The Centers for Disease Control and Prevention last week released a mapping tool that allows users to view the prevalence of certain chronic conditions, behaviors and risk factors that have a substantial effect on people’s health for 500 of the nation’s largest cities. The application is part of the 500 Cities Project, a partnership with the CDC Foundation and Robert Wood Johnson Foundation. “Having the ability to report and map health data at city and neighborhood levels is a game changer for public health,” said Wayne Giles, M.D., director of CDC’s Division for Heart Disease and Stroke Prevention. “Local level data available through the 500 Cities website provide health information to better inform and target strategies that are proven to work in improving health.”