14 – 20 Sep 2022 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

52Weekly mean modelled AQI · Moderate

Mean PM2.5: 11.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-12 AQI compared with the previous week’s mean of 64.

Highest hourly estimate: 165 in Bangkok · 14 Sept, 02:00 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, 14 Sep	67.8Moderate	35–165	14.5	192 / 192
Thu, 15 Sep	52.4Moderate	18–105	11.5	192 / 192
Fri, 16 Sep	50.6Moderate	20–94	10.4	192 / 192
Sat, 17 Sep	47.4Good	23–66	10.5	192 / 192
Sun, 18 Sep	48.3Good	24–68	10	192 / 192
Mon, 19 Sep	47.5Good	22–65	10	192 / 192
Tue, 20 Sep	50.4Moderate	27–85	11	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	74	74	73	73	73	72	72	72	71	70	69	69	68	68	68	68	68	66	63	60	60	59	59	58
Thu	58	57	56	55	54	53	53	52	52	51	51	51	51	50	50	50	50	50	50	51	52	53	54	55
Fri	55	55	54	53	51	51	51	51	51	50	50	50	50	50	50	50	50	49	50	50	49	49	49	48
Sat	48	48	48	47	47	47	47	47	47	47	47	47	47	47	47	47	48	48	48	48	48	48	48	48
Sun	48	48	48	48	49	49	49	49	49	49	49	49	49	49	49	48	48	48	48	48	47	47	47	47
Mon	47	46	46	46	46	46	47	47	47	47	48	48	48	48	48	48	48	48	48	48	48	49	49	49
Tue	49	49	49	49	49	50	50	50	50	50	50	50	50	51	51	51	51	52	53	51	51	51	52	52

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	74.3Moderate	165	18.8	168 / 168
Nakhon Ratchasima	63.5Moderate	109	14.2	168 / 168
Chiang Mai	61Moderate	69	14.5	168 / 168
Khon Kaen	58.9Moderate	68	13.3	168 / 168
Phuket	47.1Good	53	8.7	168 / 168
Chiang Rai	42.2Good	51	7.5	168 / 168
Hat Yai	39.3Good	51	6.9	168 / 168
Pattaya	30.2Good	69	5.1	168 / 168

City-hours by category

Good: 628

Moderate: 688

Unhealthy for Sensitive Groups: 16

Unhealthy: 12

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	74	74	73	73	73	72	72	72	71	70	69	69	68	68	68	68	68	66	63	60	60	59	59	58
Thu	58	57	56	55	54	53	53	52	52	51	51	51	51	50	50	50	50	50	50	51	52	53	54	55
Fri	55	55	54	53	51	51	51	51	51	50	50	50	50	50	50	50	50	49	50	50	49	49	49	48
Sat	48	48	48	47	47	47	47	47	47	47	47	47	47	47	47	47	48	48	48	48	48	48	48	48
Sun	48	48	48	48	49	49	49	49	49	49	49	49	49	49	49	48	48	48	48	48	47	47	47	47
Mon	47	46	46	46	46	46	47	47	47	47	48	48	48	48	48	48	48	48	48	48	48	49	49	49
Tue	49	49	49	49	49	50	50	50	50	50	50	50	50	51	51	51	51	52	53	51	51	51	52	52

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	74	74	73	73	73	72	72	72	71	70	69	69	68	68	68	68	68	66	63	60	60	59	59	58
Thu	58	57	56	55	54	53	53	52	52	51	51	51	51	50	50	50	50	50	50	51	52	53	54	55
Fri	55	55	54	53	51	51	51	51	51	50	50	50	50	50	50	50	50	49	50	50	49	49	49	48
Sat	48	48	48	47	47	47	47	47	47	47	47	47	47	47	47	47	48	48	48	48	48	48	48	48
Sun	48	48	48	48	49	49	49	49	49	49	49	49	49	49	49	48	48	48	48	48	47	47	47	47
Mon	47	46	46	46	46	46	47	47	47	47	48	48	48	48	48	48	48	48	48	48	48	49	49	49
Tue	49	49	49	49	49	50	50	50	50	50	50	50	50	51	51	51	51	52	53	51	51	51	52	52

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	74	74	73	73	73	72	72	72	71	70	69	69	68	68	68	68	68	66	63	60	60	59	59	58
Thu	58	57	56	55	54	53	53	52	52	51	51	51	51	50	50	50	50	50	50	51	52	53	54	55
Fri	55	55	54	53	51	51	51	51	51	50	50	50	50	50	50	50	50	49	50	50	49	49	49	48
Sat	48	48	48	47	47	47	47	47	47	47	47	47	47	47	47	47	48	48	48	48	48	48	48	48
Sun	48	48	48	48	49	49	49	49	49	49	49	49	49	49	49	48	48	48	48	48	47	47	47	47
Mon	47	46	46	46	46	46	47	47	47	47	48	48	48	48	48	48	48	48	48	48	48	49	49	49
Tue	49	49	49	49	49	50	50	50	50	50	50	50	50	51	51	51	51	52	53	51	51	51	52	52