9 – 15 Apr 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

80Weekly mean modelled AQI · Moderate

Mean PM2.5: 23.8 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-12.4 AQI compared with the previous week’s mean of 92.4.

Highest hourly estimate: 189 in Bangkok · 15 Apr, 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, 9 Apr	90.2Moderate	51–182	29.5	192 / 192
Thu, 10 Apr	91.4Moderate	40–164	29.1	192 / 192
Fri, 11 Apr	91Moderate	29–175	26.9	192 / 192
Sat, 12 Apr	68.3Moderate	29–119	14.5	192 / 192
Sun, 13 Apr	66.6Moderate	25–168	19.4	192 / 192
Mon, 14 Apr	70.5Moderate	23–120	20.8	192 / 192
Tue, 15 Apr	82.1Moderate	33–189	26.8	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	81	82	84	84	86	87	89	90	91	91	91	91	91	91	91	91	93	98	99	95	93	92	92	92
Thu	92	91	91	90	89	88	87	86	86	87	87	88	88	89	89	89	95	100	103	102	100	97	93	90
Fri	89	89	89	89	89	89	89	89	88	88	88	88	88	88	88	92	98	102	104	102	97	90	87	84
Sat	83	82	81	80	78	77	76	74	73	71	70	68	67	65	64	63	62	61	59	59	58	57	57	56
Sun	56	57	57	58	59	60	60	60	61	61	61	61	62	62	63	68	74	81	85	86	84	79	74	70
Mon	68	68	68	68	68	67	67	67	67	68	68	69	69	70	71	72	74	77	78	78	76	73	72	71
Tue	72	72	72	73	74	75	76	77	78	78	79	80	80	81	81	82	88	95	99	97	95	91	89	86

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	108Unhealthy for Sensitive Groups	182	34.3	168 / 168
Nakhon Ratchasima	103.2Unhealthy for Sensitive Groups	148	36.1	168 / 168
Chiang Rai	101.3Unhealthy for Sensitive Groups	132	35.6	168 / 168
Chiang Mai	94.1Moderate	150	30.9	168 / 168
Bangkok	87.2Moderate	189	24.9	168 / 168
Pattaya	56.5Moderate	86	12.3	168 / 168
Hat Yai	51Moderate	68	10.1	168 / 168
Phuket	38.7Good	58	6.7	168 / 168

City-hours by category

Good: 208

Moderate: 778

Unhealthy for Sensitive Groups: 324

Unhealthy: 34

Very Unhealthy: 0

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	81	82	84	84	86	87	89	90	91	91	91	91	91	91	91	91	93	98	99	95	93	92	92	92
Thu	92	91	91	90	89	88	87	86	86	87	87	88	88	89	89	89	95	100	103	102	100	97	93	90
Fri	89	89	89	89	89	89	89	89	88	88	88	88	88	88	88	92	98	102	104	102	97	90	87	84
Sat	83	82	81	80	78	77	76	74	73	71	70	68	67	65	64	63	62	61	59	59	58	57	57	56
Sun	56	57	57	58	59	60	60	60	61	61	61	61	62	62	63	68	74	81	85	86	84	79	74	70
Mon	68	68	68	68	68	67	67	67	67	68	68	69	69	70	71	72	74	77	78	78	76	73	72	71
Tue	72	72	72	73	74	75	76	77	78	78	79	80	80	81	81	82	88	95	99	97	95	91	89	86

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	81	82	84	84	86	87	89	90	91	91	91	91	91	91	91	91	93	98	99	95	93	92	92	92
Thu	92	91	91	90	89	88	87	86	86	87	87	88	88	89	89	89	95	100	103	102	100	97	93	90
Fri	89	89	89	89	89	89	89	89	88	88	88	88	88	88	88	92	98	102	104	102	97	90	87	84
Sat	83	82	81	80	78	77	76	74	73	71	70	68	67	65	64	63	62	61	59	59	58	57	57	56
Sun	56	57	57	58	59	60	60	60	61	61	61	61	62	62	63	68	74	81	85	86	84	79	74	70
Mon	68	68	68	68	68	67	67	67	67	68	68	69	69	70	71	72	74	77	78	78	76	73	72	71
Tue	72	72	72	73	74	75	76	77	78	78	79	80	80	81	81	82	88	95	99	97	95	91	89	86

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	81	82	84	84	86	87	89	90	91	91	91	91	91	91	91	91	93	98	99	95	93	92	92	92
Thu	92	91	91	90	89	88	87	86	86	87	87	88	88	89	89	89	95	100	103	102	100	97	93	90
Fri	89	89	89	89	89	89	89	89	88	88	88	88	88	88	88	92	98	102	104	102	97	90	87	84
Sat	83	82	81	80	78	77	76	74	73	71	70	68	67	65	64	63	62	61	59	59	58	57	57	56
Sun	56	57	57	58	59	60	60	60	61	61	61	61	62	62	63	68	74	81	85	86	84	79	74	70
Mon	68	68	68	68	68	67	67	67	67	68	68	69	69	70	71	72	74	77	78	78	76	73	72	71
Tue	72	72	72	73	74	75	76	77	78	78	79	80	80	81	81	82	88	95	99	97	95	91	89	86