28 Dec 2022 – 3 Jan 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

84.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 25.5 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-1.9 AQI compared with the previous week’s mean of 86.2.

Highest hourly estimate: 299 in Bangkok · 2 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, 28 Dec	86.2Moderate	55–294	32.5	192 / 192
Thu, 29 Dec	92.3Moderate	52–237	35.4	192 / 192
Fri, 30 Dec	85.3Moderate	51–219	23.3	192 / 192
Sat, 31 Dec	80.2Moderate	53–257	20.8	192 / 192
Sun, 1 Jan	75.3Moderate	52–165	19	192 / 192
Mon, 2 Jan	87.6Moderate	51–299	25.9	192 / 192
Tue, 3 Jan	83.6Moderate	50–232	21.8	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	79	78	78	79	79	80	80	80	81	81	81	81	81	83	84	86	88	96	103	94	95	105	102	98
Thu	94	94	93	93	94	94	93	91	88	86	87	87	88	88	89	89	90	93	99	102	101	99	94	91
Fri	90	90	90	90	89	88	87	86	84	83	82	82	81	80	80	79	81	87	90	91	90	87	81	78
Sat	76	75	75	74	74	73	73	74	74	74	74	74	73	77	78	80	85	91	96	98	96	93	88	80
Sun	78	74	73	73	73	73	74	74	74	74	74	73	73	73	72	72	74	79	84	85	81	79	76	74
Mon	72	71	70	70	70	70	70	71	71	72	73	75	82	86	91	100	111	120	106	123	117	110	105	97
Tue	88	84	81	81	81	80	80	80	79	79	78	78	77	77	76	79	80	87	93	96	97	96	93	85

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	186.8Unhealthy	299	84.6	168 / 168
Pattaya	96.8Moderate	210	21.8	168 / 168
Chiang Mai	84.5Moderate	157	25.9	168 / 168
Khon Kaen	66.3Moderate	91	16.7	168 / 168
Chiang Rai	63.4Moderate	78	15.8	168 / 168
Nakhon Ratchasima	62.4Moderate	84	14.8	168 / 168
Hat Yai	59.5Moderate	66	13.6	168 / 168
Phuket	55.1Moderate	68	11	168 / 168

City-hours by category

Good: 3

Moderate: 1101

Unhealthy for Sensitive Groups: 66

Unhealthy: 101

Very Unhealthy: 73

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	79	78	78	79	79	80	80	80	81	81	81	81	81	83	84	86	88	96	103	94	95	105	102	98
Thu	94	94	93	93	94	94	93	91	88	86	87	87	88	88	89	89	90	93	99	102	101	99	94	91
Fri	90	90	90	90	89	88	87	86	84	83	82	82	81	80	80	79	81	87	90	91	90	87	81	78
Sat	76	75	75	74	74	73	73	74	74	74	74	74	73	77	78	80	85	91	96	98	96	93	88	80
Sun	78	74	73	73	73	73	74	74	74	74	74	73	73	73	72	72	74	79	84	85	81	79	76	74
Mon	72	71	70	70	70	70	70	71	71	72	73	75	82	86	91	100	111	120	106	123	117	110	105	97
Tue	88	84	81	81	81	80	80	80	79	79	78	78	77	77	76	79	80	87	93	96	97	96	93	85

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	79	78	78	79	79	80	80	80	81	81	81	81	81	83	84	86	88	96	103	94	95	105	102	98
Thu	94	94	93	93	94	94	93	91	88	86	87	87	88	88	89	89	90	93	99	102	101	99	94	91
Fri	90	90	90	90	89	88	87	86	84	83	82	82	81	80	80	79	81	87	90	91	90	87	81	78
Sat	76	75	75	74	74	73	73	74	74	74	74	74	73	77	78	80	85	91	96	98	96	93	88	80
Sun	78	74	73	73	73	73	74	74	74	74	74	73	73	73	72	72	74	79	84	85	81	79	76	74
Mon	72	71	70	70	70	70	70	71	71	72	73	75	82	86	91	100	111	120	106	123	117	110	105	97
Tue	88	84	81	81	81	80	80	80	79	79	78	78	77	77	76	79	80	87	93	96	97	96	93	85

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	79	78	78	79	79	80	80	80	81	81	81	81	81	83	84	86	88	96	103	94	95	105	102	98
Thu	94	94	93	93	94	94	93	91	88	86	87	87	88	88	89	89	90	93	99	102	101	99	94	91
Fri	90	90	90	90	89	88	87	86	84	83	82	82	81	80	80	79	81	87	90	91	90	87	81	78
Sat	76	75	75	74	74	73	73	74	74	74	74	74	73	77	78	80	85	91	96	98	96	93	88	80
Sun	78	74	73	73	73	73	74	74	74	74	74	73	73	73	72	72	74	79	84	85	81	79	76	74
Mon	72	71	70	70	70	70	70	71	71	72	73	75	82	86	91	100	111	120	106	123	117	110	105	97
Tue	88	84	81	81	81	80	80	80	79	79	78	78	77	77	76	79	80	87	93	96	97	96	93	85