19 – 25 Jul 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

46.7Weekly mean modelled AQI · Good

Mean PM2.5: 9.9 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-0.5 AQI compared with the previous week’s mean of 47.2.

Highest hourly estimate: 84 in Nakhon Ratchasima · 25 Jul, 09:00 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, 19 Jul	39.2Good	16–62	7.6	192 / 192
Thu, 20 Jul	42.2Good	15–61	9.5	192 / 192
Fri, 21 Jul	50Good	27–65	10.5	192 / 192
Sat, 22 Jul	50.1Moderate	38–68	10.1	192 / 192
Sun, 23 Jul	47Good	28–70	9.2	192 / 192
Mon, 24 Jul	47Good	24–68	11	192 / 192
Tue, 25 Jul	51.6Moderate	18–84	11.1	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	42	41	41	41	40	40	40	39	39	39	39	38	39	39	38	38	38	39	39	39	39	38	38	38
Thu	39	39	39	40	40	40	40	41	41	41	42	42	42	43	43	44	44	44	44	45	45	45	45	46
Fri	47	47	48	48	49	49	49	50	50	50	50	50	51	51	51	51	51	51	51	51	51	51	51	51
Sat	51	51	50	50	49	49	49	49	49	49	50	50	50	50	50	51	51	51	51	51	51	51	50	50
Sun	50	50	49	49	49	49	48	48	48	48	47	47	47	47	46	46	46	46	46	46	46	45	45	45
Mon	45	45	45	45	45	45	45	46	46	46	46	47	47	47	47	48	48	49	49	49	49	49	50	50
Tue	51	51	51	52	52	52	52	52	53	53	53	52	52	52	52	52	51	51	51	51	51	51	51	51

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
Chiang Mai	58.2Moderate	66	13.7	168 / 168
Phuket	54.8Moderate	58	11.5	168 / 168
Nakhon Ratchasima	51.4Moderate	84	12.2	168 / 168
Chiang Rai	49.1Good	62	10	168 / 168
Bangkok	48.8Good	70	10.9	168 / 168
Khon Kaen	45.3Good	58	8.6	168 / 168
Hat Yai	37Good	51	6.9	168 / 168
Pattaya	29.2Good	51	5	168 / 168

City-hours by category

Good: 682

Moderate: 662

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	42	41	41	41	40	40	40	39	39	39	39	38	39	39	38	38	38	39	39	39	39	38	38	38
Thu	39	39	39	40	40	40	40	41	41	41	42	42	42	43	43	44	44	44	44	45	45	45	45	46
Fri	47	47	48	48	49	49	49	50	50	50	50	50	51	51	51	51	51	51	51	51	51	51	51	51
Sat	51	51	50	50	49	49	49	49	49	49	50	50	50	50	50	51	51	51	51	51	51	51	50	50
Sun	50	50	49	49	49	49	48	48	48	48	47	47	47	47	46	46	46	46	46	46	46	45	45	45
Mon	45	45	45	45	45	45	45	46	46	46	46	47	47	47	47	48	48	49	49	49	49	49	50	50
Tue	51	51	51	52	52	52	52	52	53	53	53	52	52	52	52	52	51	51	51	51	51	51	51	51

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	42	41	41	41	40	40	40	39	39	39	39	38	39	39	38	38	38	39	39	39	39	38	38	38
Thu	39	39	39	40	40	40	40	41	41	41	42	42	42	43	43	44	44	44	44	45	45	45	45	46
Fri	47	47	48	48	49	49	49	50	50	50	50	50	51	51	51	51	51	51	51	51	51	51	51	51
Sat	51	51	50	50	49	49	49	49	49	49	50	50	50	50	50	51	51	51	51	51	51	51	50	50
Sun	50	50	49	49	49	49	48	48	48	48	47	47	47	47	46	46	46	46	46	46	46	45	45	45
Mon	45	45	45	45	45	45	45	46	46	46	46	47	47	47	47	48	48	49	49	49	49	49	50	50
Tue	51	51	51	52	52	52	52	52	53	53	53	52	52	52	52	52	51	51	51	51	51	51	51	51

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	42	41	41	41	40	40	40	39	39	39	39	38	39	39	38	38	38	39	39	39	39	38	38	38
Thu	39	39	39	40	40	40	40	41	41	41	42	42	42	43	43	44	44	44	44	45	45	45	45	46
Fri	47	47	48	48	49	49	49	50	50	50	50	50	51	51	51	51	51	51	51	51	51	51	51	51
Sat	51	51	50	50	49	49	49	49	49	49	50	50	50	50	50	51	51	51	51	51	51	51	50	50
Sun	50	50	49	49	49	49	48	48	48	48	47	47	47	47	46	46	46	46	46	46	46	45	45	45
Mon	45	45	45	45	45	45	45	46	46	46	46	47	47	47	47	48	48	49	49	49	49	49	50	50
Tue	51	51	51	52	52	52	52	52	53	53	53	52	52	52	52	52	51	51	51	51	51	51	51	51