15 – 21 Feb 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

91.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 30.3 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+13 AQI compared with the previous week’s mean of 78.9.

Highest hourly estimate: 300 in Pattaya · 19 Feb, 18:00 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, 15 Feb	82.2Moderate	50–128	23.9	192 / 192
Thu, 16 Feb	78.9Moderate	47–192	21.5	192 / 192
Fri, 17 Feb	78.2Moderate	43–216	24	192 / 192
Sat, 18 Feb	95.5Moderate	51–263	30.3	192 / 192
Sun, 19 Feb	108.5Unhealthy for Sensitive Groups	50–300	43.4	192 / 192
Mon, 20 Feb	103.7Unhealthy for Sensitive Groups	45–299	31.9	192 / 192
Tue, 21 Feb	96.2Moderate	50–262	37.4	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	84	84	83	84	84	84	84	84	83	82	81	81	81	81	81	81	81	82	83	83	82	81	79	79
Thu	79	79	79	80	80	80	80	81	81	80	80	80	79	78	77	76	78	81	82	82	78	75	75	75
Fri	75	75	74	74	74	74	74	74	74	74	74	74	75	75	75	75	80	85	89	90	90	89	83	82
Sat	80	80	81	81	82	82	82	83	83	84	84	85	86	90	93	98	109	116	122	125	123	119	114	111
Sun	105	104	103	102	101	96	96	96	97	97	98	103	109	115	119	127	129	131	129	116	112	108	104	110
Mon	103	101	101	116	115	113	111	109	107	105	103	101	99	97	98	100	103	107	109	106	101	98	96	95
Tue	92	94	95	95	96	97	97	96	94	93	93	93	93	93	93	95	99	103	105	104	102	99	96	94

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	173.6Unhealthy	293	84.3	168 / 168
Pattaya	120.9Unhealthy for Sensitive Groups	300	37.9	168 / 168
Chiang Mai	101.1Unhealthy for Sensitive Groups	177	32.1	168 / 168
Chiang Rai	97.8Moderate	128	32.8	168 / 168
Khon Kaen	67.5Moderate	87	16.5	168 / 168
Nakhon Ratchasima	66.6Moderate	89	16.9	168 / 168
Phuket	55.6Moderate	64	11.8	168 / 168
Hat Yai	52.1Moderate	57	10.4	168 / 168

City-hours by category

Good: 82

Moderate: 900

Unhealthy for Sensitive Groups: 206

Unhealthy: 69

Very Unhealthy: 87

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	84	84	83	84	84	84	84	84	83	82	81	81	81	81	81	81	81	82	83	83	82	81	79	79
Thu	79	79	79	80	80	80	80	81	81	80	80	80	79	78	77	76	78	81	82	82	78	75	75	75
Fri	75	75	74	74	74	74	74	74	74	74	74	74	75	75	75	75	80	85	89	90	90	89	83	82
Sat	80	80	81	81	82	82	82	83	83	84	84	85	86	90	93	98	109	116	122	125	123	119	114	111
Sun	105	104	103	102	101	96	96	96	97	97	98	103	109	115	119	127	129	131	129	116	112	108	104	110
Mon	103	101	101	116	115	113	111	109	107	105	103	101	99	97	98	100	103	107	109	106	101	98	96	95
Tue	92	94	95	95	96	97	97	96	94	93	93	93	93	93	93	95	99	103	105	104	102	99	96	94

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	84	84	83	84	84	84	84	84	83	82	81	81	81	81	81	81	81	82	83	83	82	81	79	79
Thu	79	79	79	80	80	80	80	81	81	80	80	80	79	78	77	76	78	81	82	82	78	75	75	75
Fri	75	75	74	74	74	74	74	74	74	74	74	74	75	75	75	75	80	85	89	90	90	89	83	82
Sat	80	80	81	81	82	82	82	83	83	84	84	85	86	90	93	98	109	116	122	125	123	119	114	111
Sun	105	104	103	102	101	96	96	96	97	97	98	103	109	115	119	127	129	131	129	116	112	108	104	110
Mon	103	101	101	116	115	113	111	109	107	105	103	101	99	97	98	100	103	107	109	106	101	98	96	95
Tue	92	94	95	95	96	97	97	96	94	93	93	93	93	93	93	95	99	103	105	104	102	99	96	94

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	84	84	83	84	84	84	84	84	83	82	81	81	81	81	81	81	81	82	83	83	82	81	79	79
Thu	79	79	79	80	80	80	80	81	81	80	80	80	79	78	77	76	78	81	82	82	78	75	75	75
Fri	75	75	74	74	74	74	74	74	74	74	74	74	75	75	75	75	80	85	89	90	90	89	83	82
Sat	80	80	81	81	82	82	82	83	83	84	84	85	86	90	93	98	109	116	122	125	123	119	114	111
Sun	105	104	103	102	101	96	96	96	97	97	98	103	109	115	119	127	129	131	129	116	112	108	104	110
Mon	103	101	101	116	115	113	111	109	107	105	103	101	99	97	98	100	103	107	109	106	101	98	96	95
Tue	92	94	95	95	96	97	97	96	94	93	93	93	93	93	93	95	99	103	105	104	102	99	96	94