22 – 28 Feb 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

102.8Weekly mean modelled AQI · Unhealthy for Sensitive Groups

Mean PM2.5: 35.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+10.9 AQI compared with the previous week’s mean of 91.9.

Highest hourly estimate: 335 in Bangkok · 23 Feb, 11:00 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 Feb	95.3Moderate	55–262	34.8	192 / 192
Thu, 23 Feb	110.2Unhealthy for Sensitive Groups	57–335	51.3	192 / 192
Fri, 24 Feb	127.4Unhealthy for Sensitive Groups	59–296	52.4	192 / 192
Sat, 25 Feb	105.6Unhealthy for Sensitive Groups	59–300	26.2	192 / 192
Sun, 26 Feb	86.8Moderate	59–206	21.8	192 / 192
Mon, 27 Feb	90.3Moderate	56–232	26.5	192 / 192
Tue, 28 Feb	104Unhealthy for Sensitive Groups	60–294	34.8	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	94	94	94	94	94	93	93	93	92	92	91	91	91	91	91	92	95	102	105	104	103	102	100	97
Thu	95	95	94	93	93	93	93	93	93	94	104	111	113	115	118	121	122	126	128	130	130	130	130	130
Fri	130	129	128	127	126	125	123	121	118	117	117	118	120	121	124	128	132	137	139	139	137	135	133	133
Sat	131	117	114	112	111	109	123	119	116	112	109	104	99	97	96	94	93	96	100	101	100	98	93	91
Sun	88	86	84	83	81	81	80	80	79	79	79	79	79	79	80	85	92	99	104	104	104	100	94	87
Mon	84	81	78	76	75	74	74	75	75	75	76	77	78	83	86	96	107	116	122	123	121	116	107	94
Tue	89	87	86	86	87	87	87	88	88	88	89	90	92	97	106	114	125	134	124	126	127	141	135	128

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	203Very Unhealthy	335	105.5	168 / 168
Pattaya	139Unhealthy for Sensitive Groups	300	37.1	168 / 168
Chiang Mai	115.7Unhealthy for Sensitive Groups	211	39.1	168 / 168
Chiang Rai	90Moderate	117	29.8	168 / 168
Khon Kaen	72.6Moderate	101	18.6	168 / 168
Nakhon Ratchasima	71.6Moderate	96	18	168 / 168
Phuket	66.6Moderate	82	18	168 / 168
Hat Yai	63.8Moderate	76	17	168 / 168

City-hours by category

Good: 0

Moderate: 943

Unhealthy for Sensitive Groups: 197

Unhealthy: 62

Very Unhealthy: 133

Hazardous: 9

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	94	94	94	94	94	93	93	93	92	92	91	91	91	91	91	92	95	102	105	104	103	102	100	97
Thu	95	95	94	93	93	93	93	93	93	94	104	111	113	115	118	121	122	126	128	130	130	130	130	130
Fri	130	129	128	127	126	125	123	121	118	117	117	118	120	121	124	128	132	137	139	139	137	135	133	133
Sat	131	117	114	112	111	109	123	119	116	112	109	104	99	97	96	94	93	96	100	101	100	98	93	91
Sun	88	86	84	83	81	81	80	80	79	79	79	79	79	79	80	85	92	99	104	104	104	100	94	87
Mon	84	81	78	76	75	74	74	75	75	75	76	77	78	83	86	96	107	116	122	123	121	116	107	94
Tue	89	87	86	86	87	87	87	88	88	88	89	90	92	97	106	114	125	134	124	126	127	141	135	128

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	94	94	94	94	94	93	93	93	92	92	91	91	91	91	91	92	95	102	105	104	103	102	100	97
Thu	95	95	94	93	93	93	93	93	93	94	104	111	113	115	118	121	122	126	128	130	130	130	130	130
Fri	130	129	128	127	126	125	123	121	118	117	117	118	120	121	124	128	132	137	139	139	137	135	133	133
Sat	131	117	114	112	111	109	123	119	116	112	109	104	99	97	96	94	93	96	100	101	100	98	93	91
Sun	88	86	84	83	81	81	80	80	79	79	79	79	79	79	80	85	92	99	104	104	104	100	94	87
Mon	84	81	78	76	75	74	74	75	75	75	76	77	78	83	86	96	107	116	122	123	121	116	107	94
Tue	89	87	86	86	87	87	87	88	88	88	89	90	92	97	106	114	125	134	124	126	127	141	135	128

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	94	94	94	94	94	93	93	93	92	92	91	91	91	91	91	92	95	102	105	104	103	102	100	97
Thu	95	95	94	93	93	93	93	93	93	94	104	111	113	115	118	121	122	126	128	130	130	130	130	130
Fri	130	129	128	127	126	125	123	121	118	117	117	118	120	121	124	128	132	137	139	139	137	135	133	133
Sat	131	117	114	112	111	109	123	119	116	112	109	104	99	97	96	94	93	96	100	101	100	98	93	91
Sun	88	86	84	83	81	81	80	80	79	79	79	79	79	79	80	85	92	99	104	104	104	100	94	87
Mon	84	81	78	76	75	74	74	75	75	75	76	77	78	83	86	96	107	116	122	123	121	116	107	94
Tue	89	87	86	86	87	87	87	88	88	88	89	90	92	97	106	114	125	134	124	126	127	141	135	128