26 Apr – 2 May 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

81.6Weekly mean modelled AQI · Moderate

Mean PM2.5: 22.7 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-9.1 AQI compared with the previous week’s mean of 90.7.

Highest hourly estimate: 300 in Bangkok · 27 Apr, 23:00 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, 26 Apr	73.4Moderate	51–100	21	192 / 192
Thu, 27 Apr	85.8Moderate	51–300	29.7	192 / 192
Fri, 28 Apr	92.7Moderate	57–277	27	192 / 192
Sat, 29 Apr	86.1Moderate	57–189	23.9	192 / 192
Sun, 30 Apr	80.4Moderate	52–210	20.8	192 / 192
Mon, 1 May	80.1Moderate	50–270	19.8	192 / 192
Tue, 2 May	72.6Moderate	43–207	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	77	77	76	76	76	75	75	74	74	74	74	73	73	73	73	72	72	72	71	71	71	72	72	72
Thu	72	73	74	75	76	78	79	80	80	80	81	81	87	91	93	95	100	106	96	91	90	89	88	104
Fri	101	98	95	93	90	88	88	88	88	88	88	88	88	88	88	90	95	100	102	101	99	97	93	91
Sat	88	84	83	83	81	80	79	78	78	78	78	78	79	82	84	88	97	103	105	104	99	93	86	80
Sun	78	78	78	78	78	78	78	78	78	77	77	76	76	76	77	80	84	89	91	92	90	87	81	74
Mon	72	72	72	72	72	72	72	72	72	72	72	75	79	82	83	86	89	91	93	93	92	91	88	86
Tue	83	78	73	70	70	70	69	69	69	69	68	68	68	68	72	76	79	80	81	80	77	74	69	65

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	146.4Unhealthy for Sensitive Groups	300	43.4	168 / 168
Chiang Rai	85.4Moderate	95	27.5	168 / 168
Chiang Mai	83.7Moderate	105	26	168 / 168
Nakhon Ratchasima	81.4Moderate	147	23.9	168 / 168
Khon Kaen	75Moderate	168	19.5	168 / 168
Pattaya	65.7Moderate	104	16.4	168 / 168
Phuket	59.8Moderate	70	13.9	168 / 168
Hat Yai	55.1Moderate	67	11.5	168 / 168

City-hours by category

Good: 33

Moderate: 1173

Unhealthy for Sensitive Groups: 62

Unhealthy: 42

Very Unhealthy: 34

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	77	77	76	76	76	75	75	74	74	74	74	73	73	73	73	72	72	72	71	71	71	72	72	72
Thu	72	73	74	75	76	78	79	80	80	80	81	81	87	91	93	95	100	106	96	91	90	89	88	104
Fri	101	98	95	93	90	88	88	88	88	88	88	88	88	88	88	90	95	100	102	101	99	97	93	91
Sat	88	84	83	83	81	80	79	78	78	78	78	78	79	82	84	88	97	103	105	104	99	93	86	80
Sun	78	78	78	78	78	78	78	78	78	77	77	76	76	76	77	80	84	89	91	92	90	87	81	74
Mon	72	72	72	72	72	72	72	72	72	72	72	75	79	82	83	86	89	91	93	93	92	91	88	86
Tue	83	78	73	70	70	70	69	69	69	69	68	68	68	68	72	76	79	80	81	80	77	74	69	65

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	77	77	76	76	76	75	75	74	74	74	74	73	73	73	73	72	72	72	71	71	71	72	72	72
Thu	72	73	74	75	76	78	79	80	80	80	81	81	87	91	93	95	100	106	96	91	90	89	88	104
Fri	101	98	95	93	90	88	88	88	88	88	88	88	88	88	88	90	95	100	102	101	99	97	93	91
Sat	88	84	83	83	81	80	79	78	78	78	78	78	79	82	84	88	97	103	105	104	99	93	86	80
Sun	78	78	78	78	78	78	78	78	78	77	77	76	76	76	77	80	84	89	91	92	90	87	81	74
Mon	72	72	72	72	72	72	72	72	72	72	72	75	79	82	83	86	89	91	93	93	92	91	88	86
Tue	83	78	73	70	70	70	69	69	69	69	68	68	68	68	72	76	79	80	81	80	77	74	69	65

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	77	77	76	76	76	75	75	74	74	74	74	73	73	73	73	72	72	72	71	71	71	72	72	72
Thu	72	73	74	75	76	78	79	80	80	80	81	81	87	91	93	95	100	106	96	91	90	89	88	104
Fri	101	98	95	93	90	88	88	88	88	88	88	88	88	88	88	90	95	100	102	101	99	97	93	91
Sat	88	84	83	83	81	80	79	78	78	78	78	78	79	82	84	88	97	103	105	104	99	93	86	80
Sun	78	78	78	78	78	78	78	78	78	77	77	76	76	76	77	80	84	89	91	92	90	87	81	74
Mon	72	72	72	72	72	72	72	72	72	72	72	75	79	82	83	86	89	91	93	93	92	91	88	86
Tue	83	78	73	70	70	70	69	69	69	69	68	68	68	68	72	76	79	80	81	80	77	74	69	65