19 – 25 Oct 2022 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

83.7Weekly mean modelled AQI · Moderate

Mean PM2.5: 29.2 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+5.7 AQI compared with the previous week’s mean of 78.

Highest hourly estimate: 301 in Bangkok · 24 Oct, 22:00 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, 19 Oct	79.8Moderate	19–227	26.7	192 / 192
Thu, 20 Oct	82.1Moderate	25–221	22	192 / 192
Fri, 21 Oct	69.7Moderate	34–151	18.3	192 / 192
Sat, 22 Oct	68.5Moderate	31–267	17.8	192 / 192
Sun, 23 Oct	75.9Moderate	33–296	31.5	192 / 192
Mon, 24 Oct	100.3Unhealthy for Sensitive Groups	37–301	48.5	192 / 192
Tue, 25 Oct	109.6Unhealthy for Sensitive Groups	29–297	39.4	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	77	77	76	76	76	76	76	76	75	76	76	77	77	78	78	78	86	89	90	89	88	86	82	81
Thu	81	81	81	81	82	82	82	82	82	82	82	82	81	81	80	81	85	86	87	86	85	84	80	76
Fri	75	75	74	74	73	72	72	72	71	70	70	69	68	68	67	67	67	67	67	67	67	67	67	67
Sat	67	66	65	65	64	64	64	63	63	63	63	63	63	66	68	71	74	76	78	78	77	76	75	73
Sun	71	69	65	65	65	66	67	68	69	70	71	72	73	75	77	82	88	94	82	81	81	83	95	94
Mon	91	89	90	90	90	89	88	89	90	91	92	93	95	98	102	106	113	116	118	118	115	115	115	115
Tue	115	115	115	114	114	113	111	109	106	103	102	106	111	115	118	122	113	112	109	99	98	97	97	120

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	199Unhealthy	301	102.2	168 / 168
Pattaya	108.5Unhealthy for Sensitive Groups	286	35.6	168 / 168
Chiang Mai	82Moderate	119	25.4	168 / 168
Khon Kaen	75.3Moderate	98	21.5	168 / 168
Nakhon Ratchasima	73.4Moderate	99	20.8	168 / 168
Chiang Rai	55.8Moderate	75	13.9	168 / 168
Hat Yai	39.2Good	52	7.4	168 / 168
Phuket	36.3Good	43	6.5	168 / 168

City-hours by category

Good: 371

Moderate: 747

Unhealthy for Sensitive Groups: 59

Unhealthy: 65

Very Unhealthy: 101

Hazardous: 1

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	77	77	76	76	76	76	76	76	75	76	76	77	77	78	78	78	86	89	90	89	88	86	82	81
Thu	81	81	81	81	82	82	82	82	82	82	82	82	81	81	80	81	85	86	87	86	85	84	80	76
Fri	75	75	74	74	73	72	72	72	71	70	70	69	68	68	67	67	67	67	67	67	67	67	67	67
Sat	67	66	65	65	64	64	64	63	63	63	63	63	63	66	68	71	74	76	78	78	77	76	75	73
Sun	71	69	65	65	65	66	67	68	69	70	71	72	73	75	77	82	88	94	82	81	81	83	95	94
Mon	91	89	90	90	90	89	88	89	90	91	92	93	95	98	102	106	113	116	118	118	115	115	115	115
Tue	115	115	115	114	114	113	111	109	106	103	102	106	111	115	118	122	113	112	109	99	98	97	97	120

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	77	77	76	76	76	76	76	76	75	76	76	77	77	78	78	78	86	89	90	89	88	86	82	81
Thu	81	81	81	81	82	82	82	82	82	82	82	82	81	81	80	81	85	86	87	86	85	84	80	76
Fri	75	75	74	74	73	72	72	72	71	70	70	69	68	68	67	67	67	67	67	67	67	67	67	67
Sat	67	66	65	65	64	64	64	63	63	63	63	63	63	66	68	71	74	76	78	78	77	76	75	73
Sun	71	69	65	65	65	66	67	68	69	70	71	72	73	75	77	82	88	94	82	81	81	83	95	94
Mon	91	89	90	90	90	89	88	89	90	91	92	93	95	98	102	106	113	116	118	118	115	115	115	115
Tue	115	115	115	114	114	113	111	109	106	103	102	106	111	115	118	122	113	112	109	99	98	97	97	120

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	77	77	76	76	76	76	76	76	75	76	76	77	77	78	78	78	86	89	90	89	88	86	82	81
Thu	81	81	81	81	82	82	82	82	82	82	82	82	81	81	80	81	85	86	87	86	85	84	80	76
Fri	75	75	74	74	73	72	72	72	71	70	70	69	68	68	67	67	67	67	67	67	67	67	67	67
Sat	67	66	65	65	64	64	64	63	63	63	63	63	63	66	68	71	74	76	78	78	77	76	75	73
Sun	71	69	65	65	65	66	67	68	69	70	71	72	73	75	77	82	88	94	82	81	81	83	95	94
Mon	91	89	90	90	90	89	88	89	90	91	92	93	95	98	102	106	113	116	118	118	115	115	115	115
Tue	115	115	115	114	114	113	111	109	106	103	102	106	111	115	118	122	113	112	109	99	98	97	97	120