Pollution Statistics (IMAGE) King's College London Caption For the first time, a joint air pollution study across two mega-cities -- London and Paris -- measures the impact of policies designed to reduce air pollution from urban traffic over the last 12 years. Credit King's College London and Airparif Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.