26 Oct – 1 Nov 2022 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

78.7Weekly mean modelled AQI · Moderate

Mean PM2.5: 21.4 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-5 AQI compared with the previous week’s mean of 83.7.

Highest hourly estimate: 291 in Bangkok · 28 Oct, 17:00 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, 26 Oct	87.9Moderate	22–264	21	192 / 192
Thu, 27 Oct	72.3Moderate	20–232	18.5	192 / 192
Fri, 28 Oct	77.5Moderate	36–291	19.8	192 / 192
Sat, 29 Oct	68.6Moderate	33–236	17.4	192 / 192
Sun, 30 Oct	77.7Moderate	36–250	25	192 / 192
Mon, 31 Oct	86.1Moderate	38–256	25.5	192 / 192
Tue, 1 Nov	80.8Moderate	37–239	22.5	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	111	103	99	93	92	91	91	90	89	88	87	86	85	83	81	84	87	90	90	86	81	78	74	71
Thu	70	70	69	69	69	69	69	69	69	69	70	70	70	71	71	76	79	81	81	81	79	76	71	68
Fri	67	67	67	68	68	68	68	68	68	69	74	76	76	76	79	87	95	100	101	99	92	84	75	69
Sat	69	68	67	67	66	66	66	66	65	65	65	65	65	65	66	72	74	77	78	77	75	73	66	65
Sun	65	65	66	66	67	68	68	69	70	71	72	73	75	77	81	87	92	98	100	96	93	88	79	79
Mon	80	81	81	81	81	82	82	82	82	82	82	83	83	84	88	92	97	100	101	98	94	90	81	80
Tue	80	79	79	79	79	78	78	78	77	77	77	77	77	76	76	78	85	90	93	91	89	86	83	76

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	180.7Unhealthy	291	59.6	168 / 168
Chiang Mai	85Moderate	124	26.5	168 / 168
Pattaya	81.5Moderate	264	17.4	168 / 168
Nakhon Ratchasima	65.7Moderate	88	17.1	168 / 168
Chiang Rai	64.8Moderate	78	16.2	168 / 168
Khon Kaen	63.8Moderate	98	16.9	168 / 168
Hat Yai	48Good	58	9.8	168 / 168
Phuket	40.1Good	95	7.6	168 / 168

City-hours by category

Good: 297

Moderate: 839

Unhealthy for Sensitive Groups: 55

Unhealthy: 99

Very Unhealthy: 54

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	111	103	99	93	92	91	91	90	89	88	87	86	85	83	81	84	87	90	90	86	81	78	74	71
Thu	70	70	69	69	69	69	69	69	69	69	70	70	70	71	71	76	79	81	81	81	79	76	71	68
Fri	67	67	67	68	68	68	68	68	68	69	74	76	76	76	79	87	95	100	101	99	92	84	75	69
Sat	69	68	67	67	66	66	66	66	65	65	65	65	65	65	66	72	74	77	78	77	75	73	66	65
Sun	65	65	66	66	67	68	68	69	70	71	72	73	75	77	81	87	92	98	100	96	93	88	79	79
Mon	80	81	81	81	81	82	82	82	82	82	82	83	83	84	88	92	97	100	101	98	94	90	81	80
Tue	80	79	79	79	79	78	78	78	77	77	77	77	77	76	76	78	85	90	93	91	89	86	83	76

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	111	103	99	93	92	91	91	90	89	88	87	86	85	83	81	84	87	90	90	86	81	78	74	71
Thu	70	70	69	69	69	69	69	69	69	69	70	70	70	71	71	76	79	81	81	81	79	76	71	68
Fri	67	67	67	68	68	68	68	68	68	69	74	76	76	76	79	87	95	100	101	99	92	84	75	69
Sat	69	68	67	67	66	66	66	66	65	65	65	65	65	65	66	72	74	77	78	77	75	73	66	65
Sun	65	65	66	66	67	68	68	69	70	71	72	73	75	77	81	87	92	98	100	96	93	88	79	79
Mon	80	81	81	81	81	82	82	82	82	82	82	83	83	84	88	92	97	100	101	98	94	90	81	80
Tue	80	79	79	79	79	78	78	78	77	77	77	77	77	76	76	78	85	90	93	91	89	86	83	76

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	111	103	99	93	92	91	91	90	89	88	87	86	85	83	81	84	87	90	90	86	81	78	74	71
Thu	70	70	69	69	69	69	69	69	69	69	70	70	70	71	71	76	79	81	81	81	79	76	71	68
Fri	67	67	67	68	68	68	68	68	68	69	74	76	76	76	79	87	95	100	101	99	92	84	75	69
Sat	69	68	67	67	66	66	66	66	65	65	65	65	65	65	66	72	74	77	78	77	75	73	66	65
Sun	65	65	66	66	67	68	68	69	70	71	72	73	75	77	81	87	92	98	100	96	93	88	79	79
Mon	80	81	81	81	81	82	82	82	82	82	82	83	83	84	88	92	97	100	101	98	94	90	81	80
Tue	80	79	79	79	79	78	78	78	77	77	77	77	77	76	76	78	85	90	93	91	89	86	83	76