22 – 28 May 2024 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

49.4Weekly mean modelled AQI · Good

Mean PM2.5: 10.8 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-11.4 AQI compared with the previous week’s mean of 60.8.

Highest hourly estimate: 86 in Nakhon Ratchasima · 28 May, 21:00 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, 22 May	46.8Good	28–70	8.3	192 / 192
Thu, 23 May	46.6Good	28–67	10.8	192 / 192
Fri, 24 May	48.1Good	31–68	8.8	192 / 192
Sat, 25 May	47.4Good	27–60	10.3	192 / 192
Sun, 26 May	49.1Good	24–64	10.3	192 / 192
Mon, 27 May	52.2Moderate	29–76	13.1	192 / 192
Tue, 28 May	55.7Moderate	27–86	14.2	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	52	51	51	50	50	49	48	47	47	47	46	46	46	46	46	45	45	46	46	45	44	44	44	44
Thu	43	43	43	44	44	45	45	45	46	46	47	47	48	48	48	48	48	48	49	49	49	50	50	50
Fri	50	50	50	50	50	49	49	49	49	49	49	48	48	48	48	48	48	48	47	46	46	46	46	46
Sat	46	46	46	46	46	46	46	46	47	47	47	47	48	48	48	48	48	48	49	49	49	49	49	49
Sun	49	50	50	50	50	50	50	50	50	50	50	50	49	49	49	49	49	49	49	48	48	48	49	49
Mon	49	50	50	50	51	51	51	52	52	52	52	52	52	52	53	53	53	53	54	54	54	54	55	55
Tue	55	55	55	55	55	55	55	55	55	55	55	55	55	56	56	56	56	56	56	56	57	57	58	58

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
Khon Kaen	54.7Moderate	76	13	168 / 168
Nakhon Ratchasima	53.8Moderate	86	13.5	168 / 168
Hat Yai	53.6Moderate	68	13.1	168 / 168
Phuket	52.7Moderate	62	11.8	168 / 168
Bangkok	50.5Moderate	65	10	168 / 168
Chiang Mai	45.5Good	65	9	168 / 168
Chiang Rai	44.1Good	70	9	168 / 168
Pattaya	40.7Good	50	7.5	168 / 168

City-hours by category

Good: 645

Moderate: 699

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	52	51	51	50	50	49	48	47	47	47	46	46	46	46	46	45	45	46	46	45	44	44	44	44
Thu	43	43	43	44	44	45	45	45	46	46	47	47	48	48	48	48	48	48	49	49	49	50	50	50
Fri	50	50	50	50	50	49	49	49	49	49	49	48	48	48	48	48	48	48	47	46	46	46	46	46
Sat	46	46	46	46	46	46	46	46	47	47	47	47	48	48	48	48	48	48	49	49	49	49	49	49
Sun	49	50	50	50	50	50	50	50	50	50	50	50	49	49	49	49	49	49	49	48	48	48	49	49
Mon	49	50	50	50	51	51	51	52	52	52	52	52	52	52	53	53	53	53	54	54	54	54	55	55
Tue	55	55	55	55	55	55	55	55	55	55	55	55	55	56	56	56	56	56	56	56	57	57	58	58

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	52	51	51	50	50	49	48	47	47	47	46	46	46	46	46	45	45	46	46	45	44	44	44	44
Thu	43	43	43	44	44	45	45	45	46	46	47	47	48	48	48	48	48	48	49	49	49	50	50	50
Fri	50	50	50	50	50	49	49	49	49	49	49	48	48	48	48	48	48	48	47	46	46	46	46	46
Sat	46	46	46	46	46	46	46	46	47	47	47	47	48	48	48	48	48	48	49	49	49	49	49	49
Sun	49	50	50	50	50	50	50	50	50	50	50	50	49	49	49	49	49	49	49	48	48	48	49	49
Mon	49	50	50	50	51	51	51	52	52	52	52	52	52	52	53	53	53	53	54	54	54	54	55	55
Tue	55	55	55	55	55	55	55	55	55	55	55	55	55	56	56	56	56	56	56	56	57	57	58	58

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	52	51	51	50	50	49	48	47	47	47	46	46	46	46	46	45	45	46	46	45	44	44	44	44
Thu	43	43	43	44	44	45	45	45	46	46	47	47	48	48	48	48	48	48	49	49	49	50	50	50
Fri	50	50	50	50	50	49	49	49	49	49	49	48	48	48	48	48	48	48	47	46	46	46	46	46
Sat	46	46	46	46	46	46	46	46	47	47	47	47	48	48	48	48	48	48	49	49	49	49	49	49
Sun	49	50	50	50	50	50	50	50	50	50	50	50	49	49	49	49	49	49	49	48	48	48	49	49
Mon	49	50	50	50	51	51	51	52	52	52	52	52	52	52	53	53	53	53	54	54	54	54	55	55
Tue	55	55	55	55	55	55	55	55	55	55	55	55	55	56	56	56	56	56	56	56	57	57	58	58