11 – 17 Oct 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

64.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 16 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+14.6 AQI compared with the previous week’s mean of 49.7.

Highest hourly estimate: 226 in Bangkok · 15 Oct, 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, 11 Oct	59Moderate	22–124	11	192 / 192
Thu, 12 Oct	52.7Moderate	29–116	12.6	192 / 192
Fri, 13 Oct	64.1Moderate	33–209	17	192 / 192
Sat, 14 Oct	67.8Moderate	31–223	17.3	192 / 192
Sun, 15 Oct	71.7Moderate	24–226	18.4	192 / 192
Mon, 16 Oct	67.6Moderate	19–189	16.9	192 / 192
Tue, 17 Oct	67.2Moderate	18–206	19.2	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	64	64	64	64	64	64	63	63	62	62	61	61	60	59	58	58	57	56	55	53	53	52	51	51
Thu	51	50	50	50	50	50	50	50	50	51	51	51	52	52	52	53	54	57	59	59	59	57	54	55
Fri	55	55	56	56	56	57	57	57	57	57	57	56	56	56	57	60	66	76	83	85	85	84	81	76
Sat	70	66	63	63	63	63	63	63	63	62	62	62	62	62	62	64	66	73	81	83	82	80	77	74
Sun	73	70	67	62	63	63	63	63	63	63	63	63	64	65	67	70	76	86	90	91	88	87	84	80
Mon	73	66	65	65	65	66	66	66	66	66	66	66	66	65	65	64	64	70	74	76	75	73	70	66
Tue	61	61	61	61	61	61	62	62	62	62	62	63	63	64	64	67	75	84	87	84	78	73	69	66

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	121.8Unhealthy for Sensitive Groups	226	37.5	168 / 168
Pattaya	103.8Unhealthy for Sensitive Groups	223	28.9	168 / 168
Khon Kaen	63.1Moderate	113	15.5	168 / 168
Chiang Mai	58.4Moderate	72	14	168 / 168
Nakhon Ratchasima	52.4Moderate	81	11.6	168 / 168
Chiang Rai	42.9Good	55	8	168 / 168
Hat Yai	42.9Good	65	7.7	168 / 168
Phuket	29.2Good	44	5.2	168 / 168

City-hours by category

Good: 513

Moderate: 635

Unhealthy for Sensitive Groups: 140

Unhealthy: 32

Very Unhealthy: 24

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	64	64	64	64	64	64	63	63	62	62	61	61	60	59	58	58	57	56	55	53	53	52	51	51
Thu	51	50	50	50	50	50	50	50	50	51	51	51	52	52	52	53	54	57	59	59	59	57	54	55
Fri	55	55	56	56	56	57	57	57	57	57	57	56	56	56	57	60	66	76	83	85	85	84	81	76
Sat	70	66	63	63	63	63	63	63	63	62	62	62	62	62	62	64	66	73	81	83	82	80	77	74
Sun	73	70	67	62	63	63	63	63	63	63	63	63	64	65	67	70	76	86	90	91	88	87	84	80
Mon	73	66	65	65	65	66	66	66	66	66	66	66	66	65	65	64	64	70	74	76	75	73	70	66
Tue	61	61	61	61	61	61	62	62	62	62	62	63	63	64	64	67	75	84	87	84	78	73	69	66

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	64	64	64	64	64	64	63	63	62	62	61	61	60	59	58	58	57	56	55	53	53	52	51	51
Thu	51	50	50	50	50	50	50	50	50	51	51	51	52	52	52	53	54	57	59	59	59	57	54	55
Fri	55	55	56	56	56	57	57	57	57	57	57	56	56	56	57	60	66	76	83	85	85	84	81	76
Sat	70	66	63	63	63	63	63	63	63	62	62	62	62	62	62	64	66	73	81	83	82	80	77	74
Sun	73	70	67	62	63	63	63	63	63	63	63	63	64	65	67	70	76	86	90	91	88	87	84	80
Mon	73	66	65	65	65	66	66	66	66	66	66	66	66	65	65	64	64	70	74	76	75	73	70	66
Tue	61	61	61	61	61	61	62	62	62	62	62	63	63	64	64	67	75	84	87	84	78	73	69	66

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	64	64	64	64	64	64	63	63	62	62	61	61	60	59	58	58	57	56	55	53	53	52	51	51
Thu	51	50	50	50	50	50	50	50	50	51	51	51	52	52	52	53	54	57	59	59	59	57	54	55
Fri	55	55	56	56	56	57	57	57	57	57	57	56	56	56	57	60	66	76	83	85	85	84	81	76
Sat	70	66	63	63	63	63	63	63	63	62	62	62	62	62	62	64	66	73	81	83	82	80	77	74
Sun	73	70	67	62	63	63	63	63	63	63	63	63	64	65	67	70	76	86	90	91	88	87	84	80
Mon	73	66	65	65	65	66	66	66	66	66	66	66	66	65	65	64	64	70	74	76	75	73	70	66
Tue	61	61	61	61	61	61	62	62	62	62	62	63	63	64	64	67	75	84	87	84	78	73	69	66