20 – 26 Dec 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

58Weekly mean modelled AQI · Moderate

Mean PM2.5: 14 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-6.9 AQI compared with the previous week’s mean of 64.9.

Highest hourly estimate: 112 in Bangkok · 25 Dec, 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, 20 Dec	53.7Moderate	27–88	11.7	192 / 192
Thu, 21 Dec	52.1Moderate	33–93	10.6	192 / 192
Fri, 22 Dec	53.5Moderate	33–75	12.7	192 / 192
Sat, 23 Dec	57.6Moderate	38–92	14	192 / 192
Sun, 24 Dec	60.3Moderate	46–76	15.2	192 / 192
Mon, 25 Dec	62.4Moderate	40–112	17.1	192 / 192
Tue, 26 Dec	66.8Moderate	40–111	16.9	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	54	53	53	53	53	53	53	52	52	52	52	51	51	51	51	52	53	55	59	60	59	58	57	54
Thu	53	52	52	52	51	51	51	51	51	51	51	51	51	51	51	52	53	54	56	56	54	53	52	51
Fri	51	51	51	51	51	51	51	51	51	52	52	53	53	53	54	54	55	56	57	59	59	58	57	56
Sat	56	56	56	56	55	56	56	56	56	56	57	57	57	58	58	58	59	59	61	62	62	61	59	59
Sun	59	59	59	60	60	60	60	60	60	60	60	60	60	60	60	61	61	61	61	61	61	62	62	62
Mon	62	62	62	62	62	62	62	61	61	61	61	61	61	61	61	62	62	63	65	67	67	65	64	64
Tue	65	65	66	66	66	66	67	67	67	67	67	67	67	67	68	68	67	68	70	70	68	66	66	65

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	74Moderate	112	21.3	168 / 168
Chiang Mai	72.6Moderate	93	20.8	168 / 168
Khon Kaen	61.9Moderate	76	15.9	168 / 168
Chiang Rai	59.3Moderate	70	14.2	168 / 168
Nakhon Ratchasima	52.6Moderate	70	11.8	168 / 168
Hat Yai	52.3Moderate	59	10.8	168 / 168
Pattaya	48Good	62	9.8	168 / 168
Phuket	43.7Good	62	7.6	168 / 168

City-hours by category

Good: 386

Moderate: 952

Unhealthy for Sensitive Groups: 6

Unhealthy: 0

Very Unhealthy: 0

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	54	53	53	53	53	53	53	52	52	52	52	51	51	51	51	52	53	55	59	60	59	58	57	54
Thu	53	52	52	52	51	51	51	51	51	51	51	51	51	51	51	52	53	54	56	56	54	53	52	51
Fri	51	51	51	51	51	51	51	51	51	52	52	53	53	53	54	54	55	56	57	59	59	58	57	56
Sat	56	56	56	56	55	56	56	56	56	56	57	57	57	58	58	58	59	59	61	62	62	61	59	59
Sun	59	59	59	60	60	60	60	60	60	60	60	60	60	60	60	61	61	61	61	61	61	62	62	62
Mon	62	62	62	62	62	62	62	61	61	61	61	61	61	61	61	62	62	63	65	67	67	65	64	64
Tue	65	65	66	66	66	66	67	67	67	67	67	67	67	67	68	68	67	68	70	70	68	66	66	65

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	54	53	53	53	53	53	53	52	52	52	52	51	51	51	51	52	53	55	59	60	59	58	57	54
Thu	53	52	52	52	51	51	51	51	51	51	51	51	51	51	51	52	53	54	56	56	54	53	52	51
Fri	51	51	51	51	51	51	51	51	51	52	52	53	53	53	54	54	55	56	57	59	59	58	57	56
Sat	56	56	56	56	55	56	56	56	56	56	57	57	57	58	58	58	59	59	61	62	62	61	59	59
Sun	59	59	59	60	60	60	60	60	60	60	60	60	60	60	60	61	61	61	61	61	61	62	62	62
Mon	62	62	62	62	62	62	62	61	61	61	61	61	61	61	61	62	62	63	65	67	67	65	64	64
Tue	65	65	66	66	66	66	67	67	67	67	67	67	67	67	68	68	67	68	70	70	68	66	66	65

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	54	53	53	53	53	53	53	52	52	52	52	51	51	51	51	52	53	55	59	60	59	58	57	54
Thu	53	52	52	52	51	51	51	51	51	51	51	51	51	51	51	52	53	54	56	56	54	53	52	51
Fri	51	51	51	51	51	51	51	51	51	52	52	53	53	53	54	54	55	56	57	59	59	58	57	56
Sat	56	56	56	56	55	56	56	56	56	56	57	57	57	58	58	58	59	59	61	62	62	61	59	59
Sun	59	59	59	60	60	60	60	60	60	60	60	60	60	60	60	61	61	61	61	61	61	62	62	62
Mon	62	62	62	62	62	62	62	61	61	61	61	61	61	61	61	62	62	63	65	67	67	65	64	64
Tue	65	65	66	66	66	66	67	67	67	67	67	67	67	67	68	68	67	68	70	70	68	66	66	65