2666

Background/Aim: Los Angeles, California is the largest urban oil field in the country and home to thousands of active oil wells in very close proximity to homes, schools and parks, yet little is known about potential health impacts. In this study, we used community-driven methodology to assess respiratory health among community residents living within 500 m of either an active or idle oil well in the Las Cienagas oil field in South Los Angeles. Methods: A cross-sectional community-based study was conducted between January 2017 and August 2019 near two oil wells in the Las Cienagas oil field. We collected acute health symptoms and measured FEV1 (forced expiratory volume in the first second of exhalation) and FVC (forced vital capacity). We related lung function measures to distance and direction from active or idle oil site using generalized linear models adjusted for covariates. Results: A total of 919 residents with valid spirometry measurements living <1000 m from an active or idle oil well were included in this analysis. Adjusting for freeway distance, on average, participants near the active oil site had lower percent predicted FVC (-13.9%, p=0.047) and lower percent predicted FEV1 (-11.6%, p=0.09) as compared to residents near the idle site. Among only residents near the active site, we observed that residents living downwind and <200m from the active well have significantly lower FEV1 (-.42L, p<0.001) compared to residents living upwind after controlling for age, height, race/ethnicity, sex and distance to freeway. Among residents near the idle site, we observed no significant differences based on proximity or direction. Conclusions: Living nearby and downwind of active urban oil drilling sites is associated with lower lung function among residents, which may contribute to environmental health disparities.