10 – 16 May 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

62.4Weekly mean modelled AQI · Moderate

Mean PM2.5: 14.9 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-10.7 AQI compared with the previous week’s mean of 73.1.

Highest hourly estimate: 235 in Bangkok · 16 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, 10 May	67.8Moderate	42–89	18.3	192 / 192
Thu, 11 May	67.7Moderate	40–189	15.8	192 / 192
Fri, 12 May	62.1Moderate	50–88	14.3	192 / 192
Sat, 13 May	57.5Moderate	46–94	11.3	192 / 192
Sun, 14 May	52Moderate	37–68	11.2	192 / 192
Mon, 15 May	57.5Moderate	43–129	14.1	192 / 192
Tue, 16 May	72.1Moderate	45–235	19.2	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	69	68	68	68	68	68	68	68	68	68	68	68	68	68	68	68	68	67	68	67	67	67	67	67
Thu	67	67	66	66	66	66	66	66	66	65	65	65	65	65	65	67	72	76	78	77	74	69	63	63
Fri	63	63	63	63	63	62	62	62	62	62	62	62	62	62	62	61	61	62	64	65	62	60	60	60
Sat	60	60	60	59	59	59	58	58	58	58	57	57	57	57	57	57	58	59	58	56	55	55	54	54
Sun	54	54	54	53	53	53	52	52	52	52	52	51	51	51	51	51	51	51	51	51	52	52	52	53
Mon	53	53	54	54	55	55	55	56	56	56	56	56	56	56	57	57	57	61	64	66	66	64	62	59
Tue	60	60	61	61	62	62	63	63	64	64	64	65	65	68	72	76	78	86	92	94	93	90	86	83

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	87.8Moderate	235	24.1	168 / 168
Nakhon Ratchasima	69.2Moderate	127	18.8	168 / 168
Khon Kaen	63.8Moderate	90	15.9	168 / 168
Chiang Mai	61.2Moderate	88	14.7	168 / 168
Chiang Rai	58.5Moderate	83	13.1	168 / 168
Hat Yai	57.7Moderate	64	12.7	168 / 168
Pattaya	51.4Moderate	65	10.6	168 / 168
Phuket	49.4Good	57	9.3	168 / 168

City-hours by category

Good: 198

Moderate: 1115

Unhealthy for Sensitive Groups: 17

Unhealthy: 7

Very Unhealthy: 7

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	69	68	68	68	68	68	68	68	68	68	68	68	68	68	68	68	68	67	68	67	67	67	67	67
Thu	67	67	66	66	66	66	66	66	66	65	65	65	65	65	65	67	72	76	78	77	74	69	63	63
Fri	63	63	63	63	63	62	62	62	62	62	62	62	62	62	62	61	61	62	64	65	62	60	60	60
Sat	60	60	60	59	59	59	58	58	58	58	57	57	57	57	57	57	58	59	58	56	55	55	54	54
Sun	54	54	54	53	53	53	52	52	52	52	52	51	51	51	51	51	51	51	51	51	52	52	52	53
Mon	53	53	54	54	55	55	55	56	56	56	56	56	56	56	57	57	57	61	64	66	66	64	62	59
Tue	60	60	61	61	62	62	63	63	64	64	64	65	65	68	72	76	78	86	92	94	93	90	86	83

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	69	68	68	68	68	68	68	68	68	68	68	68	68	68	68	68	68	67	68	67	67	67	67	67
Thu	67	67	66	66	66	66	66	66	66	65	65	65	65	65	65	67	72	76	78	77	74	69	63	63
Fri	63	63	63	63	63	62	62	62	62	62	62	62	62	62	62	61	61	62	64	65	62	60	60	60
Sat	60	60	60	59	59	59	58	58	58	58	57	57	57	57	57	57	58	59	58	56	55	55	54	54
Sun	54	54	54	53	53	53	52	52	52	52	52	51	51	51	51	51	51	51	51	51	52	52	52	53
Mon	53	53	54	54	55	55	55	56	56	56	56	56	56	56	57	57	57	61	64	66	66	64	62	59
Tue	60	60	61	61	62	62	63	63	64	64	64	65	65	68	72	76	78	86	92	94	93	90	86	83

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	69	68	68	68	68	68	68	68	68	68	68	68	68	68	68	68	68	67	68	67	67	67	67	67
Thu	67	67	66	66	66	66	66	66	66	65	65	65	65	65	65	67	72	76	78	77	74	69	63	63
Fri	63	63	63	63	63	62	62	62	62	62	62	62	62	62	62	61	61	62	64	65	62	60	60	60
Sat	60	60	60	59	59	59	58	58	58	58	57	57	57	57	57	57	58	59	58	56	55	55	54	54
Sun	54	54	54	53	53	53	52	52	52	52	52	51	51	51	51	51	51	51	51	51	52	52	52	53
Mon	53	53	54	54	55	55	55	56	56	56	56	56	56	56	57	57	57	61	64	66	66	64	62	59
Tue	60	60	61	61	62	62	63	63	64	64	64	65	65	68	72	76	78	86	92	94	93	90	86	83