4 – 10 Jan 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

81.4Weekly mean modelled AQI · Moderate

Mean PM2.5: 23.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-2.9 AQI compared with the previous week’s mean of 84.3.

Highest hourly estimate: 293 in Bangkok · 4 Jan, 19:00 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, 4 Jan	82.8Moderate	48–293	21	192 / 192
Thu, 5 Jan	80.7Moderate	44–244	18.7	192 / 192
Fri, 6 Jan	67.2Moderate	40–174	12.7	192 / 192
Sat, 7 Jan	59.5Moderate	38–170	18.3	192 / 192
Sun, 8 Jan	84.5Moderate	42–236	28.2	192 / 192
Mon, 9 Jan	97.9Moderate	44–293	32	192 / 192
Tue, 10 Jan	97.3Moderate	35–288	30.9	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	80	75	74	74	74	74	74	73	73	73	73	73	73	77	79	81	86	94	100	104	105	103	100	95
Thu	87	82	77	72	72	72	72	72	72	72	72	73	75	76	78	81	88	94	99	99	97	93	86	76
Fri	73	69	69	69	69	69	69	69	68	67	67	67	67	67	67	66	67	70	72	70	67	62	59	57
Sat	56	55	55	54	54	54	54	54	55	56	56	56	57	57	58	59	63	67	70	72	70	68	64	66
Sun	67	69	70	72	73	75	76	77	77	77	78	79	79	80	82	86	96	104	108	109	106	102	96	91
Mon	86	84	85	85	86	87	88	89	90	91	90	90	90	91	95	101	109	117	122	123	119	116	111	105
Tue	99	95	88	88	88	87	87	87	86	86	88	90	94	99	101	112	111	110	108	109	107	105	112	100

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	171Unhealthy	293	70.9	168 / 168
Pattaya	106.3Unhealthy for Sensitive Groups	247	24	168 / 168
Chiang Mai	77.7Moderate	112	23.4	168 / 168
Phuket	64.5Moderate	115	12.5	168 / 168
Khon Kaen	62.2Moderate	77	15.4	168 / 168
Chiang Rai	60.1Moderate	70	14.9	168 / 168
Nakhon Ratchasima	57.3Moderate	77	13.3	168 / 168
Hat Yai	52Moderate	62	10.5	168 / 168

City-hours by category

Good: 188

Moderate: 925

Unhealthy for Sensitive Groups: 74

Unhealthy: 95

Very Unhealthy: 62

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	80	75	74	74	74	74	74	73	73	73	73	73	73	77	79	81	86	94	100	104	105	103	100	95
Thu	87	82	77	72	72	72	72	72	72	72	72	73	75	76	78	81	88	94	99	99	97	93	86	76
Fri	73	69	69	69	69	69	69	69	68	67	67	67	67	67	67	66	67	70	72	70	67	62	59	57
Sat	56	55	55	54	54	54	54	54	55	56	56	56	57	57	58	59	63	67	70	72	70	68	64	66
Sun	67	69	70	72	73	75	76	77	77	77	78	79	79	80	82	86	96	104	108	109	106	102	96	91
Mon	86	84	85	85	86	87	88	89	90	91	90	90	90	91	95	101	109	117	122	123	119	116	111	105
Tue	99	95	88	88	88	87	87	87	86	86	88	90	94	99	101	112	111	110	108	109	107	105	112	100

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	80	75	74	74	74	74	74	73	73	73	73	73	73	77	79	81	86	94	100	104	105	103	100	95
Thu	87	82	77	72	72	72	72	72	72	72	72	73	75	76	78	81	88	94	99	99	97	93	86	76
Fri	73	69	69	69	69	69	69	69	68	67	67	67	67	67	67	66	67	70	72	70	67	62	59	57
Sat	56	55	55	54	54	54	54	54	55	56	56	56	57	57	58	59	63	67	70	72	70	68	64	66
Sun	67	69	70	72	73	75	76	77	77	77	78	79	79	80	82	86	96	104	108	109	106	102	96	91
Mon	86	84	85	85	86	87	88	89	90	91	90	90	90	91	95	101	109	117	122	123	119	116	111	105
Tue	99	95	88	88	88	87	87	87	86	86	88	90	94	99	101	112	111	110	108	109	107	105	112	100

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	80	75	74	74	74	74	74	73	73	73	73	73	73	77	79	81	86	94	100	104	105	103	100	95
Thu	87	82	77	72	72	72	72	72	72	72	72	73	75	76	78	81	88	94	99	99	97	93	86	76
Fri	73	69	69	69	69	69	69	69	68	67	67	67	67	67	67	66	67	70	72	70	67	62	59	57
Sat	56	55	55	54	54	54	54	54	55	56	56	56	57	57	58	59	63	67	70	72	70	68	64	66
Sun	67	69	70	72	73	75	76	77	77	77	78	79	79	80	82	86	96	104	108	109	106	102	96	91
Mon	86	84	85	85	86	87	88	89	90	91	90	90	90	91	95	101	109	117	122	123	119	116	111	105
Tue	99	95	88	88	88	87	87	87	86	86	88	90	94	99	101	112	111	110	108	109	107	105	112	100