29 Mar – 4 Apr 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

93.6Weekly mean modelled AQI · Moderate

Mean PM2.5: 31.8 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+14.2 AQI compared with the previous week’s mean of 79.4.

Highest hourly estimate: 251 in Bangkok · 4 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, 29 Mar	82.4Moderate	52–168	31.7	192 / 192
Thu, 30 Mar	92.9Moderate	44–189	35.4	192 / 192
Fri, 31 Mar	96.2Moderate	45–190	33.9	192 / 192
Sat, 1 Apr	95.1Moderate	56–182	30.8	192 / 192
Sun, 2 Apr	94.4Moderate	54–212	28.6	192 / 192
Mon, 3 Apr	92.9Moderate	54–228	29.9	192 / 192
Tue, 4 Apr	101.4Unhealthy for Sensitive Groups	53–251	32	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	75	75	75	75	75	75	76	76	77	78	80	81	83	84	85	86	87	88	90	91	91	91	92	92
Thu	92	93	93	93	93	94	94	94	94	93	93	92	92	91	91	91	91	92	95	97	96	93	92	92
Fri	93	93	93	94	94	94	94	94	94	94	95	95	96	96	96	96	101	105	106	104	100	95	94	94
Sat	94	94	94	93	93	93	92	93	92	92	92	92	92	92	92	96	100	103	106	105	102	97	93	92
Sun	92	92	92	92	92	92	92	92	92	93	93	93	93	93	94	98	101	102	102	101	99	95	90	89
Mon	89	88	88	88	88	88	88	89	90	91	91	92	91	90	90	93	98	100	102	102	100	100	99	95
Tue	92	92	93	94	95	95	96	97	97	98	98	99	100	101	103	107	111	113	113	112	110	109	107	105

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	141.8Unhealthy for Sensitive Groups	190	64.5	168 / 168
Chiang Mai	119.1Unhealthy for Sensitive Groups	162	43.1	168 / 168
Bangkok	115.1Unhealthy for Sensitive Groups	251	36.8	168 / 168
Khon Kaen	96.9Moderate	142	31.5	168 / 168
Nakhon Ratchasima	78.4Moderate	96	25	168 / 168
Pattaya	76.9Moderate	141	24.7	168 / 168
Phuket	61.1Moderate	71	14.1	168 / 168
Hat Yai	59.6Moderate	75	14.6	168 / 168

City-hours by category

Good: 17

Moderate: 933

Unhealthy for Sensitive Groups: 230

Unhealthy: 147

Very Unhealthy: 17

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	75	75	75	75	75	75	76	76	77	78	80	81	83	84	85	86	87	88	90	91	91	91	92	92
Thu	92	93	93	93	93	94	94	94	94	93	93	92	92	91	91	91	91	92	95	97	96	93	92	92
Fri	93	93	93	94	94	94	94	94	94	94	95	95	96	96	96	96	101	105	106	104	100	95	94	94
Sat	94	94	94	93	93	93	92	93	92	92	92	92	92	92	92	96	100	103	106	105	102	97	93	92
Sun	92	92	92	92	92	92	92	92	92	93	93	93	93	93	94	98	101	102	102	101	99	95	90	89
Mon	89	88	88	88	88	88	88	89	90	91	91	92	91	90	90	93	98	100	102	102	100	100	99	95
Tue	92	92	93	94	95	95	96	97	97	98	98	99	100	101	103	107	111	113	113	112	110	109	107	105

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	75	75	75	75	75	75	76	76	77	78	80	81	83	84	85	86	87	88	90	91	91	91	92	92
Thu	92	93	93	93	93	94	94	94	94	93	93	92	92	91	91	91	91	92	95	97	96	93	92	92
Fri	93	93	93	94	94	94	94	94	94	94	95	95	96	96	96	96	101	105	106	104	100	95	94	94
Sat	94	94	94	93	93	93	92	93	92	92	92	92	92	92	92	96	100	103	106	105	102	97	93	92
Sun	92	92	92	92	92	92	92	92	92	93	93	93	93	93	94	98	101	102	102	101	99	95	90	89
Mon	89	88	88	88	88	88	88	89	90	91	91	92	91	90	90	93	98	100	102	102	100	100	99	95
Tue	92	92	93	94	95	95	96	97	97	98	98	99	100	101	103	107	111	113	113	112	110	109	107	105

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	75	75	75	75	75	75	76	76	77	78	80	81	83	84	85	86	87	88	90	91	91	91	92	92
Thu	92	93	93	93	93	94	94	94	94	93	93	92	92	91	91	91	91	92	95	97	96	93	92	92
Fri	93	93	93	94	94	94	94	94	94	94	95	95	96	96	96	96	101	105	106	104	100	95	94	94
Sat	94	94	94	93	93	93	92	93	92	92	92	92	92	92	92	96	100	103	106	105	102	97	93	92
Sun	92	92	92	92	92	92	92	92	92	93	93	93	93	93	94	98	101	102	102	101	99	95	90	89
Mon	89	88	88	88	88	88	88	89	90	91	91	92	91	90	90	93	98	100	102	102	100	100	99	95
Tue	92	92	93	94	95	95	96	97	97	98	98	99	100	101	103	107	111	113	113	112	110	109	107	105