25 – 31 Jan 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

91.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 28 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+1.8 AQI compared with the previous week’s mean of 90.1.

Highest hourly estimate: 282 in Bangkok · 27 Jan, 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, 25 Jan	84.9Moderate	43–243	20.9	192 / 192
Thu, 26 Jan	88.2Moderate	39–248	29.8	192 / 192
Fri, 27 Jan	108.8Unhealthy for Sensitive Groups	50–282	35	192 / 192
Sat, 28 Jan	90.7Moderate	54–221	21.1	192 / 192
Sun, 29 Jan	78.5Moderate	54–209	20.8	192 / 192
Mon, 30 Jan	90Moderate	57–236	28.1	192 / 192
Tue, 31 Jan	102.4Unhealthy for Sensitive Groups	59–246	40.5	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	91	90	88	86	83	81	78	76	75	73	72	71	71	73	76	80	87	94	101	105	103	99	95	89
Thu	79	76	75	74	75	76	77	78	78	78	79	79	79	79	79	83	94	101	110	115	116	115	114	112
Fri	107	106	105	104	101	95	96	97	98	99	100	104	105	109	110	123	118	121	123	122	131	123	114	104
Sat	97	93	91	89	88	86	86	88	88	89	89	89	88	87	86	86	91	98	101	100	97	94	91	85
Sun	77	76	74	73	72	72	72	72	72	71	72	72	72	72	73	79	86	93	96	95	91	89	85	80
Mon	75	74	73	73	73	74	74	74	74	75	75	75	77	79	86	97	106	116	123	126	125	121	114	102
Tue	93	91	91	92	93	93	94	95	95	96	96	96	96	97	97	99	104	108	110	124	123	124	126	127

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	163.9Unhealthy	282	65.8	168 / 168
Chiang Mai	118.2Unhealthy for Sensitive Groups	228	36.6	168 / 168
Pattaya	111.1Unhealthy for Sensitive Groups	248	27.1	168 / 168
Khon Kaen	78.2Moderate	115	24.4	168 / 168
Chiang Rai	75.8Moderate	99	23.6	168 / 168
Nakhon Ratchasima	68.6Moderate	85	19.9	168 / 168
Phuket	60.3Moderate	119	12.6	168 / 168
Hat Yai	59.4Moderate	65	14.2	168 / 168

City-hours by category

Good: 33

Moderate: 977

Unhealthy for Sensitive Groups: 159

Unhealthy: 105

Very Unhealthy: 70

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	91	90	88	86	83	81	78	76	75	73	72	71	71	73	76	80	87	94	101	105	103	99	95	89
Thu	79	76	75	74	75	76	77	78	78	78	79	79	79	79	79	83	94	101	110	115	116	115	114	112
Fri	107	106	105	104	101	95	96	97	98	99	100	104	105	109	110	123	118	121	123	122	131	123	114	104
Sat	97	93	91	89	88	86	86	88	88	89	89	89	88	87	86	86	91	98	101	100	97	94	91	85
Sun	77	76	74	73	72	72	72	72	72	71	72	72	72	72	73	79	86	93	96	95	91	89	85	80
Mon	75	74	73	73	73	74	74	74	74	75	75	75	77	79	86	97	106	116	123	126	125	121	114	102
Tue	93	91	91	92	93	93	94	95	95	96	96	96	96	97	97	99	104	108	110	124	123	124	126	127

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	91	90	88	86	83	81	78	76	75	73	72	71	71	73	76	80	87	94	101	105	103	99	95	89
Thu	79	76	75	74	75	76	77	78	78	78	79	79	79	79	79	83	94	101	110	115	116	115	114	112
Fri	107	106	105	104	101	95	96	97	98	99	100	104	105	109	110	123	118	121	123	122	131	123	114	104
Sat	97	93	91	89	88	86	86	88	88	89	89	89	88	87	86	86	91	98	101	100	97	94	91	85
Sun	77	76	74	73	72	72	72	72	72	71	72	72	72	72	73	79	86	93	96	95	91	89	85	80
Mon	75	74	73	73	73	74	74	74	74	75	75	75	77	79	86	97	106	116	123	126	125	121	114	102
Tue	93	91	91	92	93	93	94	95	95	96	96	96	96	97	97	99	104	108	110	124	123	124	126	127

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	91	90	88	86	83	81	78	76	75	73	72	71	71	73	76	80	87	94	101	105	103	99	95	89
Thu	79	76	75	74	75	76	77	78	78	78	79	79	79	79	79	83	94	101	110	115	116	115	114	112
Fri	107	106	105	104	101	95	96	97	98	99	100	104	105	109	110	123	118	121	123	122	131	123	114	104
Sat	97	93	91	89	88	86	86	88	88	89	89	89	88	87	86	86	91	98	101	100	97	94	91	85
Sun	77	76	74	73	72	72	72	72	72	71	72	72	72	72	73	79	86	93	96	95	91	89	85	80
Mon	75	74	73	73	73	74	74	74	74	75	75	75	77	79	86	97	106	116	123	126	125	121	114	102
Tue	93	91	91	92	93	93	94	95	95	96	96	96	96	97	97	99	104	108	110	124	123	124	126	127