3 – 9 May 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

73.1Weekly mean modelled AQI · Moderate

Mean PM2.5: 18.3 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-8.5 AQI compared with the previous week’s mean of 81.6.

Highest hourly estimate: 300 in Bangkok · 7 May, 20:00 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, 3 May	64.4Moderate	37–90	17.5	192 / 192
Thu, 4 May	69Moderate	37–141	16.6	192 / 192
Fri, 5 May	74.9Moderate	28–228	18.7	192 / 192
Sat, 6 May	79.3Moderate	28–260	19.5	192 / 192
Sun, 7 May	77.5Moderate	31–300	17.4	192 / 192
Mon, 8 May	74.4Moderate	30–243	19.8	192 / 192
Tue, 9 May	72Moderate	38–153	18.6	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	65	65	64	64	64	64	64	63	64	64	64	65	65	65	64	64	64	66	67	65	64	64	64	64
Thu	64	65	65	65	65	65	65	65	65	65	65	65	65	65	65	70	75	80	83	81	77	74	72	70
Fri	68	66	66	66	66	66	67	67	67	67	67	68	68	73	75	78	82	86	89	91	91	91	90	85
Sat	79	75	75	75	74	73	72	70	70	70	70	70	70	75	79	84	86	90	93	94	93	92	88	85
Sun	82	74	73	74	74	73	72	70	67	66	66	67	67	74	80	83	85	86	89	91	90	89	87	85
Mon	81	74	71	72	72	71	70	67	65	65	65	65	65	69	73	75	78	82	84	85	86	86	84	82
Tue	76	70	69	69	70	70	70	70	70	70	71	71	71	71	71	71	72	75	79	80	78	75	71	70

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	124.7Unhealthy for Sensitive Groups	300	30.2	168 / 168
Khon Kaen	87.5Moderate	141	22.8	168 / 168
Nakhon Ratchasima	80.3Moderate	136	19.9	168 / 168
Chiang Rai	76.8Moderate	90	23	168 / 168
Chiang Mai	73.5Moderate	87	21.3	168 / 168
Pattaya	55.5Moderate	70	12.1	168 / 168
Hat Yai	49.8Good	83	10.3	168 / 168
Phuket	36.4Good	45	6.6	168 / 168

City-hours by category

Good: 267

Moderate: 915

Unhealthy for Sensitive Groups: 118

Unhealthy: 12

Very Unhealthy: 32

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	65	65	64	64	64	64	64	63	64	64	64	65	65	65	64	64	64	66	67	65	64	64	64	64
Thu	64	65	65	65	65	65	65	65	65	65	65	65	65	65	65	70	75	80	83	81	77	74	72	70
Fri	68	66	66	66	66	66	67	67	67	67	67	68	68	73	75	78	82	86	89	91	91	91	90	85
Sat	79	75	75	75	74	73	72	70	70	70	70	70	70	75	79	84	86	90	93	94	93	92	88	85
Sun	82	74	73	74	74	73	72	70	67	66	66	67	67	74	80	83	85	86	89	91	90	89	87	85
Mon	81	74	71	72	72	71	70	67	65	65	65	65	65	69	73	75	78	82	84	85	86	86	84	82
Tue	76	70	69	69	70	70	70	70	70	70	71	71	71	71	71	71	72	75	79	80	78	75	71	70

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	65	65	64	64	64	64	64	63	64	64	64	65	65	65	64	64	64	66	67	65	64	64	64	64
Thu	64	65	65	65	65	65	65	65	65	65	65	65	65	65	65	70	75	80	83	81	77	74	72	70
Fri	68	66	66	66	66	66	67	67	67	67	67	68	68	73	75	78	82	86	89	91	91	91	90	85
Sat	79	75	75	75	74	73	72	70	70	70	70	70	70	75	79	84	86	90	93	94	93	92	88	85
Sun	82	74	73	74	74	73	72	70	67	66	66	67	67	74	80	83	85	86	89	91	90	89	87	85
Mon	81	74	71	72	72	71	70	67	65	65	65	65	65	69	73	75	78	82	84	85	86	86	84	82
Tue	76	70	69	69	70	70	70	70	70	70	71	71	71	71	71	71	72	75	79	80	78	75	71	70

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	65	65	64	64	64	64	64	63	64	64	64	65	65	65	64	64	64	66	67	65	64	64	64	64
Thu	64	65	65	65	65	65	65	65	65	65	65	65	65	65	65	70	75	80	83	81	77	74	72	70
Fri	68	66	66	66	66	66	67	67	67	67	67	68	68	73	75	78	82	86	89	91	91	91	90	85
Sat	79	75	75	75	74	73	72	70	70	70	70	70	70	75	79	84	86	90	93	94	93	92	88	85
Sun	82	74	73	74	74	73	72	70	67	66	66	67	67	74	80	83	85	86	89	91	90	89	87	85
Mon	81	74	71	72	72	71	70	67	65	65	65	65	65	69	73	75	78	82	84	85	86	86	84	82
Tue	76	70	69	69	70	70	70	70	70	70	71	71	71	71	71	71	72	75	79	80	78	75	71	70