1 – 7 Feb 2023 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

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

102.9Weekly mean modelled AQI · Unhealthy for Sensitive Groups

Mean PM2.5: 36.9 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

+11 AQI compared with the previous week’s mean of 91.9.

Highest hourly estimate: 347 in Bangkok · 2 Feb, 18:00 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, 1 Feb	129.1Unhealthy for Sensitive Groups	57–282	62	192 / 192
Thu, 2 Feb	144.4Unhealthy for Sensitive Groups	64–347	66.1	192 / 192
Fri, 3 Feb	120.7Unhealthy for Sensitive Groups	50–318	31.3	192 / 192
Sat, 4 Feb	86.3Moderate	38–271	31.2	192 / 192
Sun, 5 Feb	83.2Moderate	37–280	24.3	192 / 192
Mon, 6 Feb	79.8Moderate	36–230	22.4	192 / 192
Tue, 7 Feb	76.4Moderate	43–154	20.9	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	126	125	124	125	123	121	119	117	115	114	115	116	117	118	124	132	141	150	149	150	149	147	144	141
Thu	139	138	137	137	137	137	136	137	136	137	138	139	141	143	148	155	157	161	161	161	157	152	144	139
Fri	135	132	131	144	140	137	134	131	126	121	119	117	114	112	112	113	115	117	117	113	110	107	103	97
Sat	92	87	86	85	85	84	84	83	83	83	83	83	84	89	91	92	94	91	87	89	86	84	84	84
Sun	84	95	91	87	84	84	84	84	83	83	83	83	83	82	82	82	81	81	81	81	83	82	80	78
Mon	77	77	77	77	77	77	77	77	78	78	78	78	78	78	78	78	79	84	86	87	87	87	85	82
Tue	76	75	75	75	74	74	73	73	73	72	72	73	73	72	73	77	85	90	92	86	81	76	72	72

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	213.9Very Unhealthy	347	114.2	168 / 168
Pattaya	127.5Unhealthy for Sensitive Groups	281	40.8	168 / 168
Chiang Mai	102.7Unhealthy for Sensitive Groups	202	30.2	168 / 168
Chiang Rai	91.3Moderate	163	27	168 / 168
Khon Kaen	89.5Moderate	135	29.4	168 / 168
Nakhon Ratchasima	86.3Moderate	151	28.3	168 / 168
Hat Yai	58.9Moderate	76	13.2	168 / 168
Phuket	52.8Moderate	76	11.9	168 / 168

City-hours by category

Good: 106

Moderate: 809

Unhealthy for Sensitive Groups: 196

Unhealthy: 103

Very Unhealthy: 111

Hazardous: 19

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	126	125	124	125	123	121	119	117	115	114	115	116	117	118	124	132	141	150	149	150	149	147	144	141
Thu	139	138	137	137	137	137	136	137	136	137	138	139	141	143	148	155	157	161	161	161	157	152	144	139
Fri	135	132	131	144	140	137	134	131	126	121	119	117	114	112	112	113	115	117	117	113	110	107	103	97
Sat	92	87	86	85	85	84	84	83	83	83	83	83	84	89	91	92	94	91	87	89	86	84	84	84
Sun	84	95	91	87	84	84	84	84	83	83	83	83	83	82	82	82	81	81	81	81	83	82	80	78
Mon	77	77	77	77	77	77	77	77	78	78	78	78	78	78	78	78	79	84	86	87	87	87	85	82
Tue	76	75	75	75	74	74	73	73	73	72	72	73	73	72	73	77	85	90	92	86	81	76	72	72

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	126	125	124	125	123	121	119	117	115	114	115	116	117	118	124	132	141	150	149	150	149	147	144	141
Thu	139	138	137	137	137	137	136	137	136	137	138	139	141	143	148	155	157	161	161	161	157	152	144	139
Fri	135	132	131	144	140	137	134	131	126	121	119	117	114	112	112	113	115	117	117	113	110	107	103	97
Sat	92	87	86	85	85	84	84	83	83	83	83	83	84	89	91	92	94	91	87	89	86	84	84	84
Sun	84	95	91	87	84	84	84	84	83	83	83	83	83	82	82	82	81	81	81	81	83	82	80	78
Mon	77	77	77	77	77	77	77	77	78	78	78	78	78	78	78	78	79	84	86	87	87	87	85	82
Tue	76	75	75	75	74	74	73	73	73	72	72	73	73	72	73	77	85	90	92	86	81	76	72	72

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	126	125	124	125	123	121	119	117	115	114	115	116	117	118	124	132	141	150	149	150	149	147	144	141
Thu	139	138	137	137	137	137	136	137	136	137	138	139	141	143	148	155	157	161	161	161	157	152	144	139
Fri	135	132	131	144	140	137	134	131	126	121	119	117	114	112	112	113	115	117	117	113	110	107	103	97
Sat	92	87	86	85	85	84	84	83	83	83	83	83	84	89	91	92	94	91	87	89	86	84	84	84
Sun	84	95	91	87	84	84	84	84	83	83	83	83	83	82	82	82	81	81	81	81	83	82	80	78
Mon	77	77	77	77	77	77	77	77	78	78	78	78	78	78	78	78	79	84	86	87	87	87	85	82
Tue	76	75	75	75	74	74	73	73	73	72	72	73	73	72	73	77	85	90	92	86	81	76	72	72