ASSESSMENT UNAVAILABLE
No England-wide current environmental assessment is published because the governed monitoring coverage and freshness gate was not met.
The station-level PM2.5 operational screen is reported separately and cannot override the governed England-wide coverage/freshness gate.
Evidence acquisition: PASSED. 11 configured joins remain pending or blocked. The PM2.5 operational screen and England-wide current assessment are distinct from the 30-day England AURN review. Screening evidence only; no source attribution, legal or health finding.
Primary evidence product · England 30-day official monitoring review
National coverage criteria met
What England's monitoring data showed
This Air Quality Project analysed 9,405 valid pollutant-day observations across 4,176 unique station-days from 141 reporting stations, covering 9 of 9 English regions between 2026-07-30 and 2026-08-28.
Descriptive pollutant findings
These are measured 30-day station and regional patterns. They are not source-attribution, exposure, health or legal-compliance findings.
Northampton Spring Park · East Midlands · 26 valid days
Highest eligible regional median: London (5.19 µg/m³).
WHO-context pollutant-day observations: 28
Maidstone Upper Stone Street · South East · 30 valid days
Highest eligible regional median: London (12.48 µg/m³).
WHO-context pollutant-day observations: 2
Luton A505 Roadside · East of England · 28 valid days
Highest eligible regional median: East of England (12.54 µg/m³).
WHO-context pollutant-day observations: 180
Interpretation boundary: provisional official monitoring evidence; WHO guideline comparisons are contextual and are not UK legal exceedance counts.
Evidence pathways for science, public health, policy, journalism and communities
This Air Quality Project separates the successful England 30-day review from the current live episode screen and provides routes to data, methods, provenance, corrections and external review.
Use the evidence External review pack Contact and corrections
9/9 regions · 141/142 stations · 9,405 pollutant-day observations across 4,176 unique station-days · 95.0% completeness.
Current data service
Live monitoring active across 128 fresh sites
228 of 239 time series were inside the freshness window and 0 preliminary screening observation(s) were selected for follow-up.
Measurement coverage
Fresh physical monitoring sites128 / 134
Selected monitoring locations inside the evidenced geography and freshness window · 96%
Fresh PM time series228 / 239
PM2.5 and PM10 streams with recent usable observations · 95%
Operational PM2.5 screening snapshot
The screen compares eligible PM2.5 assessments with a short recent-history window. Formal false-discovery-rate control has not been established. A candidate is a review prompt, not a legal exceedance, source finding or health determination.
Official monitoring network
171 active AURN sites discovered across England
The public review distinguishes active sites, configured pollutant streams, reporting stations and station-day completeness. Monitoring evidence is shown separately from the supplementary context layer.
Explore station and regional results Open monitoring and context map
How this review now works
Official monitoring data leads. No location-specific follow-up was activated.
The England-wide monitoring screen runs first. Because no fresh screening event fixed a time window and geographic footprint, no location-specific context was queried or promoted into the active review.
Target-neutrality preserved · no post-discovery context query activated. Proximity and register matches remain context only and cannot establish contribution.
Current measurements
Inspect official PM2.5 and PM10 coverage, data-quality exclusions, screening observations and cross-source execution in one public dashboard.
Explore current statusWeekly evidence briefing
Read a public summary organised around what changed, what was checked, what remains uncertain and what evidence is required next.
Read the weekly briefingMethod and provenance
Review acquisition, quality control, statistical screening, evidence linkage and hard claim boundaries in reproducible detail.
Review methodsForensic scientific evidence review
Inspect evidence coverage, freshness, source maturity, executed cross-references, uncertainty and explicit non-conclusions.
AI and model assurance
Review current deterministic execution, prohibited automated uses, evaluation gates and model provenance.
Scientific evidence and software assurance are different
Scientific evidence
Measurements, station and regional coverage, descriptive calculations, source records and stated limitations are the evidence available for review.
Engineering assurance
Automated checks confirm that the pipeline followed its declared rules. They do not constitute peer review, accreditation, regulatory approval or institutional endorsement.
Operational PM2.5 screening interpretation
Adjusted PM2.5 candidate count: 0; eligible station assessments: 120; not eligible or not assessed: 8. A count of zero means only that no eligible assessment crossed every current operational criterion. It does not establish absence of pollution, harmless concentrations, assessment of every station or screening of all pollutants.
Formal false-discovery-rate control has not been established. The live screen does not identify a source and is not a health assessment or regulatory determination.