20 – 26 Sep 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

65.8Weekly mean modelled AQI · Moderate

Mean PM2.5: 16.9 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+19.7 AQI compared with the previous week’s mean of 46.1.

Highest hourly estimate: 280 in Bangkok · 22 Sept, 21:00 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, 20 Sep	70.5Moderate	36–207	19.2	192 / 192
Thu, 21 Sep	73Moderate	30–198	20.6	192 / 192
Fri, 22 Sep	73.9Moderate	27–280	21.7	192 / 192
Sat, 23 Sep	67.8Moderate	21–254	14.3	192 / 192
Sun, 24 Sep	59.6Moderate	17–176	15.5	192 / 192
Mon, 25 Sep	60.9Moderate	25–195	14.3	192 / 192
Tue, 26 Sep	55Moderate	17–103	13	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	70	68	67	66	67	68	68	69	69	69	69	69	69	69	69	69	70	73	75	76	77	77	77	76
Thu	75	73	71	69	69	69	69	69	69	69	69	69	70	70	70	71	71	74	79	82	83	83	81	77
Fri	74	71	70	69	69	68	67	67	66	66	65	65	65	66	68	71	73	79	85	88	91	92	91	89
Sat	84	79	75	72	69	68	68	67	67	67	67	67	66	66	65	65	64	64	67	67	66	65	63	61
Sun	57	55	55	55	55	55	55	55	56	56	57	57	58	58	59	59	62	66	69	68	68	67	66	64
Mon	61	60	60	60	59	59	59	59	58	58	57	57	57	57	56	56	60	67	71	71	69	67	65	61
Tue	56	55	55	55	55	55	55	55	56	56	56	57	57	57	56	56	55	55	55	54	53	52	52	53

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	130.8Unhealthy for Sensitive Groups	280	42	168 / 168
Pattaya	90.4Moderate	207	24.4	168 / 168
Nakhon Ratchasima	65.3Moderate	103	17.2	168 / 168
Chiang Mai	64.2Moderate	80	16.9	168 / 168
Khon Kaen	63.1Moderate	81	15.1	168 / 168
Chiang Rai	41.3Good	52	7.7	168 / 168
Phuket	39.1Good	57	6.8	168 / 168
Hat Yai	32.3Good	61	5.3	168 / 168

City-hours by category

Good: 504

Moderate: 667

Unhealthy for Sensitive Groups: 85

Unhealthy: 72

Very Unhealthy: 16

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	70	68	67	66	67	68	68	69	69	69	69	69	69	69	69	69	70	73	75	76	77	77	77	76
Thu	75	73	71	69	69	69	69	69	69	69	69	69	70	70	70	71	71	74	79	82	83	83	81	77
Fri	74	71	70	69	69	68	67	67	66	66	65	65	65	66	68	71	73	79	85	88	91	92	91	89
Sat	84	79	75	72	69	68	68	67	67	67	67	67	66	66	65	65	64	64	67	67	66	65	63	61
Sun	57	55	55	55	55	55	55	55	56	56	57	57	58	58	59	59	62	66	69	68	68	67	66	64
Mon	61	60	60	60	59	59	59	59	58	58	57	57	57	57	56	56	60	67	71	71	69	67	65	61
Tue	56	55	55	55	55	55	55	55	56	56	56	57	57	57	56	56	55	55	55	54	53	52	52	53

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	70	68	67	66	67	68	68	69	69	69	69	69	69	69	69	69	70	73	75	76	77	77	77	76
Thu	75	73	71	69	69	69	69	69	69	69	69	69	70	70	70	71	71	74	79	82	83	83	81	77
Fri	74	71	70	69	69	68	67	67	66	66	65	65	65	66	68	71	73	79	85	88	91	92	91	89
Sat	84	79	75	72	69	68	68	67	67	67	67	67	66	66	65	65	64	64	67	67	66	65	63	61
Sun	57	55	55	55	55	55	55	55	56	56	57	57	58	58	59	59	62	66	69	68	68	67	66	64
Mon	61	60	60	60	59	59	59	59	58	58	57	57	57	57	56	56	60	67	71	71	69	67	65	61
Tue	56	55	55	55	55	55	55	55	56	56	56	57	57	57	56	56	55	55	55	54	53	52	52	53

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	70	68	67	66	67	68	68	69	69	69	69	69	69	69	69	69	70	73	75	76	77	77	77	76
Thu	75	73	71	69	69	69	69	69	69	69	69	69	70	70	70	71	71	74	79	82	83	83	81	77
Fri	74	71	70	69	69	68	67	67	66	66	65	65	65	66	68	71	73	79	85	88	91	92	91	89
Sat	84	79	75	72	69	68	68	67	67	67	67	67	66	66	65	65	64	64	67	67	66	65	63	61
Sun	57	55	55	55	55	55	55	55	56	56	57	57	58	58	59	59	62	66	69	68	68	67	66	64
Mon	61	60	60	60	59	59	59	59	58	58	57	57	57	57	56	56	60	67	71	71	69	67	65	61
Tue	56	55	55	55	55	55	55	55	56	56	56	57	57	57	56	56	55	55	55	54	53	52	52	53