Data quality and QA/QC
QA/QC checklist
Complete this for every reporting year, in inventory/<year>/qaqc-checklist.md.
- Every entity in the boundary register has data, or a documented reason why not
- Every significant source has activity data for all 12 months
- Units are consistent; conversions have been checked
- Emission factors match the register and are for the right year and geography
- Estimates are flagged and their method is documented
- Year-on-year change is over ±10% for a source → explained
- Totals reconcile: source → category → inventory
- Double counting checked (for example, fleet fuel cards against expense claims)
- Category 2 reported location-based and market-based
- Biogenic CO₂ reported separately
- Sampled calculations recalculated by hand (at least 10%)
- Internal reviewer sign-off recorded
Evidence index
Every activity-data row must point to evidence (evidence_id). The index
(inventory/<year>/evidence-index.csv) records:
- evidence ID
- description, such as "British Gas invoice Jan 2025, Site A"
- where it is stored (path or link in the document store)
- who provided it, and when
Verifiers sample from this index. A broken link is a finding.