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What the picker changes
  • Top topics digest — the cards score the selected period against the prior 4 weeks.
  • 12-week heatmap & outlet matrix — show the 12 weeks ending at the selected week (they slide back with the picker, they aren’t a fixed snapshot).
  • Per-topic volume / alias drift — same 12-week trailing window, anchored on the selected period.
  • Coverage gap quadrant — scores the selected period against the 12 weeks before it (not including it).
  • Anomaly cards — only show alerts the detector fired during the selected period. Quiet weeks legitimately show none.
What stays as-is
  • Outlet orientation strip / lean colours — context-only, drawn from the last 12 weeks of activity regardless.
  • Co-occurrence graph — recent-activity anchored, not picker-driven.
  • Source & topic profiles — all-time data for the topic; the picker doesn’t affect them.
Rolling 7 days is a sliding live window for “current vibes”; switch to Weekly to compare specific weeks side-by-side.
Weekly Rolling 7 days
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Press topic

Unknown Chemical In Drains

3 articles · 2 aliases in press · peaked week of 19 Jul 2026 · first seen 21 Jul 2026

an unidentified chemical entering municipal drainage systems and causing a fuel-like odor

The stories behind this signal

across press, releases & commentary · links open at the source
News Tuakau residents evacuated after unknown chemical enters drains, smell detected NZ Herald · 21 JulRead ↗ News ‘Completely avoidable’: Commercial site suspected after mystery chemical triggers Tuakau evacuations Stuff · 21 JulRead ↗ News Evacuations in Tūākau after 'unknown chemical' enters drains 1News (TVNZ) · 21 JulRead ↗

Sample framings

Up to 12 framings across outlets and orientations — each a short phrase the extractor generated to characterise the piece's editorial angle (not a quote). Filter by lean to see how each bloc is spinning the story; click through to read the original.

tvnz Centre

hazardous substance detected in urban drainage

Evacuations in Tūākau after 'unknown chemical' enters drains
21 Jul
stuff Centre-left

unidentified hazardous substance detected

‘Completely avoidable’: Commercial site suspected after mystery chemical triggers Tuakau evacuations
21 Jul
+1 more framing Create a free account to see them all →

Coverage by outlet lean Methodology →

Stacked weekly counts; colour by editorial lean. Stuff and The Spinoff lean centre-left, NZ Herald centre-right, others centre.

Alias drift

How press outlets have named this topic, week by week.

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Recent headlines

Most recent 3 articles linking to this topic.

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