22 – 28 Nov 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

58.8Weekly mean modelled AQI · Moderate

Mean PM2.5: 14.2 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+6 AQI compared with the previous week’s mean of 52.8.

Highest hourly estimate: 145 in Bangkok · 22 Nov, 18:00 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, 22 Nov	70.3Moderate	51–145	19.6	192 / 192
Thu, 23 Nov	69.8Moderate	45–123	17	192 / 192
Fri, 24 Nov	57.7Moderate	32–111	11.5	192 / 192
Sat, 25 Nov	51.5Moderate	29–98	13.3	192 / 192
Sun, 26 Nov	58.8Moderate	36–107	13.4	192 / 192
Mon, 27 Nov	51.2Moderate	26–90	9.9	192 / 192
Tue, 28 Nov	52.5Moderate	23–104	14.3	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	67	67	67	67	67	68	68	68	68	68	68	69	69	69	69	69	74	80	83	79	73	71	70	71
Thu	71	71	71	71	71	71	71	71	71	70	70	70	69	69	69	68	70	71	72	71	69	66	66	66
Fri	65	64	64	63	63	62	61	60	59	58	57	57	56	56	55	55	55	55	55	55	54	53	51	50
Sat	49	48	48	48	48	48	48	48	49	49	49	50	50	51	52	53	54	56	58	58	57	56	56	56
Sun	57	57	58	58	58	58	59	59	59	60	60	60	60	60	60	59	59	60	61	61	58	58	58	57
Mon	57	57	56	55	55	54	53	53	52	51	50	49	49	49	49	49	50	51	51	50	49	48	48	47
Tue	46	46	46	47	47	48	48	49	49	49	50	51	51	52	53	54	56	61	63	62	60	57	58	58

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	92.1Moderate	145	29	168 / 168
Chiang Mai	76.8Moderate	121	22.5	168 / 168
Chiang Rai	56.5Moderate	61	12.7	168 / 168
Khon Kaen	54.2Moderate	76	11.7	168 / 168
Pattaya	53.8Moderate	98	11	168 / 168
Nakhon Ratchasima	51.1Moderate	79	10.7	168 / 168
Hat Yai	45.3Good	57	8.4	168 / 168
Phuket	41Good	69	7.2	168 / 168

City-hours by category

Good: 409

Moderate: 870

Unhealthy for Sensitive Groups: 65

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	67	67	67	67	67	68	68	68	68	68	68	69	69	69	69	69	74	80	83	79	73	71	70	71
Thu	71	71	71	71	71	71	71	71	71	70	70	70	69	69	69	68	70	71	72	71	69	66	66	66
Fri	65	64	64	63	63	62	61	60	59	58	57	57	56	56	55	55	55	55	55	55	54	53	51	50
Sat	49	48	48	48	48	48	48	48	49	49	49	50	50	51	52	53	54	56	58	58	57	56	56	56
Sun	57	57	58	58	58	58	59	59	59	60	60	60	60	60	60	59	59	60	61	61	58	58	58	57
Mon	57	57	56	55	55	54	53	53	52	51	50	49	49	49	49	49	50	51	51	50	49	48	48	47
Tue	46	46	46	47	47	48	48	49	49	49	50	51	51	52	53	54	56	61	63	62	60	57	58	58

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	67	67	67	67	67	68	68	68	68	68	68	69	69	69	69	69	74	80	83	79	73	71	70	71
Thu	71	71	71	71	71	71	71	71	71	70	70	70	69	69	69	68	70	71	72	71	69	66	66	66
Fri	65	64	64	63	63	62	61	60	59	58	57	57	56	56	55	55	55	55	55	55	54	53	51	50
Sat	49	48	48	48	48	48	48	48	49	49	49	50	50	51	52	53	54	56	58	58	57	56	56	56
Sun	57	57	58	58	58	58	59	59	59	60	60	60	60	60	60	59	59	60	61	61	58	58	58	57
Mon	57	57	56	55	55	54	53	53	52	51	50	49	49	49	49	49	50	51	51	50	49	48	48	47
Tue	46	46	46	47	47	48	48	49	49	49	50	51	51	52	53	54	56	61	63	62	60	57	58	58

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	67	67	67	67	67	68	68	68	68	68	68	69	69	69	69	69	74	80	83	79	73	71	70	71
Thu	71	71	71	71	71	71	71	71	71	70	70	70	69	69	69	68	70	71	72	71	69	66	66	66
Fri	65	64	64	63	63	62	61	60	59	58	57	57	56	56	55	55	55	55	55	55	54	53	51	50
Sat	49	48	48	48	48	48	48	48	49	49	49	50	50	51	52	53	54	56	58	58	57	56	56	56
Sun	57	57	58	58	58	58	59	59	59	60	60	60	60	60	60	59	59	60	61	61	58	58	58	57
Mon	57	57	56	55	55	54	53	53	52	51	50	49	49	49	49	49	50	51	51	50	49	48	48	47
Tue	46	46	46	47	47	48	48	49	49	49	50	51	51	52	53	54	56	61	63	62	60	57	58	58