14 – 20 Dec 2022 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

59.4Weekly mean modelled AQI · Moderate

Mean PM2.5: 15.6 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-17.6 AQI compared with the previous week’s mean of 77.

Highest hourly estimate: 231 in Bangkok · 16 Dec, 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, 14 Dec	37.8Good	11–84	0.8	192 / 192
Thu, 15 Dec	14.9Good	12–17	0.7	192 / 192
Fri, 16 Dec	52.6Moderate	15–231	22.5	192 / 192
Sat, 17 Dec	85.9Moderate	40–207	21.5	192 / 192
Sun, 18 Dec	72.2Moderate	38–198	17.8	192 / 192
Mon, 19 Dec	72.1Moderate	45–203	19	192 / 192
Tue, 20 Dec	80.1Moderate	44–219	26.6	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	63	62	60	59	58	56	55	53	51	49	47	44	40	36	32	26	21	16	13	13	13	13	13	14
Thu	14	14	14	14	14	14	15	15	15	15	15	15	15	15	15	15	15	15	16	16	16	16	16	16
Fri	16	16	16	16	16	16	16	19	21	25	31	36	40	47	62	79	90	95	102	104	104	102	99	95
Sat	89	86	84	82	83	85	86	88	87	86	86	86	85	85	85	85	85	89	92	92	91	86	82	78
Sun	75	72	71	70	69	69	69	68	68	67	67	66	66	66	66	70	76	80	83	84	83	81	77	72
Mon	69	69	68	67	67	66	66	66	66	65	65	65	65	66	69	70	72	83	90	92	90	85	80	74
Tue	71	69	70	70	71	72	72	73	74	74	75	76	76	77	80	85	88	90	90	95	92	95	95	92

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	99.2Moderate	231	34.3	168 / 168
Chiang Mai	75.1Moderate	219	21.9	168 / 168
Pattaya	63.3Moderate	205	14.4	168 / 168
Khon Kaen	54.9Moderate	84	14	168 / 168
Chiang Rai	52.1Moderate	82	13.5	168 / 168
Nakhon Ratchasima	50.5Moderate	88	11.8	168 / 168
Hat Yai	44.4Good	60	8.9	168 / 168
Phuket	35.4Good	54	5.8	168 / 168

City-hours by category

Good: 533

Moderate: 674

Unhealthy for Sensitive Groups: 73

Unhealthy: 47

Very Unhealthy: 17

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	63	62	60	59	58	56	55	53	51	49	47	44	40	36	32	26	21	16	13	13	13	13	13	14
Thu	14	14	14	14	14	14	15	15	15	15	15	15	15	15	15	15	15	15	16	16	16	16	16	16
Fri	16	16	16	16	16	16	16	19	21	25	31	36	40	47	62	79	90	95	102	104	104	102	99	95
Sat	89	86	84	82	83	85	86	88	87	86	86	86	85	85	85	85	85	89	92	92	91	86	82	78
Sun	75	72	71	70	69	69	69	68	68	67	67	66	66	66	66	70	76	80	83	84	83	81	77	72
Mon	69	69	68	67	67	66	66	66	66	65	65	65	65	66	69	70	72	83	90	92	90	85	80	74
Tue	71	69	70	70	71	72	72	73	74	74	75	76	76	77	80	85	88	90	90	95	92	95	95	92

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	63	62	60	59	58	56	55	53	51	49	47	44	40	36	32	26	21	16	13	13	13	13	13	14
Thu	14	14	14	14	14	14	15	15	15	15	15	15	15	15	15	15	15	15	16	16	16	16	16	16
Fri	16	16	16	16	16	16	16	19	21	25	31	36	40	47	62	79	90	95	102	104	104	102	99	95
Sat	89	86	84	82	83	85	86	88	87	86	86	86	85	85	85	85	85	89	92	92	91	86	82	78
Sun	75	72	71	70	69	69	69	68	68	67	67	66	66	66	66	70	76	80	83	84	83	81	77	72
Mon	69	69	68	67	67	66	66	66	66	65	65	65	65	66	69	70	72	83	90	92	90	85	80	74
Tue	71	69	70	70	71	72	72	73	74	74	75	76	76	77	80	85	88	90	90	95	92	95	95	92

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	63	62	60	59	58	56	55	53	51	49	47	44	40	36	32	26	21	16	13	13	13	13	13	14
Thu	14	14	14	14	14	14	15	15	15	15	15	15	15	15	15	15	15	15	16	16	16	16	16	16
Fri	16	16	16	16	16	16	16	19	21	25	31	36	40	47	62	79	90	95	102	104	104	102	99	95
Sat	89	86	84	82	83	85	86	88	87	86	86	86	85	85	85	85	85	89	92	92	91	86	82	78
Sun	75	72	71	70	69	69	69	68	68	67	67	66	66	66	66	70	76	80	83	84	83	81	77	72
Mon	69	69	68	67	67	66	66	66	66	65	65	65	65	66	69	70	72	83	90	92	90	85	80	74
Tue	71	69	70	70	71	72	72	73	74	74	75	76	76	77	80	85	88	90	90	95	92	95	95	92