<b>Decoding Olfactory Sensor Degradation Mechanisms in Harsh Industrial Ecosystems An Explanatory IoT Reliability Framework</b>

What it lacks is an explanation of degradation that connects the physical mechanism to the inferential consequence. Compensation methods are validated by an accuracy metric computed on labelled reference data, which means they are evaluated on their ability to recover a known mapping rather than on their effect upon the meaning of a measurement made after the mapping has moved.

This article develops an explanatory framework that reconstitutes sensor degradation as the progressive invalidation of an observation's declared contract : the sensor continues to report, but the terms under which its report may be relied upon have silently expired. We distinguish three strata physico-chemical alteration, operational and environmental influence, and instrumental-network reliability and show that their signatures converge on two outcomes that compensation practice does not address.