Telefonica's big data unit, LUCA, combined cell phone data and open data from weather stations, air quality, and traffic sensors to analyze the air quality and predict traffic in certain locations in Sao Paolo, Brazil. Telefonica provided the insights to the municipality officials, intending to help policymakers better understand the correlation between population mobility in the Sao Paolo and air quality, so that the policymakers can create an evidence-based intervention to solve these problems.