Even after one of the largest environmental remediation efforts in California history, dangerous levels of lead persist in residential neighborhoods surrounding a former battery smelter in Southeast Los Angeles, according to a new study from the University of California, Irvine's Joe C. Wen School of Population & Public Health. The research is published in the journal Environmental Science & Technology. The findings reveal a serious public health failure while also highlighting the power of community-driven research to hold institutions accountable and drive meaningful change.