31 Aug – 6 Sep 2022 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

61.8Weekly mean modelled AQI · Moderate

Mean PM2.5: 14.8 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+4.7 AQI compared with the previous week’s mean of 57.1.

Highest hourly estimate: 297 in Bangkok · 2 Sept, 16:00 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, 31 Aug	64.6Moderate	28–203	15	192 / 192
Thu, 1 Sep	63.3Moderate	31–178	16	192 / 192
Fri, 2 Sep	67.8Moderate	30–297	18.6	192 / 192
Sat, 3 Sep	74.2Moderate	27–232	17.7	192 / 192
Sun, 4 Sep	57.5Moderate	25–123	12.8	192 / 192
Mon, 5 Sep	52.2Moderate	20–81	11.5	192 / 192
Tue, 6 Sep	52.9Moderate	18–125	12	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	72	67	67	67	67	66	66	65	66	66	66	66	65	65	64	64	64	63	63	62	62	61	61	60
Thu	59	59	58	58	58	57	58	58	57	57	57	58	58	58	59	60	68	77	81	80	77	74	70	66
Fri	61	60	60	60	60	60	60	60	60	61	67	72	74	75	76	80	84	73	69	68	66	65	82	78
Sat	75	71	66	66	66	66	67	67	67	67	68	71	75	78	81	83	85	87	86	82	81	80	76	71
Sun	66	63	62	61	61	60	59	58	58	57	57	56	56	56	55	55	55	56	56	55	54	54	54	54
Mon	54	53	53	53	53	53	53	53	53	52	52	52	52	52	52	52	52	52	52	51	51	51	51	51
Tue	51	51	51	51	51	51	52	52	52	52	52	53	53	53	52	52	53	57	59	59	56	53	53	53

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	113.2Unhealthy for Sensitive Groups	297	32.5	168 / 168
Nakhon Ratchasima	78Moderate	221	19.1	168 / 168
Chiang Mai	70.6Moderate	124	18.8	168 / 168
Khon Kaen	65.5Moderate	97	16.8	168 / 168
Chiang Rai	50.6Moderate	59	10.2	168 / 168
Hat Yai	42.8Good	56	7.9	168 / 168
Phuket	40.2Good	51	7.6	168 / 168
Pattaya	33.3Good	52	5.6	168 / 168

City-hours by category

Good: 529

Moderate: 714

Unhealthy for Sensitive Groups: 42

Unhealthy: 42

Very Unhealthy: 17

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	72	67	67	67	67	66	66	65	66	66	66	66	65	65	64	64	64	63	63	62	62	61	61	60
Thu	59	59	58	58	58	57	58	58	57	57	57	58	58	58	59	60	68	77	81	80	77	74	70	66
Fri	61	60	60	60	60	60	60	60	60	61	67	72	74	75	76	80	84	73	69	68	66	65	82	78
Sat	75	71	66	66	66	66	67	67	67	67	68	71	75	78	81	83	85	87	86	82	81	80	76	71
Sun	66	63	62	61	61	60	59	58	58	57	57	56	56	56	55	55	55	56	56	55	54	54	54	54
Mon	54	53	53	53	53	53	53	53	53	52	52	52	52	52	52	52	52	52	52	51	51	51	51	51
Tue	51	51	51	51	51	51	52	52	52	52	52	53	53	53	52	52	53	57	59	59	56	53	53	53

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	72	67	67	67	67	66	66	65	66	66	66	66	65	65	64	64	64	63	63	62	62	61	61	60
Thu	59	59	58	58	58	57	58	58	57	57	57	58	58	58	59	60	68	77	81	80	77	74	70	66
Fri	61	60	60	60	60	60	60	60	60	61	67	72	74	75	76	80	84	73	69	68	66	65	82	78
Sat	75	71	66	66	66	66	67	67	67	67	68	71	75	78	81	83	85	87	86	82	81	80	76	71
Sun	66	63	62	61	61	60	59	58	58	57	57	56	56	56	55	55	55	56	56	55	54	54	54	54
Mon	54	53	53	53	53	53	53	53	53	52	52	52	52	52	52	52	52	52	52	51	51	51	51	51
Tue	51	51	51	51	51	51	52	52	52	52	52	53	53	53	52	52	53	57	59	59	56	53	53	53

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	72	67	67	67	67	66	66	65	66	66	66	66	65	65	64	64	64	63	63	62	62	61	61	60
Thu	59	59	58	58	58	57	58	58	57	57	57	58	58	58	59	60	68	77	81	80	77	74	70	66
Fri	61	60	60	60	60	60	60	60	60	61	67	72	74	75	76	80	84	73	69	68	66	65	82	78
Sat	75	71	66	66	66	66	67	67	67	67	68	71	75	78	81	83	85	87	86	82	81	80	76	71
Sun	66	63	62	61	61	60	59	58	58	57	57	56	56	56	55	55	55	56	56	55	54	54	54	54
Mon	54	53	53	53	53	53	53	53	53	52	52	52	52	52	52	52	52	52	52	51	51	51	51	51
Tue	51	51	51	51	51	51	52	52	52	52	52	53	53	53	52	52	53	57	59	59	56	53	53	53