21 – 27 Jun 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

57.8Weekly mean modelled AQI · Moderate

Mean PM2.5: 12.5 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+7.9 AQI compared with the previous week’s mean of 49.9.

Highest hourly estimate: 252 in Bangkok · 27 Jun, 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, 21 Jun	59.1Moderate	35–201	12.7	192 / 192
Thu, 22 Jun	60.9Moderate	35–208	12.8	192 / 192
Fri, 23 Jun	57.8Moderate	34–209	14.1	192 / 192
Sat, 24 Jun	57.3Moderate	28–163	11.5	192 / 192
Sun, 25 Jun	53.8Moderate	28–165	12.3	192 / 192
Mon, 26 Jun	56.2Moderate	33–159	12	192 / 192
Tue, 27 Jun	59.7Moderate	35–252	12.1	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	54	55	55	55	56	55	55	54	54	54	55	55	55	55	55	59	62	61	67	69	70	71	71	68
Thu	64	60	61	61	61	61	60	59	57	56	56	56	55	56	57	59	62	67	69	69	69	68	64	59
Fri	54	54	53	53	53	53	52	52	52	52	52	53	53	53	54	57	62	65	67	68	70	70	70	68
Sat	64	60	58	58	58	58	57	57	57	57	57	57	56	56	55	55	54	57	60	61	61	59	56	51
Sun	51	51	51	51	51	51	51	51	50	51	51	51	51	52	52	52	52	56	60	63	64	63	61	56
Mon	54	55	55	55	55	56	56	56	55	55	56	55	55	55	55	55	55	59	62	62	61	59	54	54
Tue	54	53	53	53	53	53	53	53	53	53	54	54	53	55	61	66	68	69	71	73	72	71	69	67

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	116.2Unhealthy for Sensitive Groups	252	31	168 / 168
Nakhon Ratchasima	61.5Moderate	103	13.8	168 / 168
Hat Yai	54.5Moderate	68	11.5	168 / 168
Chiang Mai	54Moderate	57	11.4	168 / 168
Khon Kaen	51.7Moderate	62	10	168 / 168
Chiang Rai	45.2Good	54	8.2	168 / 168
Phuket	41.4Good	49	7.4	168 / 168
Pattaya	38Good	50	6.8	168 / 168

City-hours by category

Good: 572

Moderate: 688

Unhealthy for Sensitive Groups: 47

Unhealthy: 22

Very Unhealthy: 15

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	55	55	55	56	55	55	54	54	54	55	55	55	55	55	59	62	61	67	69	70	71	71	68
Thu	64	60	61	61	61	61	60	59	57	56	56	56	55	56	57	59	62	67	69	69	69	68	64	59
Fri	54	54	53	53	53	53	52	52	52	52	52	53	53	53	54	57	62	65	67	68	70	70	70	68
Sat	64	60	58	58	58	58	57	57	57	57	57	57	56	56	55	55	54	57	60	61	61	59	56	51
Sun	51	51	51	51	51	51	51	51	50	51	51	51	51	52	52	52	52	56	60	63	64	63	61	56
Mon	54	55	55	55	55	56	56	56	55	55	56	55	55	55	55	55	55	59	62	62	61	59	54	54
Tue	54	53	53	53	53	53	53	53	53	53	54	54	53	55	61	66	68	69	71	73	72	71	69	67

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	55	55	55	56	55	55	54	54	54	55	55	55	55	55	59	62	61	67	69	70	71	71	68
Thu	64	60	61	61	61	61	60	59	57	56	56	56	55	56	57	59	62	67	69	69	69	68	64	59
Fri	54	54	53	53	53	53	52	52	52	52	52	53	53	53	54	57	62	65	67	68	70	70	70	68
Sat	64	60	58	58	58	58	57	57	57	57	57	57	56	56	55	55	54	57	60	61	61	59	56	51
Sun	51	51	51	51	51	51	51	51	50	51	51	51	51	52	52	52	52	56	60	63	64	63	61	56
Mon	54	55	55	55	55	56	56	56	55	55	56	55	55	55	55	55	55	59	62	62	61	59	54	54
Tue	54	53	53	53	53	53	53	53	53	53	54	54	53	55	61	66	68	69	71	73	72	71	69	67

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	55	55	55	56	55	55	54	54	54	55	55	55	55	55	59	62	61	67	69	70	71	71	68
Thu	64	60	61	61	61	61	60	59	57	56	56	56	55	56	57	59	62	67	69	69	69	68	64	59
Fri	54	54	53	53	53	53	52	52	52	52	52	53	53	53	54	57	62	65	67	68	70	70	70	68
Sat	64	60	58	58	58	58	57	57	57	57	57	57	56	56	55	55	54	57	60	61	61	59	56	51
Sun	51	51	51	51	51	51	51	51	50	51	51	51	51	52	52	52	52	56	60	63	64	63	61	56
Mon	54	55	55	55	55	56	56	56	55	55	56	55	55	55	55	55	55	59	62	62	61	59	54	54
Tue	54	53	53	53	53	53	53	53	53	53	54	54	53	55	61	66	68	69	71	73	72	71	69	67