Permanent project revision

High-density air-quality monitoring and source-apportionment network

Revision 2026-08-20-source-dates · effective 2026-07-17

Superseded. A later revision exists: 2026-08-27-p1-quality-uplift →

unreviewed

Created the first structured Evidence Passport with 1 claim and 3 source dossiers.

sha256:a8bfc510612087f08291d3f2dc9714f5de5527591fbf1e8c35a538ebb4ebd4ca

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.

1: of 1 claims mapped
3: source dossiers
2: publication dates recorded
1: 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-0fee5bf4980691d2 quantitative

UNEP's independent 2019 review found Beijing's PM2.5 annual mean fell about 35%, from 89.5 to 58 µg/m³, between 2013 and 2017

Published field: impact · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: No support note recorded
Caveat: The entry itself states the reductions reflect the whole clean-air programme — the sensor network enabled targeting rather than causing the fall alone.

Sources carrying this claim

UNEP — A Review of 20 Years' Air Pollution Control in Beijing (independent)

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-source-dates effective 2026-07-17 · created 2026-08-20

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

sha256:a8bfc510612087f08291d3f2dc9714f5de5527591fbf1e8c35a538ebb4ebd4ca

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

1: of 1 claims mapped
3: source dossiers
2: publication dates recorded
1: archives linked
0: exact locators
0: content captures hashed

Governance facts carried by the record

Operator: Beijing Ecology and Environment Bureau
Actor types: city-government
Funding model: Not recorded
Funding description: Not recorded
Cost: Not recorded
Ownership: Not recorded
Decision rights: Not recorded
Exit conditions: Not recorded

3 source dossiers

UNEP — A Review of 20 Years' Air Pollution Control in Beijing (independent) unep.org · 1 linked claim

Open original source ↗

Stable source ID: src-89d5da7d0e10b635
Publisher: Name not classified · unep.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: 2026-07-17
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: Open archived copy ↗ · 2026-01-19
Content hash: No captured content hash
Locator: Open the recorded source note
Independent review; source for monitoring build-out and the ~35% PM2.5 decline 2013-2017.
Descriptive only — not page/paragraph exact
Claims linked: clm-0fee5bf4980691d2

ICLEI — Clearing the skies (independent) sustainablemobility.iclei.org · background

Open original source ↗

Stable source ID: src-ec7e146ac8042367
Publisher: Name not classified · sustainablemobility.iclei.org
Type / language: web-page · language not classified
Published: 2023-09-01
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-17
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Independent description of the integrated network (reference stations, 1,000+ sensors, satellite, lidar).
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

Climate & Clean Air Coalition (independent) ccacoalition.org · background

Open original source ↗

Stable source ID: src-3f3768226a3bbd4d
Publisher: Name not classified · ccacoalition.org
Type / language: web-page · language not classified
Published: 2019-03-09
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-17
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Independent (CCAC) coverage of the monitoring/source-apportionment approach and results.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

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.