A landlord air quality programme does not need to measure everything. It needs to measure the things that turn a "he-said-she-said" damp dispute into a documented record — and that increasingly satisfy Awaab's Law statutory deadlines.
The four channels that matter most.
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Relative humidity — the mould gauge. 30–60% RH room average. Sustained above 60% is a watch; above 70% is action.
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Temperature — both comfort and dew-point input. Below 16 °C significantly raises condensation risk on cold walls. Above 24 °C raises summer humidity.
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CO₂ — the ventilation gauge. A property regularly above 1,500 ppm shows poor ventilation behaviour, which feeds the humidity problem.
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Dew-point (derived from RH + T) — the real predictor of surface condensation. When dew-point is within 2 °C of the coldest wall surface, condensation is imminent.
Where to place the device.
For single-device deployments, prioritise the bathroom or the most damp-prone bedroom. Bathrooms reveal extractor performance; bedrooms reveal sleeping-occupancy ventilation. North-facing rooms with exterior walls are the typical mould-onset locations.
For multi-device deployments (2–4 per property), add: kitchen (cooking moisture), living room (whole-property baseline), and the most-cold room (dew-point risk).
What the data tells you.
A 30-day baseline reveals patterns:
- A bathroom that recovers to under 60% RH within 30 minutes of a shower has working extraction.
- A bedroom that climbs from 45% to 80% RH overnight has a tenant breathing into a closed room with no ventilation — a behavioural fix.
- A kitchen that stays above 65% RH for hours after cooking has an underperforming extractor — a maintenance fix.
- A north-facing bedroom with dew-point within 2 °C of the wall temperature has a structural problem — an insulation or MVHR retrofit job.
The data trail.
Per-property monthly reports go to the agent. Tenant-safe summary links go to the tenant. CSV export goes to the property file. The Envora Fleet audit log preserves device install and reading continuity for use as dispute evidence.
For social landlords specifically: continuous data dramatically simplifies meeting Awaab's Law statutory deadlines — most of the "investigate and respond" obligations are easy when the data has been continuously logged.