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

Thailand weekly air quality

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

90.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 27.2 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-23.6 AQI compared with the previous week’s mean of 113.9.

Highest hourly estimate: 298 in Bangkok · 15 Mar, 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, 15 Mar	108.2Unhealthy for Sensitive Groups	58–298	35.6	192 / 192
Thu, 16 Mar	90.6Moderate	56–202	24.4	192 / 192
Fri, 17 Mar	88Moderate	52–191	29.5	192 / 192
Sat, 18 Mar	91.3Moderate	51–156	27.3	192 / 192
Sun, 19 Mar	86.1Moderate	51–155	27.4	192 / 192
Mon, 20 Mar	88.1Moderate	51–181	25.2	192 / 192
Tue, 21 Mar	80Moderate	51–171	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	118	115	112	108	105	101	101	101	101	101	102	103	104	106	108	111	117	109	113	113	122	115	109	104
Thu	99	96	95	95	94	93	92	91	90	89	87	86	85	83	83	83	86	93	98	98	94	91	88	84
Fri	80	79	80	80	80	80	80	80	81	82	82	83	84	85	86	90	97	103	106	106	102	100	95	91
Sat	91	91	91	91	91	91	91	92	91	91	90	90	90	89	89	88	95	99	101	99	94	88	85	86
Sun	86	86	86	85	85	85	86	86	86	85	85	85	86	86	86	86	85	86	88	89	89	89	88	86
Mon	86	86	86	87	87	86	86	86	86	85	85	85	85	85	85	86	94	99	101	100	96	90	82	82
Tue	81	80	80	80	79	79	79	78	78	78	78	78	77	79	81	83	86	89	90	87	82	75	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
Bangkok	122.4Unhealthy for Sensitive Groups	298	36.6	168 / 168
Khon Kaen	114.3Unhealthy for Sensitive Groups	171	38.6	168 / 168
Chiang Mai	110.1Unhealthy for Sensitive Groups	153	36.8	168 / 168
Chiang Rai	100.1Unhealthy for Sensitive Groups	121	33.4	168 / 168
Nakhon Ratchasima	95.2Moderate	156	31.5	168 / 168
Pattaya	67.9Moderate	159	16.8	168 / 168
Phuket	56.9Moderate	65	12.4	168 / 168
Hat Yai	55.8Moderate	66	11.6	168 / 168

City-hours by category

Good: 0

Moderate: 904

Unhealthy for Sensitive Groups: 370

Unhealthy: 56

Very Unhealthy: 14

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	118	115	112	108	105	101	101	101	101	101	102	103	104	106	108	111	117	109	113	113	122	115	109	104
Thu	99	96	95	95	94	93	92	91	90	89	87	86	85	83	83	83	86	93	98	98	94	91	88	84
Fri	80	79	80	80	80	80	80	80	81	82	82	83	84	85	86	90	97	103	106	106	102	100	95	91
Sat	91	91	91	91	91	91	91	92	91	91	90	90	90	89	89	88	95	99	101	99	94	88	85	86
Sun	86	86	86	85	85	85	86	86	86	85	85	85	86	86	86	86	85	86	88	89	89	89	88	86
Mon	86	86	86	87	87	86	86	86	86	85	85	85	85	85	85	86	94	99	101	100	96	90	82	82
Tue	81	80	80	80	79	79	79	78	78	78	78	78	77	79	81	83	86	89	90	87	82	75	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	118	115	112	108	105	101	101	101	101	101	102	103	104	106	108	111	117	109	113	113	122	115	109	104
Thu	99	96	95	95	94	93	92	91	90	89	87	86	85	83	83	83	86	93	98	98	94	91	88	84
Fri	80	79	80	80	80	80	80	80	81	82	82	83	84	85	86	90	97	103	106	106	102	100	95	91
Sat	91	91	91	91	91	91	91	92	91	91	90	90	90	89	89	88	95	99	101	99	94	88	85	86
Sun	86	86	86	85	85	85	86	86	86	85	85	85	86	86	86	86	85	86	88	89	89	89	88	86
Mon	86	86	86	87	87	86	86	86	86	85	85	85	85	85	85	86	94	99	101	100	96	90	82	82
Tue	81	80	80	80	79	79	79	78	78	78	78	78	77	79	81	83	86	89	90	87	82	75	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	118	115	112	108	105	101	101	101	101	101	102	103	104	106	108	111	117	109	113	113	122	115	109	104
Thu	99	96	95	95	94	93	92	91	90	89	87	86	85	83	83	83	86	93	98	98	94	91	88	84
Fri	80	79	80	80	80	80	80	80	81	82	82	83	84	85	86	90	97	103	106	106	102	100	95	91
Sat	91	91	91	91	91	91	91	92	91	91	90	90	90	89	89	88	95	99	101	99	94	88	85	86
Sun	86	86	86	85	85	85	86	86	86	85	85	85	86	86	86	86	85	86	88	89	89	89	88	86
Mon	86	86	86	87	87	86	86	86	86	85	85	85	85	85	85	86	94	99	101	100	96	90	82	82
Tue	81	80	80	80	79	79	79	78	78	78	78	78	77	79	81	83	86	89	90	87	82	75	73	72