31 May – 6 Jun 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

56.9Weekly mean modelled AQI · Moderate

Mean PM2.5: 11.9 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-13.4 AQI compared with the previous week’s mean of 70.3.

Highest hourly estimate: 225 in Bangkok · 1 Jun, 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, 31 May	65.7Moderate	26–207	14.1	192 / 192
Thu, 1 Jun	63.7Moderate	24–225	13	192 / 192
Fri, 2 Jun	61.7Moderate	29–215	11.9	192 / 192
Sat, 3 Jun	53.7Moderate	28–126	11	192 / 192
Sun, 4 Jun	51.3Moderate	22–113	10.9	192 / 192
Mon, 5 Jun	50.1Moderate	21–88	11.1	192 / 192
Tue, 6 Jun	52.4Moderate	19–75	11.5	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	63	60	59	58	58	58	57	56	56	57	56	56	57	59	64	68	73	80	84	84	83	81	78	74
Thu	67	62	61	59	58	56	56	56	56	55	55	55	55	56	60	64	69	75	78	79	77	76	73	71
Fri	65	57	55	55	55	55	55	55	55	55	55	55	55	55	59	65	69	75	79	79	75	72	67	61
Sat	52	52	52	52	52	52	53	53	52	52	52	52	52	52	52	52	52	56	58	59	58	57	57	56
Sun	55	54	53	52	50	50	49	50	50	50	50	50	50	50	50	50	51	51	53	55	54	53	51	50
Mon	50	51	50	50	50	49	49	49	49	49	49	49	49	49	49	49	49	51	53	54	54	52	51	51
Tue	51	51	51	51	51	51	51	52	52	52	53	53	53	54	54	54	54	54	54	54	53	53	53	53

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	88.3Moderate	225	17.4	168 / 168
Nakhon Ratchasima	76Moderate	135	17.6	168 / 168
Khon Kaen	63.7Moderate	134	14.5	168 / 168
Chiang Mai	60.4Moderate	83	14	168 / 168
Chiang Rai	54.6Moderate	59	11.6	168 / 168
Phuket	48.3Good	56	9.4	168 / 168
Hat Yai	33.5Good	46	6.1	168 / 168
Pattaya	30.6Good	45	5	168 / 168

City-hours by category

Good: 426

Moderate: 860

Unhealthy for Sensitive Groups: 35

Unhealthy: 10

Very Unhealthy: 13

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	63	60	59	58	58	58	57	56	56	57	56	56	57	59	64	68	73	80	84	84	83	81	78	74
Thu	67	62	61	59	58	56	56	56	56	55	55	55	55	56	60	64	69	75	78	79	77	76	73	71
Fri	65	57	55	55	55	55	55	55	55	55	55	55	55	55	59	65	69	75	79	79	75	72	67	61
Sat	52	52	52	52	52	52	53	53	52	52	52	52	52	52	52	52	52	56	58	59	58	57	57	56
Sun	55	54	53	52	50	50	49	50	50	50	50	50	50	50	50	50	51	51	53	55	54	53	51	50
Mon	50	51	50	50	50	49	49	49	49	49	49	49	49	49	49	49	49	51	53	54	54	52	51	51
Tue	51	51	51	51	51	51	51	52	52	52	53	53	53	54	54	54	54	54	54	54	53	53	53	53

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	63	60	59	58	58	58	57	56	56	57	56	56	57	59	64	68	73	80	84	84	83	81	78	74
Thu	67	62	61	59	58	56	56	56	56	55	55	55	55	56	60	64	69	75	78	79	77	76	73	71
Fri	65	57	55	55	55	55	55	55	55	55	55	55	55	55	59	65	69	75	79	79	75	72	67	61
Sat	52	52	52	52	52	52	53	53	52	52	52	52	52	52	52	52	52	56	58	59	58	57	57	56
Sun	55	54	53	52	50	50	49	50	50	50	50	50	50	50	50	50	51	51	53	55	54	53	51	50
Mon	50	51	50	50	50	49	49	49	49	49	49	49	49	49	49	49	49	51	53	54	54	52	51	51
Tue	51	51	51	51	51	51	51	52	52	52	53	53	53	54	54	54	54	54	54	54	53	53	53	53

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	63	60	59	58	58	58	57	56	56	57	56	56	57	59	64	68	73	80	84	84	83	81	78	74
Thu	67	62	61	59	58	56	56	56	56	55	55	55	55	56	60	64	69	75	78	79	77	76	73	71
Fri	65	57	55	55	55	55	55	55	55	55	55	55	55	55	59	65	69	75	79	79	75	72	67	61
Sat	52	52	52	52	52	52	53	53	52	52	52	52	52	52	52	52	52	56	58	59	58	57	57	56
Sun	55	54	53	52	50	50	49	50	50	50	50	50	50	50	50	50	51	51	53	55	54	53	51	50
Mon	50	51	50	50	50	49	49	49	49	49	49	49	49	49	49	49	49	51	53	54	54	52	51	51
Tue	51	51	51	51	51	51	51	52	52	52	53	53	53	54	54	54	54	54	54	54	53	53	53	53