3 – 9 Jan 2024 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

72.6Weekly mean modelled AQI · Moderate

Mean PM2.5: 20 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+4.8 AQI compared with the previous week’s mean of 67.8.

Highest hourly estimate: 287 in Bangkok · 9 Jan, 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, 3 Jan	75.4Moderate	37–207	15.8	192 / 192
Thu, 4 Jan	58.6Moderate	30–119	13.3	192 / 192
Fri, 5 Jan	60.8Moderate	31–149	16.4	192 / 192
Sat, 6 Jan	71.2Moderate	44–172	18.6	192 / 192
Sun, 7 Jan	72.2Moderate	37–153	20.3	192 / 192
Mon, 8 Jan	78.3Moderate	44–224	21.8	192 / 192
Tue, 9 Jan	91.9Moderate	49–287	34	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	88	84	81	81	80	80	79	78	78	77	76	76	75	74	73	72	73	73	71	70	69	69	68	67
Thu	66	63	60	59	59	59	58	58	58	58	57	57	58	58	58	59	59	59	59	59	58	57	56	56
Fri	55	55	55	55	55	55	56	56	57	57	58	59	59	59	60	60	60	62	68	71	71	72	73	74
Sat	74	74	74	72	70	68	67	68	67	67	67	67	67	67	66	67	67	72	78	80	79	77	77	77
Sun	75	73	69	69	69	69	69	68	69	70	70	70	70	70	71	71	71	73	75	77	78	79	79	79
Mon	78	75	72	72	72	72	72	72	71	71	71	71	71	71	71	73	74	85	90	95	97	97	96	92
Tue	89	88	87	85	83	81	78	76	77	77	78	79	80	84	91	96	98	104	110	113	114	115	114	112

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	141Unhealthy for Sensitive Groups	287	56.5	168 / 168
Pattaya	113.9Unhealthy for Sensitive Groups	287	31.2	168 / 168
Chiang Mai	68.8Moderate	103	18.5	168 / 168
Phuket	56.9Moderate	69	13	168 / 168
Chiang Rai	54.2Moderate	66	11.6	168 / 168
Hat Yai	54Moderate	59	11.4	168 / 168
Nakhon Ratchasima	46.4Good	59	9.2	168 / 168
Khon Kaen	45.8Good	61	8.9	168 / 168

City-hours by category

Good: 272

Moderate: 865

Unhealthy for Sensitive Groups: 117

Unhealthy: 59

Very Unhealthy: 31

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	88	84	81	81	80	80	79	78	78	77	76	76	75	74	73	72	73	73	71	70	69	69	68	67
Thu	66	63	60	59	59	59	58	58	58	58	57	57	58	58	58	59	59	59	59	59	58	57	56	56
Fri	55	55	55	55	55	55	56	56	57	57	58	59	59	59	60	60	60	62	68	71	71	72	73	74
Sat	74	74	74	72	70	68	67	68	67	67	67	67	67	67	66	67	67	72	78	80	79	77	77	77
Sun	75	73	69	69	69	69	69	68	69	70	70	70	70	70	71	71	71	73	75	77	78	79	79	79
Mon	78	75	72	72	72	72	72	72	71	71	71	71	71	71	71	73	74	85	90	95	97	97	96	92
Tue	89	88	87	85	83	81	78	76	77	77	78	79	80	84	91	96	98	104	110	113	114	115	114	112

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	88	84	81	81	80	80	79	78	78	77	76	76	75	74	73	72	73	73	71	70	69	69	68	67
Thu	66	63	60	59	59	59	58	58	58	58	57	57	58	58	58	59	59	59	59	59	58	57	56	56
Fri	55	55	55	55	55	55	56	56	57	57	58	59	59	59	60	60	60	62	68	71	71	72	73	74
Sat	74	74	74	72	70	68	67	68	67	67	67	67	67	67	66	67	67	72	78	80	79	77	77	77
Sun	75	73	69	69	69	69	69	68	69	70	70	70	70	70	71	71	71	73	75	77	78	79	79	79
Mon	78	75	72	72	72	72	72	72	71	71	71	71	71	71	71	73	74	85	90	95	97	97	96	92
Tue	89	88	87	85	83	81	78	76	77	77	78	79	80	84	91	96	98	104	110	113	114	115	114	112

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	88	84	81	81	80	80	79	78	78	77	76	76	75	74	73	72	73	73	71	70	69	69	68	67
Thu	66	63	60	59	59	59	58	58	58	58	57	57	58	58	58	59	59	59	59	59	58	57	56	56
Fri	55	55	55	55	55	55	56	56	57	57	58	59	59	59	60	60	60	62	68	71	71	72	73	74
Sat	74	74	74	72	70	68	67	68	67	67	67	67	67	67	66	67	67	72	78	80	79	77	77	77
Sun	75	73	69	69	69	69	69	68	69	70	70	70	70	70	71	71	71	73	75	77	78	79	79	79
Mon	78	75	72	72	72	72	72	72	71	71	71	71	71	71	71	73	74	85	90	95	97	97	96	92
Tue	89	88	87	85	83	81	78	76	77	77	78	79	80	84	91	96	98	104	110	113	114	115	114	112