24 – 30 May 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

70.3Weekly mean modelled AQI · Moderate

Mean PM2.5: 18.1 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-0.8 AQI compared with the previous week’s mean of 71.1.

Highest hourly estimate: 291 in Bangkok · 29 May, 21:00 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, 24 May	66.8Moderate	39–144	15	192 / 192
Thu, 25 May	61.6Moderate	40–141	15.4	192 / 192
Fri, 26 May	70.1Moderate	33–259	19	192 / 192
Sat, 27 May	71.7Moderate	29–224	16.8	192 / 192
Sun, 28 May	70.4Moderate	32–264	19.5	192 / 192
Mon, 29 May	75.5Moderate	29–291	25.3	192 / 192
Tue, 30 May	75.9Moderate	28–219	15.6	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	65	65	65	65	65	64	64	64	64	64	63	63	63	63	62	63	66	73	77	78	76	74	69	68
Thu	66	64	61	60	59	59	59	59	59	59	59	59	59	59	59	59	61	65	69	71	69	66	62	61
Fri	61	61	61	61	62	62	62	62	62	62	63	63	63	67	71	76	78	82	85	86	86	85	83	81
Sat	79	74	68	68	68	68	68	67	67	67	67	67	67	67	67	70	74	78	81	82	81	79	77	72
Sun	65	63	63	63	63	64	64	64	64	64	64	64	64	66	71	75	76	78	82	84	84	83	82	80
Mon	78	75	69	70	70	70	70	71	71	72	72	74	76	77	80	83	86	76	74	74	74	87	84	81
Tue	78	73	73	73	72	72	71	71	71	70	70	69	69	68	71	75	83	90	93	91	88	84	77	70

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	143.2Unhealthy for Sensitive Groups	291	44.5	168 / 168
Nakhon Ratchasima	78.7Moderate	164	20.3	168 / 168
Chiang Mai	74.9Moderate	130	21.7	168 / 168
Chiang Rai	65.2Moderate	68	16.6	168 / 168
Khon Kaen	64.9Moderate	88	16	168 / 168
Pattaya	54.4Moderate	65	11.4	168 / 168
Phuket	44.6Good	53	7.9	168 / 168
Hat Yai	36.4Good	49	6.3	168 / 168

City-hours by category

Good: 362

Moderate: 853

Unhealthy for Sensitive Groups: 49

Unhealthy: 42

Very Unhealthy: 38

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	65	65	65	65	65	64	64	64	64	64	63	63	63	63	62	63	66	73	77	78	76	74	69	68
Thu	66	64	61	60	59	59	59	59	59	59	59	59	59	59	59	59	61	65	69	71	69	66	62	61
Fri	61	61	61	61	62	62	62	62	62	62	63	63	63	67	71	76	78	82	85	86	86	85	83	81
Sat	79	74	68	68	68	68	68	67	67	67	67	67	67	67	67	70	74	78	81	82	81	79	77	72
Sun	65	63	63	63	63	64	64	64	64	64	64	64	64	66	71	75	76	78	82	84	84	83	82	80
Mon	78	75	69	70	70	70	70	71	71	72	72	74	76	77	80	83	86	76	74	74	74	87	84	81
Tue	78	73	73	73	72	72	71	71	71	70	70	69	69	68	71	75	83	90	93	91	88	84	77	70

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	65	65	65	65	65	64	64	64	64	64	63	63	63	63	62	63	66	73	77	78	76	74	69	68
Thu	66	64	61	60	59	59	59	59	59	59	59	59	59	59	59	59	61	65	69	71	69	66	62	61
Fri	61	61	61	61	62	62	62	62	62	62	63	63	63	67	71	76	78	82	85	86	86	85	83	81
Sat	79	74	68	68	68	68	68	67	67	67	67	67	67	67	67	70	74	78	81	82	81	79	77	72
Sun	65	63	63	63	63	64	64	64	64	64	64	64	64	66	71	75	76	78	82	84	84	83	82	80
Mon	78	75	69	70	70	70	70	71	71	72	72	74	76	77	80	83	86	76	74	74	74	87	84	81
Tue	78	73	73	73	72	72	71	71	71	70	70	69	69	68	71	75	83	90	93	91	88	84	77	70

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	65	65	65	65	65	64	64	64	64	64	63	63	63	63	62	63	66	73	77	78	76	74	69	68
Thu	66	64	61	60	59	59	59	59	59	59	59	59	59	59	59	59	61	65	69	71	69	66	62	61
Fri	61	61	61	61	62	62	62	62	62	62	63	63	63	67	71	76	78	82	85	86	86	85	83	81
Sat	79	74	68	68	68	68	68	67	67	67	67	67	67	67	67	70	74	78	81	82	81	79	77	72
Sun	65	63	63	63	63	64	64	64	64	64	64	64	64	66	71	75	76	78	82	84	84	83	82	80
Mon	78	75	69	70	70	70	70	71	71	72	72	74	76	77	80	83	86	76	74	74	74	87	84	81
Tue	78	73	73	73	72	72	71	71	71	70	70	69	69	68	71	75	83	90	93	91	88	84	77	70