Indicator · TLI ind_pm25_annual_mean

PM2.5 Annual Mean Concentration

ค่าเฉลี่ย PM2.5 รายปี (ไมโครกรัม/ลูกบาศก์เมตร)

AS OF 25 OCT 2026µg/m³Weight 1

Source

OpenAQ (Pollution Control Department feed)

Crowd-sourced air-quality aggregator that ingests Thai PCD government sensor feeds and exposes a uniform API. Refresh: daily upstream; TLI re-pulls daily during burning season and weekly otherwise.

Goalposts

The 0-to-100 score for this indicator is normalized against fixed methodology goalposts. The values below define the band; click through to the methodology page for the framework that anchors them.

Score 100: 5µg/m³
Score 0: 50µg/m³
Direction: Lower is better
Anchor: Hybrid: international anchor and Thai distribution · WHO 2021 Air Quality Guidelines

The score-100 floor of 5 µg/m³ is the WHO 2021 annual air-quality guideline. The score-zero ceiling of 50 µg/m³ was re-fit on 2026-04-30 from 35 µg/m³ because Mae Sai already sat at 35.4 µg/m³, leaving no headroom to differentiate the burn-affected northern provinces. The Thai national annual standard of 15 µg/m³, effective 1 June 2023, is shown as a labelled reference line on the methodology page rather than as a goalpost.

Which Thai province leads on PM2.5 Annual Mean Concentration?

Phatthalung leads Thailand on PM2.5 Annual Mean Concentration with a raw value of 11.07 µg/m³, earning a TLI score of 86.5/100. The bottom of the distribution is Mae Hong Son (41.1 µg/m³, score 19.8/100).

Coverage

77 of 77 Thai provinces. Median score: 62.5. Each province's score is normalized 0–100 against fixed goalposts; a higher score is more favorable.

Reading the columns.Raw valuethe actual measurement in µg/m³.Scorenormalized 0–100 against fixed methodology goalposts (not a percentile). Lower is better.

Top scorers

Rank	Province	Raw value (µg/m³)	Score
1	Phatthalung	11.07	86.5
2	Trang	11.22	86.2
3	Si Sa Ket	12.03	84.4
4	Nakhon Si Thammarat	12.09	84.2
5	Narathiwat	12.38	83.6

Lowest scorers

Rank	Province	Raw value (µg/m³)	Score
77	Mae Hong Son	41.1	19.8
76	Lamphun	38.57	25.4
75	Chiang Mai	32.27	39.4
74	Suphan Buri	29.87	44.7
73	Lampang	29.64	45.2

Show all 77 provinces rankedSorted highest to lowest score

Rank	Province	Raw value (µg/m³)	Score
1	Phatthalung	11.07	86.5
2	Trang	11.22	86.2
3	Si Sa Ket	12.03	84.4
4	Nakhon Si Thammarat	12.09	84.2
5	Narathiwat	12.38	83.6
6	Pattani	12.57	83.2
7	Phangnga	12.97	82.3
8	Chumphon	13.24	81.7
9	Yala	13.77	80.5
10	Phuket	13.89	80.3
11	Krabi	14.77	78.3
12	Satun	14.81	78.2
13	Chanthaburi	15.33	77
14	Ranong	15.71	76.2
15	Trat	16.14	75.2
16	Prachuap Khiri Khan	17.14	73
17	Chachoengsao	17.42	72.4
18	Songkhla	17.47	72.3
19	Chaiyaphum	18.17	70.7
20	Nakhon Pathom	18.28	70.5
21	Amnat Charoen	18.28	70.5
22	Samut Songkhram	18.43	70.1
23	Yasothon	18.5	70
24	Nakhon Ratchasima	18.57	69.9
25	Sakon Nakhon	18.69	69.6
26	Rayong	19.21	68.4
27	Buri Ram	19.44	67.9
28	Khon Kaen	19.45	67.9
29	Sa Kaeo	19.45	67.9
30	Mukdahan	20.72	65.1
31	Phetchabun	20.73	65
32	Roi Et	20.78	64.9
33	Kanchanaburi	20.84	64.8
34	Udon Thani	20.95	64.6
35	Chiang Rai	21.03	64.4
36	Phrae	21.13	64.1
37	Samut Sakhon	21.2	64
38	Samut Prakan	21.28	63.8
39	Kamphaeng Phet	21.87	62.5
40	Phichit	22.1	62
41	Maha Sarakham	22.27	61.6
42	Chon Buri	22.4	61.3
43	Bueng Kan	22.61	60.9
44	Nonthaburi	22.64	60.8
45	Bangkok	22.7	60.7
46	Nakhon Sawan	23.04	59.9
47	Sukhothai	23.64	58.6
48	Ang Thong	23.65	58.6
49	Sing Buri	23.72	58.4
50	Nong Bua Lam Phu	23.88	58
51	Tak	24.25	57.2
52	Pathum Thani	24.39	56.9
53	Ubon Ratchathani	24.6	56.4
54	Nakhon Phanom	24.72	56.2
55	Nong Khai	24.96	55.7
56	Phayao	25.03	55.5
57	Surat Thani	25.21	55.1
58	Loei	25.49	54.5
59	Kalasin	25.69	54
60	Phra Nakhon Si Ayutthaya	25.74	53.9
61	Uttaradit	25.79	53.8
62	Phetchaburi	25.93	53.5
63	Ratchaburi	26.3	52.7
64	Phitsanulok	26.48	52.3
65	Nakhon Nayok	26.56	52.1
66	Prachin Buri	26.8	51.5
67	Chai Nat	26.94	51.2
68	Lopburi	27.09	50.9
69	Surin	27.79	49.4
70	Uthai Thani	28.59	47.6
71	Nan	28.99	46.7
72	Saraburi	29.51	45.5
73	Lampang	29.64	45.2
74	Suphan Buri	29.87	44.7
75	Chiang Mai	32.27	39.4
76	Lamphun	38.57	25.4
77	Mae Hong Son	41.1	19.8

Methodology

See the methodology page for the full TLI scoring approach, including how this indicator's category Environment & Climate combines with the other six categories via geometric mean.

Cite as: "PM2.5 Annual Mean Concentration." Thailand Livability Index, 2026. CC BY-NC 4.0.

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