The proposed study will evaluate the effectiveness of a health-focused community program transitioning low-income and health-vulnerable populations from gas to induction cooking, aiming to reduce exposure to household air pollution. The study will conduct exposure assessments, build a comprehensive database of personal and kitchen air pollutant concentrations, and apply a rigorous stepped-wedge design across 300 homes. It will provide detailed exposure estimates linked to cooking behaviors and assess how ventilation practices affect exposure, with a focus on children, the most vulnerable to pollutants. This research will expand environmental risk characterization by measuring a wide range of pollutants, including nitrogen dioxide (NO2), fine particulate matter (PM2.5) (including elemental composition), and Benzene, Toluene, Ethylbenzene, and Xylene (BTEX) compounds. The overall goal of this study is to provide an empirical basis for guiding future intervention policies such as building ventilation and electrification in California. Informing these programmatic actions with sound scientific evidence will be critical to minimize exposure for California residents, and especially critical for energy-poor and vulnerable populations.