A system, method, and apparatus are provided with features that allow hosts to be alerted of risks to the well-being of their space that may arise, for example, from a breach of contract, violation of local laws, or violation of established property rules. In one example an air analyzer is provided that includes: (1) multiple sensors including one or more of a digital multi-pixel gas sensor, a digital humidity and temperature sensor, or a particulate matter sensor, wherein each of the multiple sensors is configured to obtain a sample of air and derive therefrom an environmental attribute, wherein the environmental attributes provide a signature of the sampled air, and (2) a smoke classifier configured to classify a smoking event by comparing the signature of sampled air to signatures of a classification model.