16 – 22 Apr 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

66.5Weekly mean modelled AQI · Moderate

Mean PM2.5: 17 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-13.5 AQI compared with the previous week’s mean of 80.

Highest hourly estimate: 201 in Khon Kaen · 16 Apr, 18:00 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, 16 Apr	80.5Moderate	28–201	19.9	192 / 192
Thu, 17 Apr	65.2Moderate	22–147	14.3	192 / 192
Fri, 18 Apr	60.3Moderate	20–118	13.1	192 / 192
Sat, 19 Apr	64.4Moderate	22–139	18.4	192 / 192
Sun, 20 Apr	68.1Moderate	20–154	19.2	192 / 192
Mon, 21 Apr	63.5Moderate	23–126	16.6	192 / 192
Tue, 22 Apr	63.4Moderate	28–112	17.1	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	83	83	83	82	82	81	81	81	81	80	79	78	77	76	75	79	82	86	88	87	83	79	75	71
Thu	69	68	67	66	65	64	63	62	61	61	60	60	60	61	63	66	71	75	76	73	69	64	61	58
Fri	57	57	57	57	57	58	58	58	58	58	57	57	57	58	59	61	66	71	72	70	66	62	60	58
Sat	57	56	56	57	57	58	59	60	61	61	62	62	63	63	64	67	72	77	80	78	75	70	66	66
Sun	66	65	66	65	65	65	65	65	66	66	66	67	67	67	67	68	72	76	78	76	72	70	69	67
Mon	67	66	66	65	64	64	63	62	61	60	60	60	61	61	62	62	64	68	69	67	64	64	64	63
Tue	64	63	63	63	63	63	63	62	62	62	62	62	63	63	63	63	65	66	67	66	64	64	64	64

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
Khon Kaen	100.8Unhealthy for Sensitive Groups	201	30.6	168 / 168
Nakhon Ratchasima	83.4Moderate	118	24.9	168 / 168
Chiang Rai	76.3Moderate	117	21.4	168 / 168
Bangkok	73.9Moderate	147	16.2	168 / 168
Chiang Mai	72.5Moderate	88	20.6	168 / 168
Hat Yai	50.2Moderate	61	9.7	168 / 168
Pattaya	47Good	80	8.3	168 / 168
Phuket	27.9Good	40	4	168 / 168

City-hours by category

Good: 361

Moderate: 858

Unhealthy for Sensitive Groups: 117

Unhealthy: 7

Very Unhealthy: 1

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	83	83	83	82	82	81	81	81	81	80	79	78	77	76	75	79	82	86	88	87	83	79	75	71
Thu	69	68	67	66	65	64	63	62	61	61	60	60	60	61	63	66	71	75	76	73	69	64	61	58
Fri	57	57	57	57	57	58	58	58	58	58	57	57	57	58	59	61	66	71	72	70	66	62	60	58
Sat	57	56	56	57	57	58	59	60	61	61	62	62	63	63	64	67	72	77	80	78	75	70	66	66
Sun	66	65	66	65	65	65	65	65	66	66	66	67	67	67	67	68	72	76	78	76	72	70	69	67
Mon	67	66	66	65	64	64	63	62	61	60	60	60	61	61	62	62	64	68	69	67	64	64	64	63
Tue	64	63	63	63	63	63	63	62	62	62	62	62	63	63	63	63	65	66	67	66	64	64	64	64

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	83	83	83	82	82	81	81	81	81	80	79	78	77	76	75	79	82	86	88	87	83	79	75	71
Thu	69	68	67	66	65	64	63	62	61	61	60	60	60	61	63	66	71	75	76	73	69	64	61	58
Fri	57	57	57	57	57	58	58	58	58	58	57	57	57	58	59	61	66	71	72	70	66	62	60	58
Sat	57	56	56	57	57	58	59	60	61	61	62	62	63	63	64	67	72	77	80	78	75	70	66	66
Sun	66	65	66	65	65	65	65	65	66	66	66	67	67	67	67	68	72	76	78	76	72	70	69	67
Mon	67	66	66	65	64	64	63	62	61	60	60	60	61	61	62	62	64	68	69	67	64	64	64	63
Tue	64	63	63	63	63	63	63	62	62	62	62	62	63	63	63	63	65	66	67	66	64	64	64	64

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	83	83	83	82	82	81	81	81	81	80	79	78	77	76	75	79	82	86	88	87	83	79	75	71
Thu	69	68	67	66	65	64	63	62	61	61	60	60	60	61	63	66	71	75	76	73	69	64	61	58
Fri	57	57	57	57	57	58	58	58	58	58	57	57	57	58	59	61	66	71	72	70	66	62	60	58
Sat	57	56	56	57	57	58	59	60	61	61	62	62	63	63	64	67	72	77	80	78	75	70	66	66
Sun	66	65	66	65	65	65	65	65	66	66	66	67	67	67	67	68	72	76	78	76	72	70	69	67
Mon	67	66	66	65	64	64	63	62	61	60	60	60	61	61	62	62	64	68	69	67	64	64	64	63
Tue	64	63	63	63	63	63	63	62	62	62	62	62	63	63	63	63	65	66	67	66	64	64	64	64