18 – 24 Jan 2023 · 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: 28.2 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+10.1 AQI compared with the previous week’s mean of 80.

Highest hourly estimate: 361 in Bangkok · 23 Jan, 16:00 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, 18 Jan	76.7Moderate	44–211	21	192 / 192
Thu, 19 Jan	78Moderate	50–241	20	192 / 192
Fri, 20 Jan	79.7Moderate	43–260	20.8	192 / 192
Sat, 21 Jan	81.5Moderate	51–209	25.7	192 / 192
Sun, 22 Jan	94.9Moderate	52–237	32.3	192 / 192
Mon, 23 Jan	110.8Unhealthy for Sensitive Groups	48–361	47.2	192 / 192
Tue, 24 Jan	108.9Unhealthy for Sensitive Groups	56–292	30.6	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	81	80	78	76	75	74	74	74	74	74	74	74	74	74	74	74	74	79	83	83	83	81	77	76
Thu	75	74	73	72	72	72	72	72	72	72	72	73	73	77	78	81	84	90	93	92	90	88	81	75
Fri	73	71	71	71	71	70	70	70	70	70	69	69	71	75	77	79	87	95	100	101	102	99	94	89
Sat	80	77	75	74	74	75	75	75	75	75	76	76	76	76	76	76	77	86	95	99	101	100	95	92
Sun	90	87	83	84	84	85	86	86	86	87	87	88	89	89	91	94	98	101	103	120	118	116	115	111
Mon	107	107	107	106	103	98	96	96	97	98	99	100	101	106	111	118	128	125	122	125	127	129	128	127
Tue	133	122	120	118	115	112	108	107	106	105	106	107	109	109	109	108	108	108	108	106	103	100	96	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
Bangkok	184.5Unhealthy	361	79.5	168 / 168
Pattaya	119Unhealthy for Sensitive Groups	293	36.3	168 / 168
Chiang Mai	97.5Moderate	164	30.5	168 / 168
Chiang Rai	75.8Moderate	117	21.4	168 / 168
Khon Kaen	65.4Moderate	94	17.2	168 / 168
Nakhon Ratchasima	62.2Moderate	83	15.4	168 / 168
Phuket	59.6Moderate	112	13	168 / 168
Hat Yai	56.6Moderate	64	12.5	168 / 168

City-hours by category

Good: 52

Moderate: 1006

Unhealthy for Sensitive Groups: 79

Unhealthy: 128

Very Unhealthy: 77

Hazardous: 2

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	81	80	78	76	75	74	74	74	74	74	74	74	74	74	74	74	74	79	83	83	83	81	77	76
Thu	75	74	73	72	72	72	72	72	72	72	72	73	73	77	78	81	84	90	93	92	90	88	81	75
Fri	73	71	71	71	71	70	70	70	70	70	69	69	71	75	77	79	87	95	100	101	102	99	94	89
Sat	80	77	75	74	74	75	75	75	75	75	76	76	76	76	76	76	77	86	95	99	101	100	95	92
Sun	90	87	83	84	84	85	86	86	86	87	87	88	89	89	91	94	98	101	103	120	118	116	115	111
Mon	107	107	107	106	103	98	96	96	97	98	99	100	101	106	111	118	128	125	122	125	127	129	128	127
Tue	133	122	120	118	115	112	108	107	106	105	106	107	109	109	109	108	108	108	108	106	103	100	96	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	81	80	78	76	75	74	74	74	74	74	74	74	74	74	74	74	74	79	83	83	83	81	77	76
Thu	75	74	73	72	72	72	72	72	72	72	72	73	73	77	78	81	84	90	93	92	90	88	81	75
Fri	73	71	71	71	71	70	70	70	70	70	69	69	71	75	77	79	87	95	100	101	102	99	94	89
Sat	80	77	75	74	74	75	75	75	75	75	76	76	76	76	76	76	77	86	95	99	101	100	95	92
Sun	90	87	83	84	84	85	86	86	86	87	87	88	89	89	91	94	98	101	103	120	118	116	115	111
Mon	107	107	107	106	103	98	96	96	97	98	99	100	101	106	111	118	128	125	122	125	127	129	128	127
Tue	133	122	120	118	115	112	108	107	106	105	106	107	109	109	109	108	108	108	108	106	103	100	96	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	81	80	78	76	75	74	74	74	74	74	74	74	74	74	74	74	74	79	83	83	83	81	77	76
Thu	75	74	73	72	72	72	72	72	72	72	72	73	73	77	78	81	84	90	93	92	90	88	81	75
Fri	73	71	71	71	71	70	70	70	70	70	69	69	71	75	77	79	87	95	100	101	102	99	94	89
Sat	80	77	75	74	74	75	75	75	75	75	76	76	76	76	76	76	77	86	95	99	101	100	95	92
Sun	90	87	83	84	84	85	86	86	86	87	87	88	89	89	91	94	98	101	103	120	118	116	115	111
Mon	107	107	107	106	103	98	96	96	97	98	99	100	101	106	111	118	128	125	122	125	127	129	128	127
Tue	133	122	120	118	115	112	108	107	106	105	106	107	109	109	109	108	108	108	108	106	103	100	96	93