Indicator · TLI ind_pm25_annual_mean

PM2.5 Annual Mean Concentration

ค่าเฉลี่ย PM2.5 รายปี (ไมโครกรัม/ลูกบาศก์เมตร)

AS OF 18 MAY 2026 µg/m³ Weight 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: 5 µg/m³
Score 0: 50 µg/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.

Live distribution: 3 of 77 clip at the score-0 floor.

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

Phatthalung leads Thailand on PM2.5 Annual Mean Concentration with a raw value of 11.92 µg/m³, earning a TLI score of 84.6/100. The bottom of the distribution is Lamphun (77.33 µg/m³, score 0/100).

Coverage

77 of 77 Thai provinces. Median score: 44.6. Each province's score is normalized 0–100 against fixed goalposts; a higher score is more favorable.

Reading the columns. Raw value the actual measurement in µg/m³. Score normalized 0–100 against fixed methodology goalposts (not a percentile). Lower is better. Why ties? 3 share the score-0 floor at the lower goalpost. Provinces beyond the goalposts aren't separated further — that's the trade-off for fixed, year-over-year comparable scoring instead of percentiles.

Top scorers

Rank	Province	Raw value (µg/m³)	Score
1	Phatthalung	11.92	84.6
2	Trang	12.6	83.1
3	Pattani	12.81	82.6
4	Narathiwat	13.2	81.8
5	Si Sa Ket	13.24	81.7

Lowest scorers

Rank	Province	Raw value (µg/m³)	Score
77	Lamphun	77.33	0
76	Mae Hong Son	61.45	0
75	Uttaradit	50.35	0
74	Chiang Mai	47.79	4.9
73	Lampang	45.71	9.5

Show all 77 provinces ranked Sorted highest to lowest score

Rank	Province	Raw value (µg/m³)	Score
1	Phatthalung	11.92	84.6
2	Trang	12.6	83.1
3	Pattani	12.81	82.6
4	Narathiwat	13.2	81.8
5	Si Sa Ket	13.24	81.7
6	Nakhon Si Thammarat	13.91	80.2
7	Yala	14.11	79.8
8	Phangnga	14.69	78.5
9	Krabi	14.77	78.3
10	Phuket	15.43	76.8
11	Ranong	15.82	76
12	Satun	17.09	73.1
13	Chumphon	18.62	69.7
14	Songkhla	18.83	69.3
15	Amnat Charoen	21.39	63.6
16	Khon Kaen	22.05	62.1
17	Rayong	22.14	61.9
18	Buri Ram	22.99	60
19	Roi Et	23.34	59.2
20	Kanchanaburi	23.59	58.7
21	Mukdahan	24.14	57.5
22	Chanthaburi	24.47	56.7
23	Nakhon Pathom	25.42	54.6
24	Sakon Nakhon	25.48	54.5
25	Surat Thani	25.84	53.7
26	Trat	26.29	52.7
27	Yasothon	26.72	51.7
28	Nakhon Ratchasima	26.82	51.5
29	Samut Sakhon	27.19	50.7
30	Prachuap Khiri Khan	27.39	50.3
31	Nong Bua Lam Phu	28.37	48.1
32	Prachin Buri	28.46	47.9
33	Kamphaeng Phet	28.58	47.6
34	Samut Prakan	28.6	47.6
35	Chaiyaphum	28.98	46.7
36	Nakhon Nayok	29.4	45.8
37	Udon Thani	29.51	45.5
38	Bangkok	29.73	45
39	Samut Songkhram	29.92	44.6
40	Sukhothai	30.03	44.4
41	Maha Sarakham	30.23	43.9
42	Tak	30.32	43.7
43	Chon Buri	30.39	43.6
44	Phetchabun	30.76	42.8
45	Kalasin	31.12	42
46	Bueng Kan	31.19	41.8
47	Phetchaburi	31.31	41.5
48	Nakhon Phanom	31.36	41.4
49	Phra Nakhon Si Ayutthaya	31.66	40.8
50	Sa Kaeo	31.8	40.5
51	Saraburi	31.88	40.3
52	Lopburi	32.28	39.4
53	Nonthaburi	32.92	38
54	Chachoengsao	32.98	37.8
55	Surin	33.21	37.3
56	Uthai Thani	33.25	37.2
57	Phayao	34.59	34.2
58	Phichit	34.73	33.9
59	Chiang Rai	35.15	33
60	Nong Khai	35.47	32.3
61	Chai Nat	35.53	32.2
62	Phitsanulok	35.81	31.5
63	Pathum Thani	36.04	31
64	Nakhon Sawan	36.42	30.2
65	Sing Buri	36.62	29.7
66	Loei	37.76	27.2
67	Phrae	38.39	25.8
68	Ubon Ratchathani	38.81	24.9
69	Nan	39.76	22.7
70	Ratchaburi	40.71	20.6
71	Suphan Buri	41.17	19.6
72	Ang Thong	41.87	18.1
73	Lampang	45.71	9.5
74	Chiang Mai	47.79	4.9
75	Uttaradit	50.35	0
76	Mae Hong Son	61.45	0
77	Lamphun	77.33	0

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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