Permanent project revision

Breathe Accra: One Air Sensor per Municipal Assembly

Revision 2026-08-20-source-dates · effective 2026-08-01

Current revision. This is the snapshot used by the live entity page.

unreviewed

Created the first structured Evidence Passport with 1 claim and 6 source dossiers.

sha256:02aacca506206409bf29827840641f882f140fa5ab74bc40edf4e5d97e0f6ab0

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
6: source dossiers
4: 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-bb9cf60f5b32d41f quantitative

A peer-reviewed colocation study in Accra put the EPA's low-cost network at a daily average PM2.5 of 23.4 ug/m3 over 2018-2021, 1.6 times the WHO daily guideline of 15, across 11,001 valid days.

Published field: impact · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The entry names this colocation study as the peer-reviewed source that measured the network average against a reference Teledyne T640 instrument.
Caveat: The same study found the Clarity Node-S used here the least accurate of three brands, with a mean absolute error of 13.68 ug/m3 before correction.

Sources carrying this claim

Environ. Sci. Technol. (2023) - Low-cost sensor intercomparison, correction factors and 2+ years of PM2.5 monitoring in Accra

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 2026-08-01 · created 2026-08-20

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

sha256:02aacca506206409bf29827840641f882f140fa5ab74bc40edf4e5d97e0f6ab0

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

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

Governance facts carried by the record

Operator: Breathe Accra / GhanaAQ (University of Cape Coast) with Greater Accra municipal assemblies and Ghana EPA
Actor types: research, city-government, national-government
Funding model: grant
Funding description: Clean Air Fund; Breathe Cities
Cost: Not recorded
Ownership: Not recorded
Decision rights: Not recorded
Exit conditions: Not recorded

6 source dossiers

Clarity - Breathe Accra: continuous urban air quality monitoring clarity.io · background

Open original source ↗

Stable source ID: src-44e8f0ee0e95937f
Publisher: Name not classified · clarity.io
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-08-01
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
Vendor and operator account: led by Prof. Kofi Amegah's team at the University of Cape Coast under the GhanaAQ project (started 2019), network deployed early 2022, 15 Clarity Node-S sensors, one per municipal assembly, partners include Ghana EPA and Ghana Health Service, funded by the Clean Air Fund.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

MyJoyOnline - Municipal assemblies gain real-time pollution data as Breathe Accra expands (30 May 2026) myjoyonline.com · background

Open original source ↗

Stable source ID: src-c0978da74d4ce317
Publisher: Name not classified · myjoyonline.com
Type / language: web-page · language not classified
Published: 2026-05-30
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-08-01
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
Phase two: thirteen municipal assemblies each get three more sensors, taking Accra past fifty; funding from Breathe Cities. An assembly officer names the intended lever - open-burning bylaws, prosecuted in court. The article's claim to be the sub-region's largest such network is not independently verified and is not repeated here.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

Environ. Sci. Technol. (2023) - Low-cost sensor intercomparison, correction factors and 2+ years of PM2.5 monitoring in Accra pmc.ncbi.nlm.nih.gov · 1 linked claim

Open original source ↗

Stable source ID: src-6e8331f3522a8530
Publisher: Name not classified · pmc.ncbi.nlm.nih.gov
Type / language: web-page · language not classified
Published: 2023-03-22
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-08-01
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: Open archived copy ↗ · 2025-02-04
Content hash: No captured content hash
Locator: Open the recorded source note
Peer-reviewed. Ghana EPA deployed 17 Clarity Node-S Gen I across Accra from May 2018; network daily mean PM2.5 23.4 ug/m3 (1.6x the WHO daily guideline) over 11,001 valid days; colocation against a reference Teledyne T640 found Clarity Node-S the least accurate of three brands (MAE 13.68 ug/m3) before correction.
Descriptive only — not page/paragraph exact
Claims linked: clm-bb9cf60f5b32d41f

EPA Ghana - Air Quality Portal aqi-gh.org · background

Open original source ↗

Stable source ID: src-cb1fd0a135cb9ebc
Publisher: Name not classified · aqi-gh.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: 2026-08-01
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
The regulator's public real-time portal (Accra station shown: Achimota Interchange), with a six-band AQI scale and Ghana's standards of 35 ug/m3 PM2.5 and 70 ug/m3 PM10. Verified loading 1 Aug 2026. Compliance standards, not automatic triggers.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

Ghana News Agency - Air quality management regulations passed into law (Sept 2025) gna.org.gh · background

Open original source ↗

Stable source ID: src-1024a67d2d38d818
Publisher: Name not classified · gna.org.gh
Type / language: web-page · language not classified
Published: 2025-09-06
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-08-01
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
Environmental Protection (Air Quality Management) Regulations, 2025 (LI 2507): industry must install pollution controls and monitor emissions, and an Air Quality Information Management System is required. No ambient index threshold with an automatic consequence is described.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

EPIC / University of Chicago - How air quality data is driving policy action in Ghana climate.uchicago.edu · background

Open original source ↗

Stable source ID: src-bec5f21f40e9235d
Publisher: Name not classified · climate.uchicago.edu
Type / language: web-page · language not classified
Published: 2026-04-09
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-08-01
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
Funder account, independent of Breathe Accra. Confirms LI 2507 and the revision of national standards; its own monitoring grant built a hybrid network in Tema, not Accra - kept out of this entry.
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.