21 – 27 Sep 2022 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

58.4Weekly mean modelled AQI · Moderate

Mean PM2.5: 13.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+6.4 AQI compared with the previous week’s mean of 52.

Highest hourly estimate: 271 in Bangkok · 23 Sept, 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 Sep	57.1Moderate	36–184	14.4	192 / 192
Thu, 22 Sep	69Moderate	31–201	17.5	192 / 192
Fri, 23 Sep	62Moderate	23–271	12.7	192 / 192
Sat, 24 Sep	57.7Moderate	23–243	11.8	192 / 192
Sun, 25 Sep	51.8Moderate	24–97	11.1	192 / 192
Mon, 26 Sep	52.7Moderate	34–85	12.6	192 / 192
Tue, 27 Sep	58.7Moderate	29–188	13.6	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	52	52	52	52	52	52	52	51	51	51	51	51	51	51	53	58	63	67	71	73	74	72	67
Thu	66	66	66	65	65	65	66	68	69	69	69	69	70	70	70	70	70	72	76	77	75	73	69	66
Fri	64	63	61	60	59	57	56	55	54	54	54	54	54	57	61	65	66	70	73	75	73	71	68	64
Sat	59	52	52	52	52	52	52	52	52	52	52	52	52	57	58	59	64	67	69	70	69	67	65	58
Sun	52	52	53	53	53	53	53	53	53	53	52	52	52	52	52	51	51	51	50	50	51	51	51	51
Mon	51	51	51	52	52	52	52	53	53	53	53	53	53	53	53	53	53	53	54	54	54	54	54	53
Tue	54	54	54	54	54	55	55	56	56	56	56	56	56	56	57	63	67	69	70	68	66	63	58	57

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	119Unhealthy for Sensitive Groups	271	33.3	168 / 168
Chiang Mai	60.7Moderate	76	15.1	168 / 168
Nakhon Ratchasima	58.3Moderate	81	13.5	168 / 168
Khon Kaen	51.9Moderate	61	10.6	168 / 168
Pattaya	46.5Good	140	9.9	168 / 168
Phuket	45.8Good	52	8.5	168 / 168
Chiang Rai	45.6Good	60	8.7	168 / 168
Hat Yai	39.6Good	54	7.4	168 / 168

City-hours by category

Good: 554

Moderate: 700

Unhealthy for Sensitive Groups: 48

Unhealthy: 26

Very Unhealthy: 16

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	52	52	52	52	52	52	52	51	51	51	51	51	51	51	53	58	63	67	71	73	74	72	67
Thu	66	66	66	65	65	65	66	68	69	69	69	69	70	70	70	70	70	72	76	77	75	73	69	66
Fri	64	63	61	60	59	57	56	55	54	54	54	54	54	57	61	65	66	70	73	75	73	71	68	64
Sat	59	52	52	52	52	52	52	52	52	52	52	52	52	57	58	59	64	67	69	70	69	67	65	58
Sun	52	52	53	53	53	53	53	53	53	53	52	52	52	52	52	51	51	51	50	50	51	51	51	51
Mon	51	51	51	52	52	52	52	53	53	53	53	53	53	53	53	53	53	53	54	54	54	54	54	53
Tue	54	54	54	54	54	55	55	56	56	56	56	56	56	56	57	63	67	69	70	68	66	63	58	57

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	52	52	52	52	52	52	52	51	51	51	51	51	51	51	53	58	63	67	71	73	74	72	67
Thu	66	66	66	65	65	65	66	68	69	69	69	69	70	70	70	70	70	72	76	77	75	73	69	66
Fri	64	63	61	60	59	57	56	55	54	54	54	54	54	57	61	65	66	70	73	75	73	71	68	64
Sat	59	52	52	52	52	52	52	52	52	52	52	52	52	57	58	59	64	67	69	70	69	67	65	58
Sun	52	52	53	53	53	53	53	53	53	53	52	52	52	52	52	51	51	51	50	50	51	51	51	51
Mon	51	51	51	52	52	52	52	53	53	53	53	53	53	53	53	53	53	53	54	54	54	54	54	53
Tue	54	54	54	54	54	55	55	56	56	56	56	56	56	56	57	63	67	69	70	68	66	63	58	57

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	52	52	52	52	52	52	52	51	51	51	51	51	51	51	53	58	63	67	71	73	74	72	67
Thu	66	66	66	65	65	65	66	68	69	69	69	69	70	70	70	70	70	72	76	77	75	73	69	66
Fri	64	63	61	60	59	57	56	55	54	54	54	54	54	57	61	65	66	70	73	75	73	71	68	64
Sat	59	52	52	52	52	52	52	52	52	52	52	52	52	57	58	59	64	67	69	70	69	67	65	58
Sun	52	52	53	53	53	53	53	53	53	53	52	52	52	52	52	51	51	51	50	50	51	51	51	51
Mon	51	51	51	52	52	52	52	53	53	53	53	53	53	53	53	53	53	53	54	54	54	54	54	53
Tue	54	54	54	54	54	55	55	56	56	56	56	56	56	56	57	63	67	69	70	68	66	63	58	57