Exposure becomes conceptually imprecise when residence, movement and encounter are treated as interchangeable. Reviewing twenty studies, Liu and colleagues propose daily greenness exposure as a frame for comparing ways in which greenery is measured in relation to mobility and health. Their typology distinguishes ecological momentary, effect-oriented and spatiotemporal assessments, while recognising moderation, mediation, independence and undifferentiated associations in the observed relationships. This is not a new universal dose; it is a classification of the operations by which environmental contact becomes measurable. A satellite-derived residential greenness score and a momentary report during a journey may refer to the same person without referring to the same event. Their temporalities, spatial boundaries and inferential claims differ. By joining mobility studies, environmental measurement, landscape research and public health, the article provides a useful vocabulary for preventing a substitution that frequently passes unnoticed: the replacement of a moving subject’s situated exposures with static attributes of a location. Its most durable lesson concerns methodological provenance, not the positive value of greenery in the abstract.