18 – 24 Oct 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

74.2Weekly mean modelled AQI · Moderate

Mean PM2.5: 20.7 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+9.9 AQI compared with the previous week’s mean of 64.3.

Highest hourly estimate: 269 in Bangkok · 18 Oct, 20:00 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, 18 Oct	79.9Moderate	26–269	27.7	192 / 192
Thu, 19 Oct	83.5Moderate	27–240	22.9	192 / 192
Fri, 20 Oct	83.3Moderate	26–268	27.5	192 / 192
Sat, 21 Oct	76.2Moderate	25–236	15.3	192 / 192
Sun, 22 Oct	56.3Moderate	23–114	13.1	192 / 192
Mon, 23 Oct	65.6Moderate	23–219	17.7	192 / 192
Tue, 24 Oct	74.9Moderate	22–265	20.7	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	68	69	70	70	71	71	72	73	73	73	74	74	76	81	89	99	103	101	97	96	94	90
Thu	87	85	84	82	80	79	79	79	80	80	79	79	79	79	79	80	86	92	94	93	91	89	86	82
Fri	78	75	75	74	74	74	74	73	73	73	73	74	74	75	81	89	92	97	100	101	102	102	100	97
Sat	92	88	86	84	82	82	82	81	80	79	78	77	76	75	74	73	72	71	70	68	67	66	64	62
Sun	60	59	57	56	55	54	54	53	53	53	54	54	54	55	56	56	57	59	62	61	60	58	56	56
Mon	56	56	56	55	55	55	55	55	56	56	56	57	57	57	59	67	78	88	92	89	86	83	79	74
Tue	67	66	67	67	68	68	69	69	69	69	69	69	69	70	73	75	79	90	95	95	90	86	80	77

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	163.2Unhealthy	269	61.2	168 / 168
Pattaya	93.2Moderate	171	25.1	168 / 168
Chiang Mai	73.8Moderate	121	21.2	168 / 168
Khon Kaen	71.6Moderate	93	19	168 / 168
Nakhon Ratchasima	63.5Moderate	92	15.1	168 / 168
Chiang Rai	52.2Moderate	56	10.2	168 / 168
Hat Yai	42.2Good	56	7.8	168 / 168
Phuket	34.2Good	53	6.1	168 / 168

City-hours by category

Good: 363

Moderate: 781

Unhealthy for Sensitive Groups: 85

Unhealthy: 70

Very Unhealthy: 45

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	68	69	70	70	71	71	72	73	73	73	74	74	76	81	89	99	103	101	97	96	94	90
Thu	87	85	84	82	80	79	79	79	80	80	79	79	79	79	79	80	86	92	94	93	91	89	86	82
Fri	78	75	75	74	74	74	74	73	73	73	73	74	74	75	81	89	92	97	100	101	102	102	100	97
Sat	92	88	86	84	82	82	82	81	80	79	78	77	76	75	74	73	72	71	70	68	67	66	64	62
Sun	60	59	57	56	55	54	54	53	53	53	54	54	54	55	56	56	57	59	62	61	60	58	56	56
Mon	56	56	56	55	55	55	55	55	56	56	56	57	57	57	59	67	78	88	92	89	86	83	79	74
Tue	67	66	67	67	68	68	69	69	69	69	69	69	69	70	73	75	79	90	95	95	90	86	80	77

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	68	69	70	70	71	71	72	73	73	73	74	74	76	81	89	99	103	101	97	96	94	90
Thu	87	85	84	82	80	79	79	79	80	80	79	79	79	79	79	80	86	92	94	93	91	89	86	82
Fri	78	75	75	74	74	74	74	73	73	73	73	74	74	75	81	89	92	97	100	101	102	102	100	97
Sat	92	88	86	84	82	82	82	81	80	79	78	77	76	75	74	73	72	71	70	68	67	66	64	62
Sun	60	59	57	56	55	54	54	53	53	53	54	54	54	55	56	56	57	59	62	61	60	58	56	56
Mon	56	56	56	55	55	55	55	55	56	56	56	57	57	57	59	67	78	88	92	89	86	83	79	74
Tue	67	66	67	67	68	68	69	69	69	69	69	69	69	70	73	75	79	90	95	95	90	86	80	77

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	68	69	70	70	71	71	72	73	73	73	74	74	76	81	89	99	103	101	97	96	94	90
Thu	87	85	84	82	80	79	79	79	80	80	79	79	79	79	79	80	86	92	94	93	91	89	86	82
Fri	78	75	75	74	74	74	74	73	73	73	73	74	74	75	81	89	92	97	100	101	102	102	100	97
Sat	92	88	86	84	82	82	82	81	80	79	78	77	76	75	74	73	72	71	70	68	67	66	64	62
Sun	60	59	57	56	55	54	54	53	53	53	54	54	54	55	56	56	57	59	62	61	60	58	56	56
Mon	56	56	56	55	55	55	55	55	56	56	56	57	57	57	59	67	78	88	92	89	86	83	79	74
Tue	67	66	67	67	68	68	69	69	69	69	69	69	69	70	73	75	79	90	95	95	90	86	80	77