The standards, and what they actually require.
Explainers on the duties, standards and data behind air quality, road condition and building performance. Written from primary sources, and straight about the edge of what any of it can tell you — including ours.
- Road condition
What PAS 2161 means for road condition data
What PAS 2161:2024 requires, when it applies, which technologies are approved, and what non-accredited road condition data can and cannot be used for.
Last reviewed 12 August 2026
- Air quality
What a diffusion tube network can and can't tell you
What NO2 diffusion tubes measure, what LAQM requires, and what a network of fixed points can and cannot tell you about the ground between them.
Last reviewed 12 August 2026
- Method
Provenance: how to audit an environmental sensor reading
The questions to ask any supplier before you cite their environmental data: instrument, timing, calibration chain, uncertainty, operating envelope, and reproducibility.
Last reviewed 12 August 2026
- Air quality
MCERTS and indicative sensors: what your air quality data is admissible for
What UK reference, MCERTS-indicative and uncertified sensor data can legitimately be used for under LAQM — and what it cannot.
Last reviewed 12 August 2026
- Building performance
Modelled versus measured: the housing energy performance gap
What SAP and RdSAP actually model, what RdSAP 10 changed, and what measured studies show about the gap between EPC ratings and real energy use.
Last reviewed 12 August 2026
- Road condition
The unclassified road blind spot
Unclassified roads are about 62% of England's local network and the least systematically surveyed. What the data actually covers, and why.
Last reviewed 12 August 2026
- Cornwall
Air quality in Cornwall: the AQMAs, the monitoring and the 2026–2031 action plan
Cornwall has three Air Quality Management Areas: Tideford, Gunnislake, Launceston. Six were revoked in 2024-25. Where the data and the draft plan stand.
Last reviewed 12 August 2026
Every page here names what Make Sense cannot do as plainly as what it is building. That is the point of them.