31 Jan – 6 Feb 2024 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

76.7Weekly mean modelled AQI · Moderate

Mean PM2.5: 21.6 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+9 AQI compared with the previous week’s mean of 67.7.

Highest hourly estimate: 241 in Pattaya · 31 Jan, 00:00 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, 31 Jan	95.1Moderate	41–241	30.5	192 / 192
Thu, 1 Feb	83.7Moderate	48–201	20.2	192 / 192
Fri, 2 Feb	72.1Moderate	35–196	19.8	192 / 192
Sat, 3 Feb	68.5Moderate	38–156	19	192 / 192
Sun, 4 Feb	71.5Moderate	45–117	20.5	192 / 192
Mon, 5 Feb	71.9Moderate	52–96	20.2	192 / 192
Tue, 6 Feb	73.9Moderate	55–171	20.8	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	104	99	98	96	95	91	91	91	91	91	92	92	92	92	92	91	91	94	99	101	102	102	101	97
Thu	94	91	89	88	88	88	87	87	86	86	85	85	84	84	83	83	82	82	82	80	77	74	73	72
Fri	71	71	71	71	71	71	71	71	71	71	71	72	71	71	71	72	74	78	79	78	75	72	71	69
Sat	69	69	68	68	68	68	68	67	67	67	67	67	67	67	67	67	69	72	74	73	71	69	68	68
Sun	69	69	69	70	70	70	71	71	71	72	72	72	73	73	73	73	73	73	73	73	72	72	72	72
Mon	72	72	72	71	71	71	71	72	72	72	72	72	72	72	72	72	72	73	74	73	72	71	71	71
Tue	71	71	71	71	71	71	71	70	70	70	70	70	70	70	70	72	79	87	90	87	81	76	73	72

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
Nakhon Ratchasima	105.7Unhealthy for Sensitive Groups	196	37.1	168 / 168
Bangkok	101.4Unhealthy for Sensitive Groups	210	29.9	168 / 168
Khon Kaen	89.4Moderate	137	29.1	168 / 168
Pattaya	89.2Moderate	241	24.1	168 / 168
Chiang Mai	63.2Moderate	78	16.3	168 / 168
Chiang Rai	57.3Moderate	72	13.2	168 / 168
Phuket	56.3Moderate	76	12.8	168 / 168
Hat Yai	50.9Moderate	60	10.3	168 / 168

City-hours by category

Good: 113

Moderate: 1049

Unhealthy for Sensitive Groups: 90

Unhealthy: 77

Very Unhealthy: 15

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	104	99	98	96	95	91	91	91	91	91	92	92	92	92	92	91	91	94	99	101	102	102	101	97
Thu	94	91	89	88	88	88	87	87	86	86	85	85	84	84	83	83	82	82	82	80	77	74	73	72
Fri	71	71	71	71	71	71	71	71	71	71	71	72	71	71	71	72	74	78	79	78	75	72	71	69
Sat	69	69	68	68	68	68	68	67	67	67	67	67	67	67	67	67	69	72	74	73	71	69	68	68
Sun	69	69	69	70	70	70	71	71	71	72	72	72	73	73	73	73	73	73	73	73	72	72	72	72
Mon	72	72	72	71	71	71	71	72	72	72	72	72	72	72	72	72	72	73	74	73	72	71	71	71
Tue	71	71	71	71	71	71	71	70	70	70	70	70	70	70	70	72	79	87	90	87	81	76	73	72

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	104	99	98	96	95	91	91	91	91	91	92	92	92	92	92	91	91	94	99	101	102	102	101	97
Thu	94	91	89	88	88	88	87	87	86	86	85	85	84	84	83	83	82	82	82	80	77	74	73	72
Fri	71	71	71	71	71	71	71	71	71	71	71	72	71	71	71	72	74	78	79	78	75	72	71	69
Sat	69	69	68	68	68	68	68	67	67	67	67	67	67	67	67	67	69	72	74	73	71	69	68	68
Sun	69	69	69	70	70	70	71	71	71	72	72	72	73	73	73	73	73	73	73	73	72	72	72	72
Mon	72	72	72	71	71	71	71	72	72	72	72	72	72	72	72	72	72	73	74	73	72	71	71	71
Tue	71	71	71	71	71	71	71	70	70	70	70	70	70	70	70	72	79	87	90	87	81	76	73	72

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	104	99	98	96	95	91	91	91	91	91	92	92	92	92	92	91	91	94	99	101	102	102	101	97
Thu	94	91	89	88	88	88	87	87	86	86	85	85	84	84	83	83	82	82	82	80	77	74	73	72
Fri	71	71	71	71	71	71	71	71	71	71	71	72	71	71	71	72	74	78	79	78	75	72	71	69
Sat	69	69	68	68	68	68	68	67	67	67	67	67	67	67	67	67	69	72	74	73	71	69	68	68
Sun	69	69	69	70	70	70	71	71	71	72	72	72	73	73	73	73	73	73	73	73	72	72	72	72
Mon	72	72	72	71	71	71	71	72	72	72	72	72	72	72	72	72	72	73	74	73	72	71	71	71
Tue	71	71	71	71	71	71	71	70	70	70	70	70	70	70	70	72	79	87	90	87	81	76	73	72