5 – 11 Apr 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

97.4Weekly mean modelled AQI · Moderate

Mean PM2.5: 31.5 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+3.8 AQI compared with the previous week’s mean of 93.6.

Highest hourly estimate: 246 in Bangkok · 5 Apr, 19:00 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, 5 Apr	99.3Moderate	49–246	29.1	192 / 192
Thu, 6 Apr	101.9Unhealthy for Sensitive Groups	52–234	37.5	192 / 192
Fri, 7 Apr	109.8Unhealthy for Sensitive Groups	57–184	41.6	192 / 192
Sat, 8 Apr	102.3Unhealthy for Sensitive Groups	59–184	31.7	192 / 192
Sun, 9 Apr	91.2Moderate	40–200	25.1	192 / 192
Mon, 10 Apr	84Moderate	40–176	23.8	192 / 192
Tue, 11 Apr	93.3Moderate	52–195	31.6	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	102	96	95	94	94	93	93	92	92	91	91	91	91	93	97	102	108	113	116	116	112	107	103	100
Thu	94	89	89	89	89	89	90	90	90	91	91	92	94	98	103	109	115	120	126	127	125	121	116	110
Fri	103	104	105	106	107	107	108	108	109	109	109	109	109	110	110	111	114	116	118	117	115	113	111	109
Sat	108	108	108	107	106	106	105	105	104	103	102	101	101	100	100	101	103	104	104	101	96	95	94	93
Sun	93	92	92	92	91	91	91	90	89	89	88	87	87	89	89	89	93	96	99	99	98	94	89	82
Mon	81	80	80	79	79	79	79	79	79	79	79	79	79	79	79	80	85	92	100	103	100	95	90	84
Tue	80	78	78	78	78	78	78	78	79	80	81	82	83	86	90	97	106	117	125	127	125	120	113	104

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
Chiang Rai	150Unhealthy for Sensitive Groups	195	65.1	168 / 168
Bangkok	129.6Unhealthy for Sensitive Groups	246	38.2	168 / 168
Chiang Mai	112.4Unhealthy for Sensitive Groups	149	40.1	168 / 168
Khon Kaen	103.2Unhealthy for Sensitive Groups	180	29.4	168 / 168
Nakhon Ratchasima	85.6Moderate	115	25.4	168 / 168
Pattaya	77.1Moderate	121	22.5	168 / 168
Hat Yai	63Moderate	82	16.5	168 / 168
Phuket	58.5Moderate	73	14.8	168 / 168

City-hours by category

Good: 54

Moderate: 813

Unhealthy for Sensitive Groups: 325

Unhealthy: 137

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	102	96	95	94	94	93	93	92	92	91	91	91	91	93	97	102	108	113	116	116	112	107	103	100
Thu	94	89	89	89	89	89	90	90	90	91	91	92	94	98	103	109	115	120	126	127	125	121	116	110
Fri	103	104	105	106	107	107	108	108	109	109	109	109	109	110	110	111	114	116	118	117	115	113	111	109
Sat	108	108	108	107	106	106	105	105	104	103	102	101	101	100	100	101	103	104	104	101	96	95	94	93
Sun	93	92	92	92	91	91	91	90	89	89	88	87	87	89	89	89	93	96	99	99	98	94	89	82
Mon	81	80	80	79	79	79	79	79	79	79	79	79	79	79	79	80	85	92	100	103	100	95	90	84
Tue	80	78	78	78	78	78	78	78	79	80	81	82	83	86	90	97	106	117	125	127	125	120	113	104

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	102	96	95	94	94	93	93	92	92	91	91	91	91	93	97	102	108	113	116	116	112	107	103	100
Thu	94	89	89	89	89	89	90	90	90	91	91	92	94	98	103	109	115	120	126	127	125	121	116	110
Fri	103	104	105	106	107	107	108	108	109	109	109	109	109	110	110	111	114	116	118	117	115	113	111	109
Sat	108	108	108	107	106	106	105	105	104	103	102	101	101	100	100	101	103	104	104	101	96	95	94	93
Sun	93	92	92	92	91	91	91	90	89	89	88	87	87	89	89	89	93	96	99	99	98	94	89	82
Mon	81	80	80	79	79	79	79	79	79	79	79	79	79	79	79	80	85	92	100	103	100	95	90	84
Tue	80	78	78	78	78	78	78	78	79	80	81	82	83	86	90	97	106	117	125	127	125	120	113	104

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	102	96	95	94	94	93	93	92	92	91	91	91	91	93	97	102	108	113	116	116	112	107	103	100
Thu	94	89	89	89	89	89	90	90	90	91	91	92	94	98	103	109	115	120	126	127	125	121	116	110
Fri	103	104	105	106	107	107	108	108	109	109	109	109	109	110	110	111	114	116	118	117	115	113	111	109
Sat	108	108	108	107	106	106	105	105	104	103	102	101	101	100	100	101	103	104	104	101	96	95	94	93
Sun	93	92	92	92	91	91	91	90	89	89	88	87	87	89	89	89	93	96	99	99	98	94	89	82
Mon	81	80	80	79	79	79	79	79	79	79	79	79	79	79	79	80	85	92	100	103	100	95	90	84
Tue	80	78	78	78	78	78	78	78	79	80	81	82	83	86	90	97	106	117	125	127	125	120	113	104