8 – 14 May 2024 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

73.7Weekly mean modelled AQI · Moderate

Mean PM2.5: 19.5 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-6.6 AQI compared with the previous week’s mean of 80.3.

Highest hourly estimate: 285 in Bangkok · 12 May, 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, 8 May	87.7Moderate	43–262	26.2	192 / 192
Thu, 9 May	76.4Moderate	40–211	17.6	192 / 192
Fri, 10 May	63.1Moderate	25–90	15.6	192 / 192
Sat, 11 May	61.5Moderate	26–109	16.2	192 / 192
Sun, 12 May	77.7Moderate	31–285	21.4	192 / 192
Mon, 13 May	72.6Moderate	39–207	18	192 / 192
Tue, 14 May	76.8Moderate	34–254	21.9	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	74	74	74	75	75	75	75	76	76	76	76	77	77	85	90	93	97	105	111	113	112	109	106	102
Thu	96	88	83	83	82	81	81	80	79	79	78	78	77	76	75	73	72	72	70	68	66	66	66	65
Fri	65	65	65	66	66	65	65	65	65	65	64	64	63	63	63	62	62	62	61	61	61	60	59	59
Sat	59	59	59	59	59	59	58	58	58	59	59	59	59	60	60	61	62	65	70	71	70	67	64	63
Sun	63	63	63	63	63	63	64	64	65	65	65	66	72	77	80	86	98	106	109	106	101	94	88	83
Mon	80	75	73	73	73	74	74	73	73	73	74	73	73	72	71	72	73	76	75	73	70	67	66	66
Tue	66	66	66	66	66	66	66	66	66	65	65	64	64	70	75	79	82	90	97	101	101	101	99	96

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	113.8Unhealthy for Sensitive Groups	285	34.2	168 / 168
Chiang Rai	86.2Moderate	150	24.6	168 / 168
Chiang Mai	81.3Moderate	100	24.2	168 / 168
Nakhon Ratchasima	76.4Moderate	125	21.7	168 / 168
Khon Kaen	71.1Moderate	130	17.3	168 / 168
Pattaya	67.6Moderate	143	16.4	168 / 168
Hat Yai	48.3Good	64	10.2	168 / 168
Phuket	44.7Good	86	7.8	168 / 168

City-hours by category

Good: 204

Moderate: 998

Unhealthy for Sensitive Groups: 103

Unhealthy: 12

Very Unhealthy: 27

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	74	74	74	75	75	75	75	76	76	76	76	77	77	85	90	93	97	105	111	113	112	109	106	102
Thu	96	88	83	83	82	81	81	80	79	79	78	78	77	76	75	73	72	72	70	68	66	66	66	65
Fri	65	65	65	66	66	65	65	65	65	65	64	64	63	63	63	62	62	62	61	61	61	60	59	59
Sat	59	59	59	59	59	59	58	58	58	59	59	59	59	60	60	61	62	65	70	71	70	67	64	63
Sun	63	63	63	63	63	63	64	64	65	65	65	66	72	77	80	86	98	106	109	106	101	94	88	83
Mon	80	75	73	73	73	74	74	73	73	73	74	73	73	72	71	72	73	76	75	73	70	67	66	66
Tue	66	66	66	66	66	66	66	66	66	65	65	64	64	70	75	79	82	90	97	101	101	101	99	96

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	74	74	74	75	75	75	75	76	76	76	76	77	77	85	90	93	97	105	111	113	112	109	106	102
Thu	96	88	83	83	82	81	81	80	79	79	78	78	77	76	75	73	72	72	70	68	66	66	66	65
Fri	65	65	65	66	66	65	65	65	65	65	64	64	63	63	63	62	62	62	61	61	61	60	59	59
Sat	59	59	59	59	59	59	58	58	58	59	59	59	59	60	60	61	62	65	70	71	70	67	64	63
Sun	63	63	63	63	63	63	64	64	65	65	65	66	72	77	80	86	98	106	109	106	101	94	88	83
Mon	80	75	73	73	73	74	74	73	73	73	74	73	73	72	71	72	73	76	75	73	70	67	66	66
Tue	66	66	66	66	66	66	66	66	66	65	65	64	64	70	75	79	82	90	97	101	101	101	99	96

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	74	74	74	75	75	75	75	76	76	76	76	77	77	85	90	93	97	105	111	113	112	109	106	102
Thu	96	88	83	83	82	81	81	80	79	79	78	78	77	76	75	73	72	72	70	68	66	66	66	65
Fri	65	65	65	66	66	65	65	65	65	65	64	64	63	63	63	62	62	62	61	61	61	60	59	59
Sat	59	59	59	59	59	59	58	58	58	59	59	59	59	60	60	61	62	65	70	71	70	67	64	63
Sun	63	63	63	63	63	63	64	64	65	65	65	66	72	77	80	86	98	106	109	106	101	94	88	83
Mon	80	75	73	73	73	74	74	73	73	73	74	73	73	72	71	72	73	76	75	73	70	67	66	66
Tue	66	66	66	66	66	66	66	66	66	65	65	64	64	70	75	79	82	90	97	101	101	101	99	96