16 – 22 Aug 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

52.1Weekly mean modelled AQI · Moderate

Mean PM2.5: 11.7 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+7.7 AQI compared with the previous week’s mean of 44.4.

Highest hourly estimate: 85 in Nakhon Ratchasima · 17 Aug, 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, 16 Aug	47.1Good	18–69	10.6	192 / 192
Thu, 17 Aug	51.5Moderate	20–85	12.1	192 / 192
Fri, 18 Aug	50Good	27–81	10	192 / 192
Sat, 19 Aug	51Moderate	27–65	12.5	192 / 192
Sun, 20 Aug	59.1Moderate	39–78	15.1	192 / 192
Mon, 21 Aug	58Moderate	33–79	12	192 / 192
Tue, 22 Aug	48Good	23–70	9.5	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	48	48	48	47	48	48	48	48	48	47	47	47	47	47	47	46	47	47	47	47	47	47	47	47
Thu	47	48	48	49	49	49	50	50	51	51	52	52	52	53	53	53	54	54	54	54	54	54	53	53
Fri	53	53	52	52	51	51	51	51	50	50	50	50	50	50	49	49	49	49	49	49	49	49	48	49
Sat	49	49	49	49	49	50	50	50	50	50	50	50	51	51	51	52	52	52	52	53	53	54	55	55
Sun	56	56	57	57	57	58	58	58	58	59	59	59	59	60	60	60	61	61	61	61	61	61	61	61
Mon	61	61	60	60	60	60	60	60	60	60	59	59	58	58	58	58	57	56	56	55	55	54	54	53
Tue	53	53	52	51	51	50	50	49	49	48	48	48	47	47	46	46	46	46	46	46	46	46	46	46

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
Nakhon Ratchasima	67.4Moderate	85	18.1	168 / 168
Khon Kaen	63.7Moderate	71	16	168 / 168
Chiang Mai	57.7Moderate	67	12.9	168 / 168
Chiang Rai	57.3Moderate	69	12.8	168 / 168
Bangkok	56.4Moderate	73	13.2	168 / 168
Phuket	46.9Good	52	8.3	168 / 168
Pattaya	35.9Good	54	6.5	168 / 168
Hat Yai	31.4Good	49	5.7	168 / 168

City-hours by category

Good: 501

Moderate: 843

Unhealthy for Sensitive Groups: 0

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	48	48	48	47	48	48	48	48	48	47	47	47	47	47	47	46	47	47	47	47	47	47	47	47
Thu	47	48	48	49	49	49	50	50	51	51	52	52	52	53	53	53	54	54	54	54	54	54	53	53
Fri	53	53	52	52	51	51	51	51	50	50	50	50	50	50	49	49	49	49	49	49	49	49	48	49
Sat	49	49	49	49	49	50	50	50	50	50	50	50	51	51	51	52	52	52	52	53	53	54	55	55
Sun	56	56	57	57	57	58	58	58	58	59	59	59	59	60	60	60	61	61	61	61	61	61	61	61
Mon	61	61	60	60	60	60	60	60	60	60	59	59	58	58	58	58	57	56	56	55	55	54	54	53
Tue	53	53	52	51	51	50	50	49	49	48	48	48	47	47	46	46	46	46	46	46	46	46	46	46

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	48	48	48	47	48	48	48	48	48	47	47	47	47	47	47	46	47	47	47	47	47	47	47	47
Thu	47	48	48	49	49	49	50	50	51	51	52	52	52	53	53	53	54	54	54	54	54	54	53	53
Fri	53	53	52	52	51	51	51	51	50	50	50	50	50	50	49	49	49	49	49	49	49	49	48	49
Sat	49	49	49	49	49	50	50	50	50	50	50	50	51	51	51	52	52	52	52	53	53	54	55	55
Sun	56	56	57	57	57	58	58	58	58	59	59	59	59	60	60	60	61	61	61	61	61	61	61	61
Mon	61	61	60	60	60	60	60	60	60	60	59	59	58	58	58	58	57	56	56	55	55	54	54	53
Tue	53	53	52	51	51	50	50	49	49	48	48	48	47	47	46	46	46	46	46	46	46	46	46	46

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	48	48	48	47	48	48	48	48	48	47	47	47	47	47	47	46	47	47	47	47	47	47	47	47
Thu	47	48	48	49	49	49	50	50	51	51	52	52	52	53	53	53	54	54	54	54	54	54	53	53
Fri	53	53	52	52	51	51	51	51	50	50	50	50	50	50	49	49	49	49	49	49	49	49	48	49
Sat	49	49	49	49	49	50	50	50	50	50	50	50	51	51	51	52	52	52	52	53	53	54	55	55
Sun	56	56	57	57	57	58	58	58	58	59	59	59	59	60	60	60	61	61	61	61	61	61	61	61
Mon	61	61	60	60	60	60	60	60	60	60	59	59	58	58	58	58	57	56	56	55	55	54	54	53
Tue	53	53	52	51	51	50	50	49	49	48	48	48	47	47	46	46	46	46	46	46	46	46	46	46