15 – 21 Nov 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

52.8Weekly mean modelled AQI · Moderate

Mean PM2.5: 12.4 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 58.8.

Highest hourly estimate: 140 in Bangkok · 21 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, 15 Nov	45.2Good	27–139	10.5	192 / 192
Thu, 16 Nov	48.5Good	24–101	10	192 / 192
Fri, 17 Nov	44.5Good	27–86	8.8	192 / 192
Sat, 18 Nov	49.4Good	28–109	11.5	192 / 192
Sun, 19 Nov	54.2Moderate	30–91	12.6	192 / 192
Mon, 20 Nov	60.6Moderate	36–139	15.7	192 / 192
Tue, 21 Nov	66.9Moderate	51–140	17.9	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	42	41	41	40	40	40	40	41	42	42	43	43	44	44	45	46	49	54	57	56	53	49	47	47
Thu	46	46	45	46	46	46	46	46	46	46	47	47	47	48	49	50	51	55	57	56	53	51	49	48
Fri	46	45	44	44	44	43	43	42	42	42	42	42	43	44	44	45	45	47	48	49	48	46	45	45
Sat	45	45	45	45	45	45	45	45	46	46	46	47	48	49	49	50	52	57	61	60	57	54	53	53
Sun	52	52	53	53	53	53	53	53	54	54	54	54	55	55	55	55	55	56	57	57	55	55	55	55
Mon	56	56	56	56	57	57	57	58	58	58	58	59	59	59	60	60	63	69	72	71	68	64	62	62
Tue	63	63	63	64	64	64	64	64	64	65	65	65	66	67	68	68	71	77	78	75	71	67	66	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	82.6Moderate	140	24.9	168 / 168
Chiang Mai	66.9Moderate	82	18.8	168 / 168
Khon Kaen	53.6Moderate	79	12	168 / 168
Nakhon Ratchasima	47.1Good	59	9.6	168 / 168
Pattaya	47Good	87	9.3	168 / 168
Chiang Rai	43.1Good	57	8.6	168 / 168
Hat Yai	43.1Good	59	9.1	168 / 168
Phuket	38.6Good	77	7	168 / 168

City-hours by category

Good: 605

Moderate: 722

Unhealthy for Sensitive Groups: 17

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	42	41	41	40	40	40	40	41	42	42	43	43	44	44	45	46	49	54	57	56	53	49	47	47
Thu	46	46	45	46	46	46	46	46	46	46	47	47	47	48	49	50	51	55	57	56	53	51	49	48
Fri	46	45	44	44	44	43	43	42	42	42	42	42	43	44	44	45	45	47	48	49	48	46	45	45
Sat	45	45	45	45	45	45	45	45	46	46	46	47	48	49	49	50	52	57	61	60	57	54	53	53
Sun	52	52	53	53	53	53	53	53	54	54	54	54	55	55	55	55	55	56	57	57	55	55	55	55
Mon	56	56	56	56	57	57	57	58	58	58	58	59	59	59	60	60	63	69	72	71	68	64	62	62
Tue	63	63	63	64	64	64	64	64	64	65	65	65	66	67	68	68	71	77	78	75	71	67	66	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	42	41	41	40	40	40	40	41	42	42	43	43	44	44	45	46	49	54	57	56	53	49	47	47
Thu	46	46	45	46	46	46	46	46	46	46	47	47	47	48	49	50	51	55	57	56	53	51	49	48
Fri	46	45	44	44	44	43	43	42	42	42	42	42	43	44	44	45	45	47	48	49	48	46	45	45
Sat	45	45	45	45	45	45	45	45	46	46	46	47	48	49	49	50	52	57	61	60	57	54	53	53
Sun	52	52	53	53	53	53	53	53	54	54	54	54	55	55	55	55	55	56	57	57	55	55	55	55
Mon	56	56	56	56	57	57	57	58	58	58	58	59	59	59	60	60	63	69	72	71	68	64	62	62
Tue	63	63	63	64	64	64	64	64	64	65	65	65	66	67	68	68	71	77	78	75	71	67	66	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	42	41	41	40	40	40	40	41	42	42	43	43	44	44	45	46	49	54	57	56	53	49	47	47
Thu	46	46	45	46	46	46	46	46	46	46	47	47	47	48	49	50	51	55	57	56	53	51	49	48
Fri	46	45	44	44	44	43	43	42	42	42	42	42	43	44	44	45	45	47	48	49	48	46	45	45
Sat	45	45	45	45	45	45	45	45	46	46	46	47	48	49	49	50	52	57	61	60	57	54	53	53
Sun	52	52	53	53	53	53	53	53	54	54	54	54	55	55	55	55	55	56	57	57	55	55	55	55
Mon	56	56	56	56	57	57	57	58	58	58	58	59	59	59	60	60	63	69	72	71	68	64	62	62
Tue	63	63	63	64	64	64	64	64	64	65	65	65	66	67	68	68	71	77	78	75	71	67	66	67