13 – 19 Dec 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

64.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 15.7 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-8.1 AQI compared with the previous week’s mean of 73.

Highest hourly estimate: 236 in Pattaya · 13 Dec, 01:00 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, 13 Dec	83.3Moderate	38–236	19.1	192 / 192
Thu, 14 Dec	61.9Moderate	44–106	14.5	192 / 192
Fri, 15 Dec	63.9Moderate	30–151	20	192 / 192
Sat, 16 Dec	74.3Moderate	36–155	19.3	192 / 192
Sun, 17 Dec	62.5Moderate	38–130	12.2	192 / 192
Mon, 18 Dec	53.6Moderate	26–126	12.2	192 / 192
Tue, 19 Dec	54.8Moderate	31–100	12.6	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	96	96	95	94	94	93	91	90	85	83	83	82	82	81	80	80	79	78	76	75	74	73	71	70
Thu	69	67	66	65	65	64	63	62	62	62	61	61	61	61	60	60	60	60	60	60	60	60	60	60
Fri	60	60	60	60	61	61	61	61	61	61	61	61	61	61	62	63	64	66	70	72	72	73	73	72
Sat	71	71	72	72	73	73	74	74	74	74	75	75	75	75	75	75	75	76	79	79	78	76	72	71
Sun	70	70	69	68	68	67	66	65	65	64	63	62	62	61	61	60	59	59	59	59	58	57	56	55
Mon	54	54	53	53	52	52	51	51	50	50	50	50	49	50	50	51	54	60	63	64	61	57	55	53
Tue	53	52	52	52	52	52	53	53	53	54	54	54	54	55	55	55	56	61	64	61	57	56	55	54

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	105.4Unhealthy for Sensitive Groups	167	32.8	168 / 168
Chiang Mai	80.1Moderate	100	25	168 / 168
Pattaya	78.5Moderate	236	17	168 / 168
Chiang Rai	58.1Moderate	62	13.2	168 / 168
Phuket	52.6Moderate	63	10.3	168 / 168
Hat Yai	50Good	59	9.6	168 / 168
Khon Kaen	47.7Good	67	9.2	168 / 168
Nakhon Ratchasima	46.9Good	56	8.4	168 / 168

City-hours by category

Good: 338

Moderate: 900

Unhealthy for Sensitive Groups: 59

Unhealthy: 40

Very Unhealthy: 7

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	96	96	95	94	94	93	91	90	85	83	83	82	82	81	80	80	79	78	76	75	74	73	71	70
Thu	69	67	66	65	65	64	63	62	62	62	61	61	61	61	60	60	60	60	60	60	60	60	60	60
Fri	60	60	60	60	61	61	61	61	61	61	61	61	61	61	62	63	64	66	70	72	72	73	73	72
Sat	71	71	72	72	73	73	74	74	74	74	75	75	75	75	75	75	75	76	79	79	78	76	72	71
Sun	70	70	69	68	68	67	66	65	65	64	63	62	62	61	61	60	59	59	59	59	58	57	56	55
Mon	54	54	53	53	52	52	51	51	50	50	50	50	49	50	50	51	54	60	63	64	61	57	55	53
Tue	53	52	52	52	52	52	53	53	53	54	54	54	54	55	55	55	56	61	64	61	57	56	55	54

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	96	96	95	94	94	93	91	90	85	83	83	82	82	81	80	80	79	78	76	75	74	73	71	70
Thu	69	67	66	65	65	64	63	62	62	62	61	61	61	61	60	60	60	60	60	60	60	60	60	60
Fri	60	60	60	60	61	61	61	61	61	61	61	61	61	61	62	63	64	66	70	72	72	73	73	72
Sat	71	71	72	72	73	73	74	74	74	74	75	75	75	75	75	75	75	76	79	79	78	76	72	71
Sun	70	70	69	68	68	67	66	65	65	64	63	62	62	61	61	60	59	59	59	59	58	57	56	55
Mon	54	54	53	53	52	52	51	51	50	50	50	50	49	50	50	51	54	60	63	64	61	57	55	53
Tue	53	52	52	52	52	52	53	53	53	54	54	54	54	55	55	55	56	61	64	61	57	56	55	54

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	96	96	95	94	94	93	91	90	85	83	83	82	82	81	80	80	79	78	76	75	74	73	71	70
Thu	69	67	66	65	65	64	63	62	62	62	61	61	61	61	60	60	60	60	60	60	60	60	60	60
Fri	60	60	60	60	61	61	61	61	61	61	61	61	61	61	62	63	64	66	70	72	72	73	73	72
Sat	71	71	72	72	73	73	74	74	74	74	75	75	75	75	75	75	75	76	79	79	78	76	72	71
Sun	70	70	69	68	68	67	66	65	65	64	63	62	62	61	61	60	59	59	59	59	58	57	56	55
Mon	54	54	53	53	52	52	51	51	50	50	50	50	49	50	50	51	54	60	63	64	61	57	55	53
Tue	53	52	52	52	52	52	53	53	53	54	54	54	54	55	55	55	56	61	64	61	57	56	55	54