Children from financially disadvantaged households face 79% higher odds of excess weight, with urban noise exposure adding another 40% increase in risk according to this Geneva-based analysis of over 2,000 youth. The study found daytime and nighttime noise consistently associated with childhood obesity, while air pollution appeared to disproportionately affect lower-income families, though this interaction narrowly missed statistical significance. This research illuminates how environmental stressors may compound socioeconomic health disparities during critical developmental windows. The noise-obesity connection likely operates through chronic stress pathways that disrupt sleep, elevate cortisol, and alter appetite regulation—mechanisms well-established in adult populations but less studied in children. The findings align with emerging evidence that urban environmental quality represents a key pathway through which inequality becomes biologically embedded. However, the cross-sectional design prevents establishing causation, and the study's focus on one Swiss city limits generalizability. As a preprint awaiting peer review, these results require validation, but they suggest that addressing childhood obesity may require coordinated interventions targeting both poverty and environmental quality rather than individual behavior change alone.