Permanent project revision

Bangkok PM2.5 Monitoring & Graduated Response

Revision 2026-08-20-claim-baseline · effective 2026-07-26

Superseded. A later revision exists: 2026-08-21-source-dates →

unreviewed

Created the first structured Evidence Passport with 9 claims and 10 source dossiers.

sha256:ba85df3261f08a6c5cb855be38d49e722fc2c77e6edc05b2aa91b6bac3caf023

All revisions → Current entity page →

Change set

add /evidencePassport — Added claim-level evidence mapping and source dossiers.
add /revisionHistory — Established a permanent, hash-addressed baseline revision.

9: of 9 claims mapped
10: source dossiers
0: publication dates recorded
0: archives linked
0: exact locators
0: content captures hashed

Claims, one by one

The text below is copied verbatim from the published record. Each claim names the source dossiers that carry it; caveats stay attached to the claim they qualify.

Claim 1 clm-747135a8bf62c677 quantitative

Bangkok's city government publishes readings from 523 monitoring points, 70 of them fixed stations

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The city's own page gives 523 air-quality monitoring points citywide, of which 70 are fixed monitoring stations, and distinguishes reference-grade instruments from portable devices.
Caveat: No claim-specific caveat recorded

Sources carrying this claim

Greener Bangkok — air quality monitoring stations

Claim 2 clm-3932e79aec8c60e1 quantitative

colours every district against the national index tightened in June 2023: orange above 37.5 micrograms, red above 75.1

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: Thailand's revised air quality index, announced in the Royal Gazette, lowered the red band to 75.1 micrograms per cubic metre with effect from 1 June 2023.
Caveat: No claim-specific caveat recorded

Sources carrying this claim

Pollution Control Department — revised national air quality index

Claim 3 clm-2b15ec6222fd51bf quantitative

On 24 January 2025 the city closed 352 of its 437 schools

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The agency report records 352 of 437 city schools closed on 24 January 2025 — the most in five years, with more than 250 closed the previous day — as PM2.5 reached 108 micrograms per cubic metre.
Caveat: No claim-specific caveat recorded

Sources carrying this claim

AFP via Phys.org — Bangkok closes schools over air pollution

Claim 4 clm-ac6f842e62438476 descriptive

trucks not on a pre-registered Green List were barred from nine inner districts

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: Unregistered six-wheel and larger vehicles were barred on 23-24 January 2025 from nine districts inside the Ratchadaphisek ring road plus 13 outer districts. The governor states that the city has no authority over traffic and enforces the ban under the Disaster Prevention and Mitigation Act, triggered by the red level of 75 micrograms in five districts.
Caveat: The Bangkok Post page blocks automated fetching; headline and content were confirmed via search. The borrowed legal basis is the point: the lever is disaster law, not traffic law.

Sources carrying this claim

Nation Thailand — polluting trucks barred from inner Bangkok
Bangkok Post — the legal basis for the truck ban

Claim 5 clm-56175448ce8d2a4d quantitative

the national government made trains and buses free for a week for 140 million baht

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The official announcement covers free public transport from 25 to 31 January 2025 with 140 million baht allocated to compensate rail and bus operators, ordered by the national government rather than the city.
Caveat: A university environmental academic calls the free-fare week a waste of money that does not change car users' behaviour; that page also blocks automated fetching and was confirmed via search.

Sources carrying this claim

Government Public Relations Department — seven days of free public transport
Bangkok Post — free public transport plan under fire

Claim 6 clm-c8d5da22e83c4b14 descriptive

Employer work-from-home stays voluntary

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The official page describes a voluntary network: employers register online, and the city alerts them when PM2.5 exceeds 75 micrograms per cubic metre for three consecutive days.
Caveat: Enrolment figures differ between the city page and press copy, so none is used.

Sources carrying this claim

Greener Bangkok — the work-from-home network

Claim 7 clm-980f6c9521ab750c quantitative

a peer-reviewed model traces roughly 30% of the region's haze-season PM2.5 to burning outside Thailand

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The chemical-transport source attribution for the Bangkok metropolitan region puts foreign biomass burning at about 30 per cent, with inflow across the model boundary rising from about 30 per cent in February to around 50 per cent in March and April.
Caveat: A separate study using the same model family finds domestic industry and transport dominant, so the figure is attributed to this model rather than asserted.

Sources carrying this claim

Source attribution and health burden of PM2.5 in mainland Thailand (peer-reviewed)

Claim 8 clm-7e1c6d84be1f80a7 quantitative

The city reported that its 23-24 January 2025 low-emission-zone pilot inside the Ratchadaphisek ring road kept 404 trucks a day out of the zone and left PM2.5 15.6% below surrounding areas. Enforcement was thin: 1,547 recorded violations produced 28 fines

Published field: impact · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The plan presented on 19 December 2025 for 50 districts carries the pilot results: 404 fewer trucks a day, 15.6 per cent lower PM2.5, 1,547 violations and 28 fines, alongside 57,936 Green List registrations and the trigger thresholds and ventilation-rate condition.
Caveat: City-reported pilot figures over two days, presented in support of an expansion plan.

Sources carrying this claim

Nation Thailand — low-emission zone plan for fiscal 2026

Claim 9 clm-db28a5e8cc036c74 descriptive

Bangkok can close its own schools outright and, borrowing disaster-law powers, turn lorries back, but it can only ask employers to send staff home, and it cannot reach the burning upwind

Published field: lesson · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: Four levers of visibly different strength: the city closed 352 of its own 437 schools by its own decision; it enforced the truck ban only by borrowing powers under the Disaster Prevention and Mitigation Act, the governor stating the city has no authority over traffic; the work-from-home network is registration-based and advisory; and roughly 30 per cent of haze-season PM2.5 in the region is modelled as arriving from outside the country.
Caveat: No claim-specific caveat recorded

Sources carrying this claim

AFP via Phys.org — Bangkok closes schools over air pollution
Bangkok Post — the legal basis for the truck ban
Greener Bangkok — the work-from-home network
Source attribution and health burden of PM2.5 in mainland Thailand (peer-reviewed)

Source dossiers and revision state

This layer records what is known about each source, what is still missing, and the exact snapshot this page is rendering. A missing date, archive or hash stays visible as missing.

unreviewed Revision 2026-08-20-claim-baseline effective 2026-07-26 · created 2026-08-21

Awaiting operator and domain-expert review; publication of this revision implies neither.

sha256:ba85df3261f08a6c5cb855be38d49e722fc2c77e6edc05b2aa91b6bac3caf023

Revision history → Permanent version link → Machine-readable record → Evidence Constitution →

9: of 9 claims mapped
10: source dossiers
0: publication dates recorded
0: archives linked
0: exact locators
0: content captures hashed

Governance facts carried by the record

Operator: Bangkok Metropolitan Administration (Environment Department)
Actor types: city-government
Funding model: public
Funding description: City budget; the January 2025 free-transit week was paid separately by the national government (140 million baht)
Cost: Not recorded
Ownership: Not recorded
Decision rights: Not recorded
Exit conditions: Not recorded

10 source dossiers

Greener Bangkok — air quality monitoring stations greener.bangkok.go.th · 1 linked claim

Open original source ↗

Stable source ID: src-155e13f7db2824c2
Publisher: Name not classified · greener.bangkok.go.th
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-21
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
The city's own page: 523 air-quality monitoring points citywide, of which 70 are fixed monitoring stations; distinguishes reference-grade instruments from portable devices.
Descriptive only — not page/paragraph exact
Claims linked: clm-747135a8bf62c677

Greener Bangkok — the work-from-home network greener.bangkok.go.th · 2 linked claims

Open original source ↗

Stable source ID: src-b13aa042335c4b8b
Publisher: Name not classified · greener.bangkok.go.th
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-21
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Official page for the voluntary work-from-home network: employers register online, and the city alerts them when PM2.5 exceeds 75 micrograms per cubic metre for three consecutive days. Enrolment figures differ between the city page and press copy, so none is used.
Descriptive only — not page/paragraph exact
Claims linked: clm-c8d5da22e83c4b14
clm-db28a5e8cc036c74

Pollution Control Department — revised national air quality index pcd.go.th · 1 linked claim

Open original source ↗

Stable source ID: src-ffa194ad11806903
Publisher: Name not classified · pcd.go.th
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-21
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Announcement of Thailand's revised air quality index in the Royal Gazette, lowering the red band to 75.1 micrograms per cubic metre, effective 1 June 2023.
Descriptive only — not page/paragraph exact
Claims linked: clm-3932e79aec8c60e1

AFP via Phys.org — Bangkok closes schools over air pollution phys.org · 2 linked claims

Open original source ↗

Stable source ID: src-337e69b349709542
Publisher: Name not classified · phys.org
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-21
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
352 of 437 city schools closed on 24 January 2025, the most in five years, with more than 250 closed the previous day; PM2.5 reached 108 micrograms per cubic metre.
Descriptive only — not page/paragraph exact
Claims linked: clm-2b15ec6222fd51bf
clm-db28a5e8cc036c74

Nation Thailand — polluting trucks barred from inner Bangkok nationthailand.com · 1 linked claim

Open original source ↗

Stable source ID: src-dcfb2c71d4bd9fb2
Publisher: Name not classified · nationthailand.com
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-21
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Dates and geography of the truck ban: unregistered six-wheel and larger vehicles barred on 23-24 January 2025 from nine districts inside the Ratchadaphisek ring road plus 13 outer districts.
Descriptive only — not page/paragraph exact
Claims linked: clm-ac6f842e62438476

Nation Thailand — low-emission zone plan for fiscal 2026 nationthailand.com · 1 linked claim

Open original source ↗

Stable source ID: src-324ab1566613262f
Publisher: Name not classified · nationthailand.com
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-21
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Plan presented 19 December 2025 for 50 districts; the trigger thresholds and ventilation-rate condition; 57,936 Green List registrations; and the pilot results of 404 fewer trucks a day, 15.6% lower PM2.5, 1,547 violations and 28 fines.
Descriptive only — not page/paragraph exact
Claims linked: clm-7e1c6d84be1f80a7

Bangkok Post — the legal basis for the truck ban bangkokpost.com · 2 linked claims

Open original source ↗

Stable source ID: src-4631389c10cc0bfc
Publisher: Name not classified · bangkokpost.com
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-21
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
The governor states the city has no authority over traffic and will enforce the truck ban under the Disaster Prevention and Mitigation Act, triggered by the red level of 75 micrograms in five districts. Site blocks automated fetching; headline and content confirmed via search.
Descriptive only — not page/paragraph exact
Claims linked: clm-ac6f842e62438476
clm-db28a5e8cc036c74

Government Public Relations Department — seven days of free public transport thailand.prd.go.th · 1 linked claim

Open original source ↗

Stable source ID: src-debdf84ab03bc6a1
Publisher: Name not classified · thailand.prd.go.th
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-21
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Official announcement of free public transport from 25 to 31 January 2025, with 140 million baht allocated to compensate rail and bus operators. Ordered by the national government, not the city.
Descriptive only — not page/paragraph exact
Claims linked: clm-56175448ce8d2a4d

Bangkok Post — free public transport plan under fire bangkokpost.com · 1 linked claim

Open original source ↗

Stable source ID: src-93ae977a022073cd
Publisher: Name not classified · bangkokpost.com
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-21
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Counterweight: a Chulalongkorn University environmental academic calls the 140-million-baht free-fare week a waste of money that does not change car users' behaviour. Site blocks automated fetching; content confirmed via search.
Descriptive only — not page/paragraph exact
Claims linked: clm-56175448ce8d2a4d

Source attribution and health burden of PM2.5 in mainland Thailand (peer-reviewed) pmc.ncbi.nlm.nih.gov · 2 linked claims

Open original source ↗

Stable source ID: src-c3843003beaba62b
Publisher: Name not classified · pmc.ncbi.nlm.nih.gov
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-21
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Chemical-transport source attribution for the Bangkok metropolitan region: foreign biomass burning contributes about 30%, and inflow across the model boundary rises from about 30% in February to around 50% in March and April. A separate study using the same model family finds domestic industry and transport dominant, so the figure is attributed to this model rather than asserted.
Descriptive only — not page/paragraph exact
Claims linked: clm-980f6c9521ab750c
clm-db28a5e8cc036c74

Known limits of this passport

Publisher names and source languages have not yet been classified; domains are recorded without guessing.
Existing source notes are descriptive locators, not page- or paragraph-exact citations.
A missing archive, publication date or content hash is shown as null rather than inferred.
The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim.