117	118	118	118	116	115	114	112	111	110	109	110	114	120	125	128	127	125	121	118
Tue	114	111	111	112	113	114	115	116	117	119	127	134	140	145	150	154	155	142	144	146	146	145	143	142