15 – 21 May 2024 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

60.8Weekly mean modelled AQI · Moderate

Mean PM2.5: 14.2 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-12.9 AQI compared with the previous week’s mean of 73.7.

Highest hourly estimate: 222 in Bangkok · 15 May, 00:00 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, 15 May	82.9Moderate	51–222	21.3	192 / 192
Thu, 16 May	67Moderate	42–144	15.7	192 / 192
Fri, 17 May	60.9Moderate	35–84	12.7	192 / 192
Sat, 18 May	51.4Moderate	27–101	10.8	192 / 192
Sun, 19 May	51.2Moderate	25–73	12.1	192 / 192
Mon, 20 May	55.8Moderate	23–87	14.9	192 / 192
Tue, 21 May	56.5Moderate	23–84	11.9	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	92	90	86	82	81	81	80	79	78	78	78	79	79	79	82	85	88	91	92	89	85	81	77	76
Thu	75	73	72	71	70	69	69	68	68	67	66	65	65	65	64	63	66	68	68	67	64	62	62	62
Fri	62	62	62	62	62	62	62	62	62	62	61	61	61	61	61	61	61	61	62	61	60	58	57	56
Sat	55	54	53	53	52	52	51	51	51	50	50	50	49	50	50	50	52	54	55	54	52	50	49	49
Sun	49	49	49	49	49	49	50	50	50	51	51	51	52	52	52	52	53	53	54	53	53	53	53	53
Mon	53	53	54	54	54	55	55	55	55	55	56	56	56	56	56	56	57	58	58	58	58	58	58	58
Tue	58	58	58	58	58	58	58	58	58	58	57	57	56	56	56	56	56	57	57	55	54	54	53	52

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	80.6Moderate	222	19.3	168 / 168
Chiang Mai	71Moderate	132	19.1	168 / 168
Nakhon Ratchasima	70.5Moderate	113	18.5	168 / 168
Chiang Rai	65.9Moderate	83	17.5	168 / 168
Khon Kaen	60.9Moderate	101	13.8	168 / 168
Pattaya	52Moderate	133	9.3	168 / 168
Hat Yai	43.7Good	57	7.6	168 / 168
Phuket	41.9Good	65	8.4	168 / 168

City-hours by category

Good: 359

Moderate: 936

Unhealthy for Sensitive Groups: 26

Unhealthy: 15

Very Unhealthy: 8

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	92	90	86	82	81	81	80	79	78	78	78	79	79	79	82	85	88	91	92	89	85	81	77	76
Thu	75	73	72	71	70	69	69	68	68	67	66	65	65	65	64	63	66	68	68	67	64	62	62	62
Fri	62	62	62	62	62	62	62	62	62	62	61	61	61	61	61	61	61	61	62	61	60	58	57	56
Sat	55	54	53	53	52	52	51	51	51	50	50	50	49	50	50	50	52	54	55	54	52	50	49	49
Sun	49	49	49	49	49	49	50	50	50	51	51	51	52	52	52	52	53	53	54	53	53	53	53	53
Mon	53	53	54	54	54	55	55	55	55	55	56	56	56	56	56	56	57	58	58	58	58	58	58	58
Tue	58	58	58	58	58	58	58	58	58	58	57	57	56	56	56	56	56	57	57	55	54	54	53	52

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	92	90	86	82	81	81	80	79	78	78	78	79	79	79	82	85	88	91	92	89	85	81	77	76
Thu	75	73	72	71	70	69	69	68	68	67	66	65	65	65	64	63	66	68	68	67	64	62	62	62
Fri	62	62	62	62	62	62	62	62	62	62	61	61	61	61	61	61	61	61	62	61	60	58	57	56
Sat	55	54	53	53	52	52	51	51	51	50	50	50	49	50	50	50	52	54	55	54	52	50	49	49
Sun	49	49	49	49	49	49	50	50	50	51	51	51	52	52	52	52	53	53	54	53	53	53	53	53
Mon	53	53	54	54	54	55	55	55	55	55	56	56	56	56	56	56	57	58	58	58	58	58	58	58
Tue	58	58	58	58	58	58	58	58	58	58	57	57	56	56	56	56	56	57	57	55	54	54	53	52

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	92	90	86	82	81	81	80	79	78	78	78	79	79	79	82	85	88	91	92	89	85	81	77	76
Thu	75	73	72	71	70	69	69	68	68	67	66	65	65	65	64	63	66	68	68	67	64	62	62	62
Fri	62	62	62	62	62	62	62	62	62	62	61	61	61	61	61	61	61	61	62	61	60	58	57	56
Sat	55	54	53	53	52	52	51	51	51	50	50	50	49	50	50	50	52	54	55	54	52	50	49	49
Sun	49	49	49	49	49	49	50	50	50	51	51	51	52	52	52	52	53	53	54	53	53	53	53	53
Mon	53	53	54	54	54	55	55	55	55	55	56	56	56	56	56	56	57	58	58	58	58	58	58	58
Tue	58	58	58	58	58	58	58	58	58	58	57	57	56	56	56	56	56	57	57	55	54	54	53	52