17 – 23 Jan 2024 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

80.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 23.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+9.2 AQI compared with the previous week’s mean of 71.1.

Highest hourly estimate: 299 in Bangkok · 20 Jan, 18:00 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, 17 Jan	62.3Moderate	34–113	16.5	192 / 192
Thu, 18 Jan	75.5Moderate	51–213	23	192 / 192
Fri, 19 Jan	94.3Moderate	51–285	33.6	192 / 192
Sat, 20 Jan	97.1Moderate	48–299	30.8	192 / 192
Sun, 21 Jan	81Moderate	51–227	20.4	192 / 192
Mon, 22 Jan	77.9Moderate	51–207	21.3	192 / 192
Tue, 23 Jan	73.9Moderate	47–162	17.9	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	59	59	59	59	59	59	59	59	60	60	60	60	61	61	61	61	63	67	70	70	68	68	67	66
Thu	65	65	65	66	67	67	67	68	68	69	69	70	70	70	71	72	75	84	91	95	97	97	95	92
Fri	91	91	91	90	90	89	87	85	83	82	81	82	82	84	90	95	98	105	111	113	114	113	110	106
Sat	101	100	99	99	98	96	95	94	93	92	90	90	89	90	92	94	99	107	112	99	97	107	103	97
Sun	90	84	82	81	80	79	79	78	78	77	77	77	77	77	77	78	82	88	92	92	88	82	78	73
Mon	72	72	73	73	73	74	74	74	74	74	74	73	73	73	73	73	78	88	93	92	89	88	87	84
Tue	81	78	75	75	74	75	75	75	75	75	75	74	74	74	74	73	73	72	73	73	73	72	71	69

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	157.1Unhealthy	299	65.6	168 / 168
Pattaya	118.4Unhealthy for Sensitive Groups	272	34	168 / 168
Phuket	67.4Moderate	92	16.3	168 / 168
Nakhon Ratchasima	66.2Moderate	144	16.8	168 / 168
Chiang Mai	65.4Moderate	76	16.9	168 / 168
Hat Yai	57Moderate	65	12.5	168 / 168
Khon Kaen	55.7Moderate	66	12.7	168 / 168
Chiang Rai	55.3Moderate	63	12.1	168 / 168

City-hours by category

Good: 66

Moderate: 1063

Unhealthy for Sensitive Groups: 79

Unhealthy: 79

Very Unhealthy: 57

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	59	59	59	59	59	59	59	59	60	60	60	60	61	61	61	61	63	67	70	70	68	68	67	66
Thu	65	65	65	66	67	67	67	68	68	69	69	70	70	70	71	72	75	84	91	95	97	97	95	92
Fri	91	91	91	90	90	89	87	85	83	82	81	82	82	84	90	95	98	105	111	113	114	113	110	106
Sat	101	100	99	99	98	96	95	94	93	92	90	90	89	90	92	94	99	107	112	99	97	107	103	97
Sun	90	84	82	81	80	79	79	78	78	77	77	77	77	77	77	78	82	88	92	92	88	82	78	73
Mon	72	72	73	73	73	74	74	74	74	74	74	73	73	73	73	73	78	88	93	92	89	88	87	84
Tue	81	78	75	75	74	75	75	75	75	75	75	74	74	74	74	73	73	72	73	73	73	72	71	69

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	59	59	59	59	59	59	59	59	60	60	60	60	61	61	61	61	63	67	70	70	68	68	67	66
Thu	65	65	65	66	67	67	67	68	68	69	69	70	70	70	71	72	75	84	91	95	97	97	95	92
Fri	91	91	91	90	90	89	87	85	83	82	81	82	82	84	90	95	98	105	111	113	114	113	110	106
Sat	101	100	99	99	98	96	95	94	93	92	90	90	89	90	92	94	99	107	112	99	97	107	103	97
Sun	90	84	82	81	80	79	79	78	78	77	77	77	77	77	77	78	82	88	92	92	88	82	78	73
Mon	72	72	73	73	73	74	74	74	74	74	74	73	73	73	73	73	78	88	93	92	89	88	87	84
Tue	81	78	75	75	74	75	75	75	75	75	75	74	74	74	74	73	73	72	73	73	73	72	71	69

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	59	59	59	59	59	59	59	59	60	60	60	60	61	61	61	61	63	67	70	70	68	68	67	66
Thu	65	65	65	66	67	67	67	68	68	69	69	70	70	70	71	72	75	84	91	95	97	97	95	92
Fri	91	91	91	90	90	89	87	85	83	82	81	82	82	84	90	95	98	105	111	113	114	113	110	106
Sat	101	100	99	99	98	96	95	94	93	92	90	90	89	90	92	94	99	107	112	99	97	107	103	97
Sun	90	84	82	81	80	79	79	78	78	77	77	77	77	77	77	78	82	88	92	92	88	82	78	73
Mon	72	72	73	73	73	74	74	74	74	74	74	73	73	73	73	73	78	88	93	92	89	88	87	84
Tue	81	78	75	75	74	75	75	75	75	75	75	74	74	74	74	73	73	72	73	73	73	72	71	69